GFB BOV Diverter or Blow-off valve spring adjustment www.gfb.com.au

[countryboyG]

I just put a type s bov look alike greddy type rs type bov on my car and adjusted the screw out almost the whole way untill there was no tension on it and when in park i pushed the gas and you could hear the turbo flutter but i took it out on the road and at about half boost it seems to be letting out all the pressure what am i doing wrong here? D:

[eak848]

@countryboyG you need to screw it back in! you will fuck your turbo

[countryboyG]

@eak848 if i would put any tension on the springs in the bov the turbo would flutter when you let off the gas but anything over half boost it would let out all the air and run like shit so i tried taking one spring out and that didnt work i tried switching it with the other spring that didnt work so i put the original one the car came with factory and the car runs great :p

[eak848]

@countryboyG yea i had the same problem with a greedy type s bov shit bov's. im now using gfb maxumis best iv ever used dose what its ment to!! lol

[countryboyG]

@eak848 yeah thats what i had on my car too but im trading my car for a mustang so it dont matter much to me any more :p

[josjosjoj]

I couldnt hear well, you said turn the spring control clock wise 80 ....?

[gfbvideos]

@josjosjoj - what time in the video are you referring to?

[josjosjoj]

@gfbvideos.. between the first 20 seconds

[gfbvideos]

@josjosjoj - ok, says to find the softest spring pre-load setting to begin with, by turning the spring adjustment anti-clockwise until it stops - this is the softest setting and the point that you should start. Then make adjustments clockwise as per the rest of the description.

[rowham1]

i wish it was this easy on an s15. mounted in stock position it is totally hidden. plus on the sr20 there is literally zero boost made on idle so the piston doesn't vent. so yeah, no way to set it until you drive and test drive and test drive

[gfbvideos]

@rowham1 You can still set the spring like this on any turbo car - the WRX doesn't make boost in neutral either, but the turbo still spins enough with a good hard rev to push air. Setting the spring has less to do with boost, and more to do with the idle vacuum. You are effectively tuning the spring pre-load to match the idle vacuum. That way, only a very small amount of boost will open the valve when the throttle is shut.

[rowham1]

@gfbvideos ok thanks, i actually should have said 'neutral' not 'idle', but the only trick now then, is to somehow be able to see the piston as i'm adjusting it. Being positioned under the fuse box, and the trumpet facing the wheel arch, plus the battery has to be taken out to actually see the BOV haha....this is very tricky still.

[rowham1]

@gfbvideos sorry also forgot to say...i have the gfb respons

[gfbvideos]

@rowham1 Ah, yes - very true! I'd say set the adjustment so the top of the screw is about flush with the top of the valve, and that should be ok for the S15. If you free rev it in neutral, you should hear the valve vent, and if you hear the revs dip when it comes back to idle, give it another 2 turns. As long as it comes back to idle nicely, it should be fine.

[rowham1]

@gfbvideos great that was probably all i needed to know, i set it flush and it is not messing with the rpm on idle at all. job done. it has allowed my car to hold boost like it should have been. 17psi on the dot. fixed my issues of the stock valve leaking back to 14psi. very happy.

[Baienziichter]

Are there existing flutter Valves, where, witch,what is it called??

[Northiee]

@Baienziichter There is no BOV that is made to make a flutter noise. I know it may sound good but there is a chance of damaging your turbo if you're running a small one.

[patrickryan814]

I have an 05 jetta GLI and everyone says go with a dv instead of a bov can u tell me the difference and which is better for my car?

[timorbit]

[2/2] so if you have a BOV that vents that air to the atmosphere, the engine is going to run rich for a moment because the car vented intake air to the atmosphere while the car still thinks it has that air (and is adding necessary fuel for that air). GFB makes a dual port BOV so you can vent some and recirculate the rest. That type of hybrid is great for those with a MAF sensor but wanting the VTA sound.

[timorbit]

@patrickryan814 [1/2] A lot of people use diverter valve (DV) and blow off valve (BOV) interchangeably. Basically a DV just recirculates the intake air from the post-turbo side to the pre-turbo side (diverting the turbo in this air movement). A BOV will simply vent the post-turbo intake air to the atmosphere. Whether to use a DV or BOV depends on the car. DV is important when your car has a MAF sensor prior to the DV, because the engine adds fuