under vacuum the valve will stay open,and discharge air.. not suck in air... the turbo is sitll spinning,and creating positive pressure... just not enough to over come the vacuum. i dont understand what people thing bov's suck in air at idle or in vacuum.. for that to happen the turbo it self would be spinning backwards... use your brains people.. think how things work before you post
Hmm, the BOV is discharging air at idle, and yet the engine is still under vacuum during idle and not boost. Seems to me that you have a leaky BOV because all of that air should be sucking through the throttle body during vacuum, and discharged only when boost pressure is being realized....
Only a BMW owner would ask a question this dumb. Try building ur own car or at least learning how the fuck shit works instead of just putting a bov on cause it sounds cool....
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Try leaving the paper infront of it when you come OFF the throttle and you'll see it sucking in air and if you creep the throttle like that the turbo will barely be spinning if at all. Boot it.
It only takes a little intelligence to work out that the spring in a BOV can only compress and make it's sound when the air flowing through it changes direction, think about it.
What you've done is installed an air leak and that's why the engine is vibrating. You must recirculate the air.
@ImHereToAnnoyYou Err yes. When you come OFF the throttle that means the throttle plate will CLOSE while the turbo is still spinning at high rpm. In other words pressure inside the intake pipe will build up therefore a sharp burst of air will be released out from the bov, not the other way...remember pressure goes from high to low. The only time that bov will suck in air is in the instant when you stomp on the gas while in low rpms however the bov will quickly close..
@Triple88a Err that's what I'm saying, the throttle closes, the gas is vented. However once expelled it leaves behind a VACUUM in the pipe which will cause air to be sucked in and thus the bit of paper, however he moves it away so you can't see it.
That BOV will suck in air from the atmosphere every time you come off the throttle, it will suck in whatever air is around, not directly into the engine, but into the intake pipe between the inlet manifold and the turbo, and therefore then the engine
@ImHereToAnnoyYou It wouldn't leave a vacuum as the velocity is not that high, also the turbo does not stop spinning. If the air in the intake was going 200 mph and the turbo just stopped spinning the instant you release the gas, there would be some vacuum by the turbo but in real life that is not the case. Your turbo lag theory falls short on 2 occasions. 1st is If the turbo never stops, there is no lag. 2nd is recirculated air is not forced into the turbo so its no different than VTA.
@Triple88a No it's not a theory, it's the facts. I never said the turbo stops spinning, I said lag will increase.
I don't think you've realised that turbos run off exhaust gases and off boost the engine will be running a vacuum so if you install a leak it will draw air in to equalise the pressure
Haven't you seen a boost gauge? The following clip clearly shows the -ve vacuum and +ve boost readouts for this exact car, you can see it goes into vacuum between gear changes too > watch?v=woGrgQOf4t8
@ImHereToAnnoyYou I'm a running a DIY turbo on my vehicle with a standalone... i know more than you think. It goes in vacuum between gear changes because the boost gauge measure the manifold pressure which is suppose to be in vac as the throttle body is closed. Gotta know ur facts not just guess and call them facts.
@Triple88a Do you think an engine can run without air? No it can't, so when we talk about the throttle being 'closed', it doesn't mean the engine actually stops taking in air and fuel, It just takes much less. Similarly it doesn't stop pumping out exhaust gas as you suggest, that would be silly.
This is why as I stated in my first comment; he takes the paper away because you would see it suck in air, that is a fact. BOVs are usually connected up to a vac line as you should know if you have one.
@ImHereToAnnoyYou No an engine cannot run without air nor fuel obviously it does however decelerate without squirting fuel, as the reason why afrs go "max lean" when decelerating.The job of a BOV is to open a passage for the excess air to exit the intake after the throttle body shuts closed to prevent the turbo from slowing down.I'm glad you brought up the vac line because that vac line is connected to the intake manifold,thats on the OTHER side of the TB.The BOV doesnt go on the intake manifold
@Triple88a You contradict yourself, if an engine "cannot run without air nor fuel" then how can it "decelerate without squirting fuel"? That's wrong. 'Max lean' means what it says, i.e. the least amount of fuel to keep it running.
Understand this, RECIRCULATING THE AIR TO THE INTAKE SIDE OF THE TURBO KEEPS IT SPINNING FASTER. That is the standard setup, don't change it.
The BOV will be connected to a VAC line aswell -Fact.
I don't think you have a turbo at all otherwise you'd know this.
@ImHereToAnnoyYou Engine running and decelerating are 2 different things dude. what is the "least amount of fuel to keep it running when the engine doesnt need power to keep running as its simply turning via inertia during deceleration? If you have ever tuned a ECU you'd know that FUEL IS CUT on deceleration. When you step on the gas or the rpms reach idle speed fuel comes back on and engine continues running.
@Triple88a Well I guess it depends what kind of fuelling system you have, it won't be completely cut on this BMW everytime you lift your foot off the gas. That will depend on the specific vehicle, whether it's in gear, you have the clutch depressed, if it's stationary etc etc. Regardless, it's a moot point, we're talking about a leaky BOV.
@ImHereToAnnoyYou When the vehicle switches to closed loop it will cut fuel on deceleration. What does change is how long after you lift your foot off the gas does the ecu cut fuel. On most vehicle its within 250ms.
Lol "on this BMW it wont be completely cut? The minimum fuel required to run the motor would cause lean mixture which will fry valves. Why would bmw choose to squirt some fuel and cause those dangers instead of simply cut fuel, safe fuel and eliminate lean mixture?
@Triple88a Yes I know the difference but I'm not sure what point you think you're making? If you're driving about and then coast in gear in a manual the ECU will go into open loop and cut fuel.
'That's not true' is from a comment about the BOV, I think you're getting mixed up.
@ImHereToAnnoyYou The bov on this vehicle is using a soft spring to eliminate compressor surge and increase sensitivity. Meaning the combined force of the turbo and the vacuum pulled by the intake manifold at cruise is forcing that spring open. Once you step on the gas to accelerate, the vacuum goes away and the BOV shuts closed.
@ImHereToAnnoyYou he stepped on the gas a tiny bit, that tiny bit would pull the motor from -20hg to -15hg.. thats nothing. I'm talking boost under load dude, not revving easily with your hand at 1500 rpm with no load on the motor but the oil pump and alternator.
@ImHereToAnnoyYou Another reason why your "facts" fall short. Let me explain, The turbo is run off by the exhaust gasses. Once you let go of the gas those gasses are no longer there so there is nothing to power the turbo. At that point if there is no blow off valve, the compressor side of the turbo will still compress with the inertia it has and slow down however if you do have a blow off valve, the turbo will not compress air however the inertial will last much longer...therefore LESS lag.
@Triple88a Nothing I have said 'falls short', it's just the way it is I'm afraid.
The BOV does it's job of expelling air right? (it dumps the boost pressure). That will stop the turbo stalling a bit but not as much as if you recirculate the dumped air back to the intake side before the turbo (BMW and all modern turbo cars do this as standard). Therefore installing this BOV will INCREASE lag as it will take slightly longer for the turbo to spool up again compared with a RECIRCULATING system.
@ImHereToAnnoyYou Correct the bov dumps boost pressure to prevent the turbo from stalling. In other words the turbo is still spinning after the bov is open correct? The only difference is that 10 psi of pressure you had in there is now lower... so how can air be sucked through the BOV when the turbo is still spinning at 80k rpm and the engine barely needs any air to run? Where does all the air go now?
@ImHereToAnnoyYou I dont have a turbo? Look at my god damn videos...thats from last year. Currently that car is running a lot more than a straight turbo.
Where is the valve getting the vacuum from?
The valve it self opens when vacuum is applied to it FROM THE INTAKE MANIFOLD as i've been saying in the past 5 fucking posts dude, stop repeating what i said.
Now for ur original bs...HOW WILL THE BOV SUCK IN AIR?
As far as your least amount of fuel bs goes have you tuned a standalone ECU?
@Triple88a Well I say because this BOV is clearly just open and leaking air out under acceleration and if you look at about 1:57 you'll see as the throttle is opened rapidly the change in air pressure sucks the paper in momentarily. It's obvious and having turbo cars I would have expected you to see that. It's plain there to see.
You can take your vacuum for the BOV of pretty much any pipe with a vacuum from the engine, it doesn't make much difference, same place as installing a boost gauge.
@ImHereToAnnoyYou The bov in this video will close when he goes in boost. Its simply using a softer spring so the turbo is spooling even when the engine it self is in vacuum. But wait this again contradicts your original statement of the bov sucking in air.
@Triple88a No I don't think it will, it's been setup wrongly. Like I said in my 'initial statement', it's just an air leak!
A normal BOV shouldn't blow air out like that under light throttle, surely you know that? It's leaking boost pressure out of what should be a closed system and as such when you come off the throttle air will be sucked back in because let's face it the turbo will barely be spinning in this test, no load, light throttle, probably no boost. You know that too right?
@ImHereToAnnoyYou Actually here is what you said "Try leaving the paper infront of it when you come OFF the throttle and you'll see it sucking in air and if you creep the throttle like that the turbo will barely be spinning if at all. Boot it." When you come OFF the throttle the bov will be venting at that time bud.
At 1:57 that happens because hes "opening the throttle" not OFF IT
The valve is not working as a valve and so it will suck air in off throttle, AND briefly when you open the throttle again. Listen at 1:57 and you can hear the 'tssh' as the throttle body opens, the engine is in vacuum and as soon as the throttle is opened, air rushes in to the leaking valve momentarily, before higher pressure air incoming from the turbo to the throttle blows back out of the valve.
@ImHereToAnnoyYou Next thing. What is the key object a recirculating system uses?
I'll give you a hint... its a DUMP VALVE..also known as BYPASS VALVE and BOV VALVE however instead of venting to atmosphere like a loud BOV does, that dump valve vents before the turbo where the turbo must compress it again just like it would have with a regular BOV. The modern turbo cars you speak of today do it this way because of emissions. By government regulations a MAF sensor is required.
@Triple88a Haha, well thanks for the 'hint' but, no shit a recirculating system uses a valve... we're a bit past that amazing revelation now...!
However, a recirculating system also changes the intake air pressure, a point which you have missed.
Recirculating the air keeps the turbo spinning faster, reduces turbo lag, eliminates more stalling extending the life of the turbo, and consequently will improve driveability and thus emissions. It's win-win, and that's why all modern turbos do it.
@ImHereToAnnoyYou You're contradicting your self all over, first you say the bov will suck in air then you say it vents excess air out, then now you're saying it increases intake air pressure? How the hell does vacuum in the intake piping go to excess air in the intake piping?
See you have some idea of how it works however you don't seem to grasp the full information quite right when its put together in the correct sequence.
@Triple88a No I think the confusion you have brought about yourself by bringing in other issues. This video shows a poorly setup BOV leaking air. In response to your replies I have talked mainly about an 'ideal situation' with a working BOV. Nothing I have said is contradictory.
Yes a properly fitted RECIRCULATED BOV setup should slightly increase intake air pressure. That is the best setup.
I've had a vent to atmosphere valve, now I have a recirculated one, for the reasons already stated.
Try leaving the paper infront of it when you come OFF the throttle and you'll see it sucking in air and if you creep the throttle like that the turbo will barely be spinning if at all. Boot it.
@Triple88a What? I'm saying if they floor the throttle aggressively they will see a greater effect.
I refer you back to my initial comment and ask you to answer why he mysteriously moves the paper away when coming off the throttle? Is it just coincidence?
@ImHereToAnnoyYou It makes no sense why he would remove it when he lets go of the throttle when that is exactly when the valve is suppose to vent.
At 1:57 he opens the throttle and that is the only time you will see the bov suck in air. Not when you let go or come off the throttle as you've been saying because again thats when the bov will vent since the moving air meets the now closed throttle body.
@ImHereToAnnoyYou I never changed my mind. Thats what i've been saying since my first comment... The only time it will suck in air is when you open the throttle, you are the one saying it will suck in the paper when you get OFF the throttle. Getting OFF the throttle means letting go of the throttle.
@ImHereToAnnoyYou The vehicle above is running a map sensor so the fact that hes running an open bov does not affect the engine even though its leaking. However you would be correct if the vehicle was running a maf sensor in front of the turbo.
On this BMW it will create more turbo lag as the excess air is vented to the atmosphere instead of being recirculated back to the intake side of the turbo, so it would affect how it drives especially between gears (however peak power would not change)
Aside from jerky shifting on light shifts you could get all sorts of dust sucked into the engine, affecting performance
Indeed on cars with a MAF the dumped air would also cause the vehicle to run rich but that's not relevant here.
so at the end of the day would even putting a filter on do any kind of affect on the bov or you're cars performance..because l got one on mine an no issues what so ever
Great vid. All of you that don't understand or don't believe this are RETARDED!!! On a forced induction car, vacuum occurs AFTER THE THROTTLE BODY! Notice he never actually loads the engine, thus keeping it in vac which keeps the valve open...if he hit the throttle enough to load the car then the bov would snap shut and boost would build. I swear half of you IDIOTS have never drivin a turbo'd car before...
if my bov was open like that at idle i would have un-metered air escaping the system would create a rough idle and rich condition. for this to work the system would have to utilize an ecu tuned with out a MAF for it to work correctly right?
also the vacuum tube for the BOV would have to have to be placed on the intake manifold after the trottlebody to take the vacuum pressure and not the positive pressure the turbo is making at idle.
what an amazing machine making boost at idle. I wish my mitsu could do that, but it actually needs 2500+ revs to actually start building some low pressure, and 4000 revs to hit full boost
in australia if ur blow off valve is open to atmosphere it is a 141 dollar fine and a defect notice is issued it needs to be plumbed to your air box fucking cops
JEEZE, are you guys retarded?? he's opened it up for demonstration purposes, to show that it CONTINUOUSLY blowing out air, and not letting it it, when he is actually driving, he will close it, to let it build pressure...
@nigleman No, watch the other videos, it stays open at idle and until it's loaded. It's idiotic as it's nothing but a leak and will kill response. This is NOT the way it should work, but synapse seems to think this is normal and OK (yet they're the only BOV that does this in the world)
@viru52000 It looks like they took out the pop-off valve to show that the BOV does not suck in air -_-. Without the pop-off valve it just dumping air out thus showing that you don't need a filter since the bov is not sucking any air in.
@madmestesoskillz No, it's not removed. It's closed before the car starts up. If the valve was removed it never would have opened as the air would have kept it closed. Also, if you're thinking it's the piston, it's still there. Yet again, you're clueless...
the only reason i would put one of these on my car is if i had a turbo and i didnt want it for high performance use, which kinda defeats the purpose of having a turbo in the first place. but theres no point in having small turbos on a car that build boost at idle. your better having larger turbos that build boost under open throttle so that the bov will only open anyway when your putting your foot to the floor anyway. in my opinion total waste of money.
And the only thing people have corrected me about is what type of air meter this cars has and what different types do,everything else i have said no one has commented on, so i must be correct.So this tells me the only thing people want to discuss about over this video is what type of air meter it has lol.
Ok, to everyone that has corrected me about AFM/MAF/MAS, thank you i now understand that they read different things to do with air.But my point was that they all read air generally,just not in the same way.
"MAP or MAF same bloody thing...it reads air thats it." if you didnt realize, i was being sarcastic.We can sit here and talk about the differences about AFM/MAF/MAS's if you really want to...?
@AmericanMuscleKiller i dont know what fairy tales you've herd and i hate to rain on your parade, but MAP sensors and MAF sensors are not the same. MAP sensors messure air pressure or vacuum in the intake manifold while MAF sensors messure air flow threw the air intake going into the engine..
boost leak??? blow off valves work off vacuum, and are completely shut when vac gets to 0 and starts building boost,.. where is the boost leak???? thats why when you let off the throttle is builds vacuum again so the blow off valve opens to release pressure between the throttle plate and the turbo.
On a supercharger set-up this BOV system would work for the better,but for turbo applications if you want to use a BOV like this you should have it before the MAF/AFM so its releasing unmetered air,not metered air and creating a leak, with a BPV it can be after the MAF because it wont create a leak and will put the excess air back into the intake system and also works releasing air before not after the intercooler so the hot air doesnt have to go through the intercooler as much keeping it cooler
@BillyBobBizWorth maf reads air flow, as in how much air is flowing into the turbo, map is air pressure as in how many pounds per square inch of air there is, huge difference.
If you think its a efficient turbo and thats why its releasing air then why would have a open atmosphere BOV? that BOV is not taking advantage of this such efficient turbo by releasing it into the atmosphere is it?, it should be recirculating that air to keep that efficiency that the turbo is producing in the system not chucking it out.
But if thats what youve been taught.... go for gold lol
Because of that my 160HP GSR would smoke it for sure haha.
To make it what it is, sure their will be some restrictions and such but overall there aint usually much unless your into high performance.So mainly all these aftermarket parts and mods you do at your own risk,do some research dont just jump on the bandwagon and then have issues. I will never get a open atmosphere BOV unless it does what i said before and that is just get rid of the excess air as fast as possible,same with a external wastegate,and obviously make sure it aint leaking like yours..
LOL one more thing is that, open atmosphere BOV's give you worse performance generally overall unless they do what they are meant to, and that is get rid of that excess air as fast as possible, none of this having a BOV to have a cool sound coming from it, if looks and sounds if what your after from a car and aftermarket parts then so be it, but dont come crying in forums when you cars running all shitty and you cant figure it out, car manufacturers spent alot of time and money on their cars...
On top of that the only reason that a BOV would have a filter would be so if you BOV does leak air or intake air its going to be filtered not dirty, just like a filter on a oil catch can does, incase it intakes after a pressure release.
Anyways i hope you take in the information everyone has told you because they arent lying to you, i think you are misinformed or need to think before you speak about things alot of people know about.
Are you a customer or the mechanic at that workshop?
Hey Synaptic, im not here to judge you like other people have but they are right, its a open atmosphere BOV because it releases the excess air back into the atmosphere where as stock/recirculated/plumb back BOV will put the air back into the intake system so BOV leaks arent as major problem as a open atmosphere, but it is still a problem(diaphram/plate or spring) and should be fixed for it to operate properly.
@Sarumatix It isn't leaking pressure, it is in bypass mode under high vacuum, which unloads the compressor and eliminates unneccessary backpressure when the demand isn't there. Once the intake manifold goes to -2" of vac the BOV is closed in order for the system to build pressure.
@SynapseRawUncut man you are a fking joke dude, if you think a BOV is supposed to open on idle go back to lego. this video has been posted up on forums, everyone is laughing at you.
@HardstylePete wow, I doubt you'll ever be aware of the level of ignorance your assumptions are keeping you at. Ask any OEM engineer and they'll tell you that their designs operate with the DV open at idle = high vacuum. After market designs don't know what they're doing so they overspring the BOV/DV. You and the other ignorant posters are the % of customers that we don't want, thank you for self-filtering, no pun intended.
@SynapseRawUncut the point of a large spring is to allowed for increased boost pressure over stock. if the BOV is open at any point, pressure is escaping the intake thus the turbo isn't working. Pressure should only be released when there's a sudden drop in pressure between the intake manifold and the intake piping. also, the whole suggestion that a BOV requires a filter is just retarded, the BOV is a one way valve, air should never enter the BOV since it should only open to release pressure.
@HardstylePete After market companies need large springs because they don't actually know how to design the device properly. Watch the vids under our rawuncut channel and you'll see that a leak-free design under boost is our top priority. There is a difference between bypass under vacuum & being leak-free under boost.
@fafinaf the 335i uses the Bosch diaphragm DVs. Eventually they fail at the diaphragm and you get a leak in boost with a gradual reduction in overall performance. It is a good idea to get rid of them.
BOV's aren't supposed to vent air at idle or at WOT! They vent the excess pressure built up from the turbo when you back the throttle off. At all other times it should be closed. Why is this one open but every other BOV manufacturer on the market would be closed at idle? It's as if this BOV has been put on backward so to speak. Saying it's the turbo being so efficient is a load of cr@p, your BOV doesn't care how efficient your turbo is, it's only function is to dump the air. this is BOV FAIL!!
No it's not a boost leak, it's just a leak in general, even at idle or cruising throttle air is being drawn in to the intake and If the bov is letting some of this air escape, that, children is called?.... Yaaaaay a leak!!!!!...nice try tho...
Very nice setup, should eliminate surge and help linearly degrade lag. I think it would help decrease the retarded youtube comments if the operation was explained a little more.
1. Discharging boosted side air at vacuum reduces "backward" pressure on the turbo, reducing lag.
2. HELD OPEN operation at vacuum allows all high boost air to be expelled almost immediately
It operates almost exactly like the surge valve setup on most centri units
Can we say....DUMB ASS!!! This turbo is "acting like a centrifugal blower. It's blowing TOO MUCH air at idle, therefore it needs to be vented. Once the car goes WOT the valve THEN shuts and is sealed so the car can build boost. This isn't for every turbo charged car out there, but since this particular car flows so much air at idle, it needs to be setup like this
there are no pro drift, drag, or autcross racers that use thise product, if it was so amazing why is nobody but suckers using it? I'm not here trying to start fights my point is, nobody has proven otherwise...
umm... shouldnt the waste gate open up to regulate the pressure the turbo is creating. not the blow off valve. i was under the impression that the blow off valve releases the pressure between the manifold intake and the engine, when the throttle is released. the only thing that should stay open like that is the waste gate valve which regulates the pressure in the engine. not the bloody blow off valve O.o
@mkrv4jtta when you say bypass valve you are referring to a diverter valve, found on most turbocharged vw/audi. this diverter valve is recirculating metered air (MAF). at idle this "bov" or diverter valve is open. the vacuum from the engine keeps this valve open at idle (hence the vacuum line going to it).
@mkrv4jtta only when the engine/ diverter valve reaches 0in of vacuum does this valve close (thats why the spring is there), and thus holds boost. When the car in the vid is at "highway speed" the engine is probably at about 20in of VACUUM with little to no load being applied to the engine.. Just because one engine works one way, that doesnt mean that all engine work in the same way
@mkrv4jtta actually if you are at highway cruisings speed and your boost gauge is at 20vac, you have an issue, normal cruising vacuum on a turbo vehicle is 99% of the time 10-15vac, its only when throttle is let off and more vacuum is drawn that you reach 20, cruising should NEVER be at 20 vac, I'm not here to argue how great or not great this product is,
all I'll say is, its been out for over a year and I have yet to see it in any reputible auto magazine, if it was as great as it is claimed you would hear ALOT more about it, and see adds everywhere like you do other brands (and alot of these "other brands are garbadge IMO")but you dont so I'll leave it at that, good day
And a supercharger doesn't bypass the air into the atmosphere it recirculates the air through the supercharger. So maybe u should have a hose connected to that bov or u are gonna have more turbo lag than if it wasn't open.
I think everybody needs to calm down, And for all you idiots saying it is making boost at idle then it would be closed because the boost coming into the hose connected to the blow off valve would push the valve or diaphram closed. No it shouldn't be open, there should be no air leaks in the intake tract. Some blow off valve's come with interchangeable springs or a screw to put more tension on the blow off valve. I think thats the case here.
not too many of you guys, know how the euro turbo cars work. the bov's/dv's stay open untill there is enough pressure, to close it to make boost. its just how they Germans designed things. and he never rev'd the motor to make enough pressure to close the valve or the wastegate
lol BOV is leaking hard lol.....the bov should be closed so you could acumilate boost....thats why u got a wastegate actuator....really...a bov releasing air lol and i thought my GF was retarted lol
just to let you know you are in fact, an IDIOT. i have a procharged harley and that is exactly how it works!!!! the wastegate is to regulate boost not to say when it's supposed to come on or off. Once boost comes on it forces the BOV closed. why don't you learn some shit before you start talking some shit!. yup your GF is probably retarded!!
well, first off your GF probably does RIDE the special bus. Secondly I have a procharged harley and that is exactly how it's supposed to work!! the wastegate is supposed to regulate boost not determine when it comes on or off!! Once boost is started the BOV is closed!!! Why don't you learn some shit before you start talking some shit!!
you said pro charge...in this case this is turbo charged and i have myself a mazdaspeed.maybe in the set up of your harley is different from a car but my car the BOV has to be shut even on idle and as you could see in the video he accelerates and more air comes out....and yes wastegate regulates the pounds of boost depending how hard the spring is but it also releases the boost when you let go of the gas that's why theres a little switch in the turbo were you hook it to.stop talking shit dogg
@johnnydogg87 listen to how he says "and now under load on a freeway it's STILL blowing air out" lol! he might as well have said "its STILL LEAKING LIKE HELL!" LOL!
wow, what a failure. enough efficiency, your blow off valve is stuck open when the motor is running, BOV's are supposed to close so you can buiild boost, instead of spraying it out of the bov.,
seriously??...this is not a boost leak. rev your turbo charged car to lets say 3500rpm. what does the boost gauge say?? it certainly doesnt go into boost, just more vaccum
@synaptic1 how is that a BoV? the BoV is used to release exess boost after the throttle is let off... why is this one staying open? Wouldnt that make it so it could not build up pressure?
@BillyBobBizWorth ok a couple things 1) if the throttle shuts and stops providing vacuum to the bov the bov would close 2) map and maf do have the same idea but how they function are completely different (thus they react differently to boost) see the map reads manifold pressure (and is located on the manifold) the maf is going to read the actual air flow (this would be located in most cases right after the air filter
nice rolex
pikku81 1 week ago
under vacuum the valve will stay open,and discharge air.. not suck in air... the turbo is sitll spinning,and creating positive pressure... just not enough to over come the vacuum. i dont understand what people thing bov's suck in air at idle or in vacuum.. for that to happen the turbo it self would be spinning backwards... use your brains people.. think how things work before you post
nordicbeast 4 weeks ago
Hmm, the BOV is discharging air at idle, and yet the engine is still under vacuum during idle and not boost. Seems to me that you have a leaky BOV because all of that air should be sucking through the throttle body during vacuum, and discharged only when boost pressure is being realized....
StreetLethalRacing 5 months ago
you may want to do a little research on how a bov is actually supposed to function cause that thing is all sorts of messed up
nine3cobra 6 months ago
@nine3cobra Agreed....
StreetLethalRacing 5 months ago
Only a BMW owner would ask a question this dumb. Try building ur own car or at least learning how the fuck shit works instead of just putting a bov on cause it sounds cool....
bmxguy08 6 months ago
nice submariner
bunnyna6 7 months ago
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synaptic1 7 months ago
why would a BOV even suck in air?
gwmkwan 8 months ago
nice rolex
ErIcK305 8 months ago 2
So 335i are MAP metered? If it's MAF then VTA is bad especially if it's always venting.
mitsufq360 8 months ago
crap you put it in backwards ;)
nnnrtn 8 months ago
why does always take the paper away from he releases throttle! Damn asian engineering!!!
theyellow240z 9 months ago
Something wrong there...
killerCharade 9 months ago
Err Nope.
Try leaving the paper infront of it when you come OFF the throttle and you'll see it sucking in air and if you creep the throttle like that the turbo will barely be spinning if at all. Boot it.
It only takes a little intelligence to work out that the spring in a BOV can only compress and make it's sound when the air flowing through it changes direction, think about it.
What you've done is installed an air leak and that's why the engine is vibrating. You must recirculate the air.
ImHereToAnnoyYou 10 months ago
@ImHereToAnnoyYou Err yes. When you come OFF the throttle that means the throttle plate will CLOSE while the turbo is still spinning at high rpm. In other words pressure inside the intake pipe will build up therefore a sharp burst of air will be released out from the bov, not the other way...remember pressure goes from high to low. The only time that bov will suck in air is in the instant when you stomp on the gas while in low rpms however the bov will quickly close..
Triple88a 9 months ago
@Triple88a Err that's what I'm saying, the throttle closes, the gas is vented. However once expelled it leaves behind a VACUUM in the pipe which will cause air to be sucked in and thus the bit of paper, however he moves it away so you can't see it.
That BOV will suck in air from the atmosphere every time you come off the throttle, it will suck in whatever air is around, not directly into the engine, but into the intake pipe between the inlet manifold and the turbo, and therefore then the engine
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou It wouldn't leave a vacuum as the velocity is not that high, also the turbo does not stop spinning. If the air in the intake was going 200 mph and the turbo just stopped spinning the instant you release the gas, there would be some vacuum by the turbo but in real life that is not the case. Your turbo lag theory falls short on 2 occasions. 1st is If the turbo never stops, there is no lag. 2nd is recirculated air is not forced into the turbo so its no different than VTA.
Triple88a 9 months ago
@Triple88a No it's not a theory, it's the facts. I never said the turbo stops spinning, I said lag will increase.
I don't think you've realised that turbos run off exhaust gases and off boost the engine will be running a vacuum so if you install a leak it will draw air in to equalise the pressure
Haven't you seen a boost gauge? The following clip clearly shows the -ve vacuum and +ve boost readouts for this exact car, you can see it goes into vacuum between gear changes too > watch?v=woGrgQOf4t8
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou I'm a running a DIY turbo on my vehicle with a standalone... i know more than you think. It goes in vacuum between gear changes because the boost gauge measure the manifold pressure which is suppose to be in vac as the throttle body is closed. Gotta know ur facts not just guess and call them facts.
Triple88a 9 months ago
@Triple88a Do you think an engine can run without air? No it can't, so when we talk about the throttle being 'closed', it doesn't mean the engine actually stops taking in air and fuel, It just takes much less. Similarly it doesn't stop pumping out exhaust gas as you suggest, that would be silly.
This is why as I stated in my first comment; he takes the paper away because you would see it suck in air, that is a fact. BOVs are usually connected up to a vac line as you should know if you have one.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou No an engine cannot run without air nor fuel obviously it does however decelerate without squirting fuel, as the reason why afrs go "max lean" when decelerating.The job of a BOV is to open a passage for the excess air to exit the intake after the throttle body shuts closed to prevent the turbo from slowing down.I'm glad you brought up the vac line because that vac line is connected to the intake manifold,thats on the OTHER side of the TB.The BOV doesnt go on the intake manifold
Triple88a 9 months ago
@Triple88a You contradict yourself, if an engine "cannot run without air nor fuel" then how can it "decelerate without squirting fuel"? That's wrong. 'Max lean' means what it says, i.e. the least amount of fuel to keep it running.
Understand this, RECIRCULATING THE AIR TO THE INTAKE SIDE OF THE TURBO KEEPS IT SPINNING FASTER. That is the standard setup, don't change it.
The BOV will be connected to a VAC line aswell -Fact.
I don't think you have a turbo at all otherwise you'd know this.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou Engine running and decelerating are 2 different things dude. what is the "least amount of fuel to keep it running when the engine doesnt need power to keep running as its simply turning via inertia during deceleration? If you have ever tuned a ECU you'd know that FUEL IS CUT on deceleration. When you step on the gas or the rpms reach idle speed fuel comes back on and engine continues running.
Triple88a 9 months ago
@Triple88a Well I guess it depends what kind of fuelling system you have, it won't be completely cut on this BMW everytime you lift your foot off the gas. That will depend on the specific vehicle, whether it's in gear, you have the clutch depressed, if it's stationary etc etc. Regardless, it's a moot point, we're talking about a leaky BOV.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou When the vehicle switches to closed loop it will cut fuel on deceleration. What does change is how long after you lift your foot off the gas does the ecu cut fuel. On most vehicle its within 250ms.
Lol "on this BMW it wont be completely cut? The minimum fuel required to run the motor would cause lean mixture which will fry valves. Why would bmw choose to squirt some fuel and cause those dangers instead of simply cut fuel, safe fuel and eliminate lean mixture?
Triple88a 9 months ago
@Triple88a I think you mean it will go into open loop and cut fuel, not closed loop?
If this is an automatic then it's quite possible fuel would not be cut as quickly, but it doesn't matter does it because we're not talking about fuel.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou Do you know the meaning behind open and closed loop?
You say "thats not true"... that's your statement dude i just copied it from your original post lol.
Triple88a 9 months ago
@Triple88a Yes I know the difference but I'm not sure what point you think you're making? If you're driving about and then coast in gear in a manual the ECU will go into open loop and cut fuel.
'That's not true' is from a comment about the BOV, I think you're getting mixed up.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou The bov on this vehicle is using a soft spring to eliminate compressor surge and increase sensitivity. Meaning the combined force of the turbo and the vacuum pulled by the intake manifold at cruise is forcing that spring open. Once you step on the gas to accelerate, the vacuum goes away and the BOV shuts closed.
Triple88a 9 months ago
@Triple88a But.... they stepped on the gas and the valve didn't close it just blew more air out so.... that's not true...
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou he stepped on the gas a tiny bit, that tiny bit would pull the motor from -20hg to -15hg.. thats nothing. I'm talking boost under load dude, not revving easily with your hand at 1500 rpm with no load on the motor but the oil pump and alternator.
Triple88a 9 months ago
@Triple88a Well it was enough to draw the paper in a little, proving my point nicely.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou Another reason why your "facts" fall short. Let me explain, The turbo is run off by the exhaust gasses. Once you let go of the gas those gasses are no longer there so there is nothing to power the turbo. At that point if there is no blow off valve, the compressor side of the turbo will still compress with the inertia it has and slow down however if you do have a blow off valve, the turbo will not compress air however the inertial will last much longer...therefore LESS lag.
Triple88a 9 months ago
@Triple88a Nothing I have said 'falls short', it's just the way it is I'm afraid.
The BOV does it's job of expelling air right? (it dumps the boost pressure). That will stop the turbo stalling a bit but not as much as if you recirculate the dumped air back to the intake side before the turbo (BMW and all modern turbo cars do this as standard). Therefore installing this BOV will INCREASE lag as it will take slightly longer for the turbo to spool up again compared with a RECIRCULATING system.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou Correct the bov dumps boost pressure to prevent the turbo from stalling. In other words the turbo is still spinning after the bov is open correct? The only difference is that 10 psi of pressure you had in there is now lower... so how can air be sucked through the BOV when the turbo is still spinning at 80k rpm and the engine barely needs any air to run? Where does all the air go now?
Triple88a 9 months ago
@Triple88a Yes, I think you're beginning to understand;
Think about the valve itself, how does it know when to open and when to close?
It is because of the vacuum pipe connected to it. The engine goes into vacuum off throttle causing a spring to compress inside, opening the valve.
The BOV in this video is incorrectly set up to be open all the time (an air leak), it's blowing air out on part throttle.
That's boost pressure meant for the engine being vented to atmosphere, right?
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou I dont have a turbo? Look at my god damn videos...thats from last year. Currently that car is running a lot more than a straight turbo.
Where is the valve getting the vacuum from?
The valve it self opens when vacuum is applied to it FROM THE INTAKE MANIFOLD as i've been saying in the past 5 fucking posts dude, stop repeating what i said.
Now for ur original bs...HOW WILL THE BOV SUCK IN AIR?
As far as your least amount of fuel bs goes have you tuned a standalone ECU?
Triple88a 9 months ago
@Triple88a Well I say because this BOV is clearly just open and leaking air out under acceleration and if you look at about 1:57 you'll see as the throttle is opened rapidly the change in air pressure sucks the paper in momentarily. It's obvious and having turbo cars I would have expected you to see that. It's plain there to see.
You can take your vacuum for the BOV of pretty much any pipe with a vacuum from the engine, it doesn't make much difference, same place as installing a boost gauge.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou The bov in this video will close when he goes in boost. Its simply using a softer spring so the turbo is spooling even when the engine it self is in vacuum. But wait this again contradicts your original statement of the bov sucking in air.
Triple88a 9 months ago
@Triple88a No I don't think it will, it's been setup wrongly. Like I said in my 'initial statement', it's just an air leak!
A normal BOV shouldn't blow air out like that under light throttle, surely you know that? It's leaking boost pressure out of what should be a closed system and as such when you come off the throttle air will be sucked back in because let's face it the turbo will barely be spinning in this test, no load, light throttle, probably no boost. You know that too right?
ImHereToAnnoyYou 9 months ago
This has been flagged as spam show
@ImHereToAnnoyYou Actually here is what you said "Try leaving the paper infront of it when you come OFF the throttle and you'll see it sucking in air and if you creep the throttle like that the turbo will barely be spinning if at all. Boot it." When you come OFF the throttle the bov will be venting at that time bud.
At 1:57 that happens because hes "opening the throttle" not OFF IT
Triple88a 9 months ago
@Triple88a Yeah thanks, but I know what I said.
The valve is not working as a valve and so it will suck air in off throttle, AND briefly when you open the throttle again. Listen at 1:57 and you can hear the 'tssh' as the throttle body opens, the engine is in vacuum and as soon as the throttle is opened, air rushes in to the leaking valve momentarily, before higher pressure air incoming from the turbo to the throttle blows back out of the valve.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou Next thing. What is the key object a recirculating system uses?
I'll give you a hint... its a DUMP VALVE..also known as BYPASS VALVE and BOV VALVE however instead of venting to atmosphere like a loud BOV does, that dump valve vents before the turbo where the turbo must compress it again just like it would have with a regular BOV. The modern turbo cars you speak of today do it this way because of emissions. By government regulations a MAF sensor is required.
Triple88a 9 months ago
@Triple88a Haha, well thanks for the 'hint' but, no shit a recirculating system uses a valve... we're a bit past that amazing revelation now...!
However, a recirculating system also changes the intake air pressure, a point which you have missed.
Recirculating the air keeps the turbo spinning faster, reduces turbo lag, eliminates more stalling extending the life of the turbo, and consequently will improve driveability and thus emissions. It's win-win, and that's why all modern turbos do it.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou You're contradicting your self all over, first you say the bov will suck in air then you say it vents excess air out, then now you're saying it increases intake air pressure? How the hell does vacuum in the intake piping go to excess air in the intake piping?
See you have some idea of how it works however you don't seem to grasp the full information quite right when its put together in the correct sequence.
Triple88a 9 months ago
@Triple88a No I think the confusion you have brought about yourself by bringing in other issues. This video shows a poorly setup BOV leaking air. In response to your replies I have talked mainly about an 'ideal situation' with a working BOV. Nothing I have said is contradictory.
Yes a properly fitted RECIRCULATED BOV setup should slightly increase intake air pressure. That is the best setup.
I've had a vent to atmosphere valve, now I have a recirculated one, for the reasons already stated.
ImHereToAnnoyYou 9 months ago
This has been flagged as spam show
@ImHereToAnnoyYou How is this correct?
Try leaving the paper infront of it when you come OFF the throttle and you'll see it sucking in air and if you creep the throttle like that the turbo will barely be spinning if at all. Boot it.
Triple88a 9 months ago
@Triple88a What? I'm saying if they floor the throttle aggressively they will see a greater effect.
I refer you back to my initial comment and ask you to answer why he mysteriously moves the paper away when coming off the throttle? Is it just coincidence?
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou It makes no sense why he would remove it when he lets go of the throttle when that is exactly when the valve is suppose to vent.
At 1:57 he opens the throttle and that is the only time you will see the bov suck in air. Not when you let go or come off the throttle as you've been saying because again thats when the bov will vent since the moving air meets the now closed throttle body.
Triple88a 9 months ago
@Triple88a I agree, it makes no sense..... because it would suck the paper in as it's just an air leak.
Now you're changing your mind and saying BOV's are supposed to suck in air when you open the throttle? Err...
My point was made in my first comment.
ImHereToAnnoyYou 9 months ago
@ImHereToAnnoyYou I never changed my mind. Thats what i've been saying since my first comment... The only time it will suck in air is when you open the throttle, you are the one saying it will suck in the paper when you get OFF the throttle. Getting OFF the throttle means letting go of the throttle.
Triple88a 9 months ago
@ImHereToAnnoyYou The vehicle above is running a map sensor so the fact that hes running an open bov does not affect the engine even though its leaking. However you would be correct if the vehicle was running a maf sensor in front of the turbo.
Triple88a 9 months ago
@Triple88a
On this BMW it will create more turbo lag as the excess air is vented to the atmosphere instead of being recirculated back to the intake side of the turbo, so it would affect how it drives especially between gears (however peak power would not change)
Aside from jerky shifting on light shifts you could get all sorts of dust sucked into the engine, affecting performance
Indeed on cars with a MAF the dumped air would also cause the vehicle to run rich but that's not relevant here.
ImHereToAnnoyYou 9 months ago
why not have it closed and get more power?
xXxDANMANxXx 10 months ago
So essentially the BOV is just leaking the whole time? Good to know im going with an SSQV now.
Crusher103 11 months ago
oh i just saw it -_-. i got pwnded
madmestesoskillz 11 months ago
so at the end of the day would even putting a filter on do any kind of affect on the bov or you're cars performance..because l got one on mine an no issues what so ever
Drifter904 11 months ago
@Drifter904 doesnt do anything for about performance, adding a filter increases the safety
Triple88a 9 months ago
The watch is a fake! The car is a beast!!!!!
roweo00 1 year ago
@roweo00 "The watch is a fake"?? what does that mean? is the watch not showing the correct time?
nwfklan 1 year ago
bro if you dont put load on the engine it is never gonna suck in........
pirdoulis 1 year ago
thats why its called BLOW OFF valve!
7912712 1 year ago
Great vid. All of you that don't understand or don't believe this are RETARDED!!! On a forced induction car, vacuum occurs AFTER THE THROTTLE BODY! Notice he never actually loads the engine, thus keeping it in vac which keeps the valve open...if he hit the throttle enough to load the car then the bov would snap shut and boost would build. I swear half of you IDIOTS have never drivin a turbo'd car before...
ProteinBoogers 1 year ago 2
@ProteinBoogers (i have a turbo. dont yell at me :)
if my bov was open like that at idle i would have un-metered air escaping the system would create a rough idle and rich condition. for this to work the system would have to utilize an ecu tuned with out a MAF for it to work correctly right?
also the vacuum tube for the BOV would have to have to be placed on the intake manifold after the trottlebody to take the vacuum pressure and not the positive pressure the turbo is making at idle.
rustynuggets 1 year ago
i have the same watch
eddx56 1 year ago
@eddx56 What watch is that? I have an Invicta watch my self that looks almost just like it.
Zgodni12 1 year ago
@Zgodni12 That would be a Rolex Submariner. Best watch I've ever owned.
JakeLoughin 1 year ago
why dont you show when you release throttle?
xXBrIIaANXx 1 year ago
what happens when you start the engine? still blowing??
daJuels 1 year ago
what an amazing machine making boost at idle. I wish my mitsu could do that, but it actually needs 2500+ revs to actually start building some low pressure, and 4000 revs to hit full boost
dtenev2 1 year ago
@dtenev2 amen to that, I was just thinking the same about my talon. might be time to upgrade to a more efficient turbo : \
bleachworthy 1 year ago
why iss it still open????
Cupra317hp 1 year ago
@Cupra317hp
cause the motor is till running
Th33xitus 1 year ago
@Cupra317hp because its not producing enough boost to close.
nwfklan 1 year ago
in australia if ur blow off valve is open to atmosphere it is a 141 dollar fine and a defect notice is issued it needs to be plumbed to your air box fucking cops
stugats77 1 year ago
@stugats77 Never head of something like that before. Lol
nwfklan 1 year ago
JEEZE, are you guys retarded?? he's opened it up for demonstration purposes, to show that it CONTINUOUSLY blowing out air, and not letting it it, when he is actually driving, he will close it, to let it build pressure...
nigleman 1 year ago
@nigleman No, watch the other videos, it stays open at idle and until it's loaded. It's idiotic as it's nothing but a leak and will kill response. This is NOT the way it should work, but synapse seems to think this is normal and OK (yet they're the only BOV that does this in the world)
viru52000 1 year ago
Comment removed
madmestesoskillz 11 months ago
@viru52000 It looks like they took out the pop-off valve to show that the BOV does not suck in air -_-. Without the pop-off valve it just dumping air out thus showing that you don't need a filter since the bov is not sucking any air in.
madmestesoskillz 11 months ago
@madmestesoskillz Like I said, watch their other videos, no the valve is not removed.
viru52000 11 months ago
@viru52000 On the other videos, yes the valve is not removed. On this video, it is removed. But I do agree it only closes during pressure.
madmestesoskillz 11 months ago
@madmestesoskillz No, it's not removed. It's closed before the car starts up. If the valve was removed it never would have opened as the air would have kept it closed. Also, if you're thinking it's the piston, it's still there. Yet again, you're clueless...
viru52000 11 months ago
check ur spring bro
buster2191 1 year ago
hahahaha!!! kinda retarded! hahaha!!! HUGE LEAK!!! HAHAHA!!!
smtbbo 1 year ago
slab a hks bov on there and done deal
goochada66 1 year ago
the only reason i would put one of these on my car is if i had a turbo and i didnt want it for high performance use, which kinda defeats the purpose of having a turbo in the first place. but theres no point in having small turbos on a car that build boost at idle. your better having larger turbos that build boost under open throttle so that the bov will only open anyway when your putting your foot to the floor anyway. in my opinion total waste of money.
sickgr33k 1 year ago
dude is wearing a Rolex XD
TanguyMS 1 year ago
is that why 2011 135i single turbo dont have the vacumm line?please help
chogokin721 1 year ago
So there is no vacuum, those turbos have to be the size of a real life snail to push at idle.
tienshenhan86 1 year ago
And the only thing people have corrected me about is what type of air meter this cars has and what different types do,everything else i have said no one has commented on, so i must be correct.So this tells me the only thing people want to discuss about over this video is what type of air meter it has lol.
BillyBobBizWorth 1 year ago
Ok, to everyone that has corrected me about AFM/MAF/MAS, thank you i now understand that they read different things to do with air.But my point was that they all read air generally,just not in the same way.
"MAP or MAF same bloody thing...it reads air thats it." if you didnt realize, i was being sarcastic.We can sit here and talk about the differences about AFM/MAF/MAS's if you really want to...?
BillyBobBizWorth 1 year ago
ya this is gay, bov should never be releasing air unless u shift gears, this is a boost leak. the bov should be shut tight under idle or load.
tomjw7 1 year ago
@tomjw7 I think his turbo is for show, like his clunky watch.
buckstarchaser 1 year ago
Comment removed
tomjw7 1 year ago
@AmericanMuscleKiller i dont know what fairy tales you've herd and i hate to rain on your parade, but MAP sensors and MAF sensors are not the same. MAP sensors messure air pressure or vacuum in the intake manifold while MAF sensors messure air flow threw the air intake going into the engine..
lilclos801 1 year ago
boost leak??? blow off valves work off vacuum, and are completely shut when vac gets to 0 and starts building boost,.. where is the boost leak???? thats why when you let off the throttle is builds vacuum again so the blow off valve opens to release pressure between the throttle plate and the turbo.
lilclos801 1 year ago
i dont get it. Why did the BOV not close when throttle was given???
flyguyviky 1 year ago
@flyguyviky +1 this bov is crap, it will increase turbo lag....
minusxp 1 year ago
Comment removed
willpmack 1 year ago
This has been flagged as spam show
Unless he has that beast on a dyno thats not under load, it's just revving a engine.
willpmack 1 year ago
Comment removed
willpmack 1 year ago
Perfect example of when the customer takes the mechanics words like gosbel.
BillyBobBizWorth 1 year ago
high vaccuum on freeway? cmon.. peak vacuum on an engine is at idle
NeXtras 1 year ago
LMAO, BOV's are hooked up to vac lines...
ILLMATIC13501 1 year ago
This has been flagged as spam show
YOU ARE A FOOL MAN!
d240786 1 year ago
this makes no sense to me. how can the turbos build pressure when air is constantly coming out of the open BOV?
typically the BOV should remain shut until throttle off and open to release pressure, not remain open?
what is different about this setup?
what is the vacuum reading @ idle?
will the BOV shut under actual load?
if not, this contradicts all BOVs and turbo setups i have seen.
more info please?
rustynuggets 1 year ago
On a supercharger set-up this BOV system would work for the better,but for turbo applications if you want to use a BOV like this you should have it before the MAF/AFM so its releasing unmetered air,not metered air and creating a leak, with a BPV it can be after the MAF because it wont create a leak and will put the excess air back into the intake system and also works releasing air before not after the intercooler so the hot air doesnt have to go through the intercooler as much keeping it cooler
BillyBobBizWorth 1 year ago
@BillyBobBizWorth you are a complete idiot. 335i has a MAP sensor not MAF. Get your facts straight broseph.
AmericanMuscleKiller 1 year ago
@AmericanMuscleKiller How am i a complete idiot exactly? MAP or MAF same bloody thing...it reads air thats it.
BillyBobBizWorth 1 year ago
Comment removed
trdnismoguy 1 year ago
@BillyBobBizWorth MAP and an MAF are not the same thing... at all.
AmericanMuscleKiller 1 year ago
@BillyBobBizWorth maf reads air flow, as in how much air is flowing into the turbo, map is air pressure as in how many pounds per square inch of air there is, huge difference.
tomjw7 1 year ago
Comment removed
BillyBobBizWorth 1 year ago
If you think its a efficient turbo and thats why its releasing air then why would have a open atmosphere BOV? that BOV is not taking advantage of this such efficient turbo by releasing it into the atmosphere is it?, it should be recirculating that air to keep that efficiency that the turbo is producing in the system not chucking it out.
But if thats what youve been taught.... go for gold lol
Because of that my 160HP GSR would smoke it for sure haha.
See you on the track. :-)
BillyBobBizWorth 1 year ago
To make it what it is, sure their will be some restrictions and such but overall there aint usually much unless your into high performance.So mainly all these aftermarket parts and mods you do at your own risk,do some research dont just jump on the bandwagon and then have issues. I will never get a open atmosphere BOV unless it does what i said before and that is just get rid of the excess air as fast as possible,same with a external wastegate,and obviously make sure it aint leaking like yours..
BillyBobBizWorth 1 year ago
LOL one more thing is that, open atmosphere BOV's give you worse performance generally overall unless they do what they are meant to, and that is get rid of that excess air as fast as possible, none of this having a BOV to have a cool sound coming from it, if looks and sounds if what your after from a car and aftermarket parts then so be it, but dont come crying in forums when you cars running all shitty and you cant figure it out, car manufacturers spent alot of time and money on their cars...
BillyBobBizWorth 1 year ago
On top of that the only reason that a BOV would have a filter would be so if you BOV does leak air or intake air its going to be filtered not dirty, just like a filter on a oil catch can does, incase it intakes after a pressure release.
Anyways i hope you take in the information everyone has told you because they arent lying to you, i think you are misinformed or need to think before you speak about things alot of people know about.
Are you a customer or the mechanic at that workshop?
Cheers
BillyBobBizWorth 1 year ago
Hey Synaptic, im not here to judge you like other people have but they are right, its a open atmosphere BOV because it releases the excess air back into the atmosphere where as stock/recirculated/plumb back BOV will put the air back into the intake system so BOV leaks arent as major problem as a open atmosphere, but it is still a problem(diaphram/plate or spring) and should be fixed for it to operate properly.
BillyBobBizWorth 1 year ago
EBAY junk BOV
vlcalais2turbo 1 year ago
Can I get this straight you are proving that you don't need to filter your BOV by showing that your BOV is leaking?
Sarumatix 1 year ago
@Sarumatix It isn't leaking pressure, it is in bypass mode under high vacuum, which unloads the compressor and eliminates unneccessary backpressure when the demand isn't there. Once the intake manifold goes to -2" of vac the BOV is closed in order for the system to build pressure.
SynapseRawUncut 1 year ago
this guy has no clue, maybe he should read up on the purpose of a BOV. what a joke.
HardstylePete 1 year ago
@HardstylePete I design them for a living, tool. You should read up on how an internal combustion engine actually works.
SynapseRawUncut 1 year ago
@SynapseRawUncut man you are a fking joke dude, if you think a BOV is supposed to open on idle go back to lego. this video has been posted up on forums, everyone is laughing at you.
HardstylePete 1 year ago
@HardstylePete wow, I doubt you'll ever be aware of the level of ignorance your assumptions are keeping you at. Ask any OEM engineer and they'll tell you that their designs operate with the DV open at idle = high vacuum. After market designs don't know what they're doing so they overspring the BOV/DV. You and the other ignorant posters are the % of customers that we don't want, thank you for self-filtering, no pun intended.
SynapseRawUncut 1 year ago
@SynapseRawUncut the point of a large spring is to allowed for increased boost pressure over stock. if the BOV is open at any point, pressure is escaping the intake thus the turbo isn't working. Pressure should only be released when there's a sudden drop in pressure between the intake manifold and the intake piping. also, the whole suggestion that a BOV requires a filter is just retarded, the BOV is a one way valve, air should never enter the BOV since it should only open to release pressure.
HardstylePete 1 year ago
@HardstylePete After market companies need large springs because they don't actually know how to design the device properly. Watch the vids under our rawuncut channel and you'll see that a leak-free design under boost is our top priority. There is a difference between bypass under vacuum & being leak-free under boost.
SynapseRawUncut 1 year ago
is getting a bov on my automatic 335i pointless? I like the sound of it, is that stupid?
fafinaf 1 year ago
@fafinaf the 335i uses the Bosch diaphragm DVs. Eventually they fail at the diaphragm and you get a leak in boost with a gradual reduction in overall performance. It is a good idea to get rid of them.
SynapseRawUncut 1 year ago
ok im lost , dont you need the valve closed at idle and on load too????
SPANKY714AHM 1 year ago
BOV's aren't supposed to vent air at idle or at WOT! They vent the excess pressure built up from the turbo when you back the throttle off. At all other times it should be closed. Why is this one open but every other BOV manufacturer on the market would be closed at idle? It's as if this BOV has been put on backward so to speak. Saying it's the turbo being so efficient is a load of cr@p, your BOV doesn't care how efficient your turbo is, it's only function is to dump the air. this is BOV FAIL!!
slinky97 1 year ago
Whoever thought they needed a filter on their BOV is a retard, i'm mad you had ta explain that....nice explanation though, and nice car
snowmanii 1 year ago
No it's not a boost leak, it's just a leak in general, even at idle or cruising throttle air is being drawn in to the intake and If the bov is letting some of this air escape, that, children is called?.... Yaaaaay a leak!!!!!...nice try tho...
Dert666 1 year ago
Very nice setup, should eliminate surge and help linearly degrade lag. I think it would help decrease the retarded youtube comments if the operation was explained a little more.
1. Discharging boosted side air at vacuum reduces "backward" pressure on the turbo, reducing lag.
2. HELD OPEN operation at vacuum allows all high boost air to be expelled almost immediately
It operates almost exactly like the surge valve setup on most centri units
nuclearmuscleX523 1 year ago
Can we say....DUMB ASS!!! This turbo is "acting like a centrifugal blower. It's blowing TOO MUCH air at idle, therefore it needs to be vented. Once the car goes WOT the valve THEN shuts and is sealed so the car can build boost. This isn't for every turbo charged car out there, but since this particular car flows so much air at idle, it needs to be setup like this
sgod1100 1 year ago
dumb ass jap!!!!
mazawalt 1 year ago
there are no pro drift, drag, or autcross racers that use thise product, if it was so amazing why is nobody but suckers using it? I'm not here trying to start fights my point is, nobody has proven otherwise...
Dert666 1 year ago
and these guy cant afford to get their product out there besides FREE youtube videos because?...ya, thats what I thought...
Dert666 1 year ago
umm... shouldnt the waste gate open up to regulate the pressure the turbo is creating. not the blow off valve. i was under the impression that the blow off valve releases the pressure between the manifold intake and the engine, when the throttle is released. the only thing that should stay open like that is the waste gate valve which regulates the pressure in the engine. not the bloody blow off valve O.o
sickgr33k 1 year ago
when you say
mkrv4jtta 1 year ago
@mkrv4jtta when you say bypass valve you are referring to a diverter valve, found on most turbocharged vw/audi. this diverter valve is recirculating metered air (MAF). at idle this "bov" or diverter valve is open. the vacuum from the engine keeps this valve open at idle (hence the vacuum line going to it).
mkrv4jtta 1 year ago
@mkrv4jtta only when the engine/ diverter valve reaches 0in of vacuum does this valve close (thats why the spring is there), and thus holds boost. When the car in the vid is at "highway speed" the engine is probably at about 20in of VACUUM with little to no load being applied to the engine.. Just because one engine works one way, that doesnt mean that all engine work in the same way
mkrv4jtta 1 year ago
@mkrv4jtta bunch of ricer
mkrv4jtta 1 year ago
@mkrv4jtta actually if you are at highway cruisings speed and your boost gauge is at 20vac, you have an issue, normal cruising vacuum on a turbo vehicle is 99% of the time 10-15vac, its only when throttle is let off and more vacuum is drawn that you reach 20, cruising should NEVER be at 20 vac, I'm not here to argue how great or not great this product is,
Dert666 1 year ago
all I'll say is, its been out for over a year and I have yet to see it in any reputible auto magazine, if it was as great as it is claimed you would hear ALOT more about it, and see adds everywhere like you do other brands (and alot of these "other brands are garbadge IMO")but you dont so I'll leave it at that, good day
Dert666 1 year ago
@Dert666 , most automotive magazines are payed by companies to showcase their products.so your "Reputable source" idea is null.
mediarocker543 1 year ago
@Dert666 well, u get my point, it will still be in vacuum, thus keeping the valve open
mkrv4jtta 1 year ago
And a supercharger doesn't bypass the air into the atmosphere it recirculates the air through the supercharger. So maybe u should have a hose connected to that bov or u are gonna have more turbo lag than if it wasn't open.
Chevymonster203 1 year ago
I think everybody needs to calm down, And for all you idiots saying it is making boost at idle then it would be closed because the boost coming into the hose connected to the blow off valve would push the valve or diaphram closed. No it shouldn't be open, there should be no air leaks in the intake tract. Some blow off valve's come with interchangeable springs or a screw to put more tension on the blow off valve. I think thats the case here.
Chevymonster203 1 year ago
wtf chink face fix da bov n ur turbos u stupid gook omg its a blow off not a leak off omg n fuk bmw get a skyline 2010
carguyturbo 1 year ago
Thats the first dyslexic BOV I've ever seen, and here I thought my irish wife was the only one who did things backwards
Menace2Sobriety83 1 year ago
Shouldnt it be closed while revving so it can build boost??
quadracer111 1 year ago
ummm...revving an engine doesn't put it "under load on a freeway", unless you're running it on a dyno.
OKredneck 1 year ago
this is retarded.....
twistymcslide 1 year ago
hehehehe bov
enzo1392 1 year ago
not too many of you guys, know how the euro turbo cars work. the bov's/dv's stay open untill there is enough pressure, to close it to make boost. its just how they Germans designed things. and he never rev'd the motor to make enough pressure to close the valve or the wastegate
scoobydoo41787 1 year ago
lmao thats called a boost leak homie... not a good thing
RMena64 1 year ago
fail
TarisRedwing 1 year ago
lol BOV is leaking hard lol.....the bov should be closed so you could acumilate boost....thats why u got a wastegate actuator....really...a bov releasing air lol and i thought my GF was retarted lol
johnnydogg87 1 year ago 11
just to let you know you are in fact, an IDIOT. i have a procharged harley and that is exactly how it works!!!! the wastegate is to regulate boost not to say when it's supposed to come on or off. Once boost comes on it forces the BOV closed. why don't you learn some shit before you start talking some shit!. yup your GF is probably retarded!!
sgod1100 1 year ago
well, first off your GF probably does RIDE the special bus. Secondly I have a procharged harley and that is exactly how it's supposed to work!! the wastegate is supposed to regulate boost not determine when it comes on or off!! Once boost is started the BOV is closed!!! Why don't you learn some shit before you start talking some shit!!
sgod1100 1 year ago
you said pro charge...in this case this is turbo charged and i have myself a mazdaspeed.maybe in the set up of your harley is different from a car but my car the BOV has to be shut even on idle and as you could see in the video he accelerates and more air comes out....and yes wastegate regulates the pounds of boost depending how hard the spring is but it also releases the boost when you let go of the gas that's why theres a little switch in the turbo were you hook it to.stop talking shit dogg
johnnydogg87 1 year ago
@johnnydogg87 listen to how he says "and now under load on a freeway it's STILL blowing air out" lol! he might as well have said "its STILL LEAKING LIKE HELL!" LOL!
smtbbo 1 year ago
wow, what a failure. enough efficiency, your blow off valve is stuck open when the motor is running, BOV's are supposed to close so you can buiild boost, instead of spraying it out of the bov.,
ajbauto 1 year ago
Can we say BOOST LEAK!!!
MortuusImmortale 2 years ago 19
Seriously? Would this product even work if there was a boost leak? Educate yourself on how an engine works.
synaptic1 2 years ago 12
seriously??...this is not a boost leak. rev your turbo charged car to lets say 3500rpm. what does the boost gauge say?? it certainly doesnt go into boost, just more vaccum
mkrv4jtta 2 years ago
@synaptic1 how is that a BoV? the BoV is used to release exess boost after the throttle is let off... why is this one staying open? Wouldnt that make it so it could not build up pressure?
Tj1056 1 year ago
@synaptic1 Lol the Product is the boost leak you fool!
BillyBobBizWorth 1 year ago
@BillyBobBizWorth ok a couple things 1) if the throttle shuts and stops providing vacuum to the bov the bov would close 2) map and maf do have the same idea but how they function are completely different (thus they react differently to boost) see the map reads manifold pressure (and is located on the manifold) the maf is going to read the actual air flow (this would be located in most cases right after the air filter
trdnismoguy 1 year ago
@synaptic1 What do you mean? it's leaking air even in light load. so it will be leaking boost when it starts boosting... boost leak...
The turbo spinning plays a big role on how the car feels in the non-boost area... you don't want to have a leak like this under vaccum.
minusxp 1 year ago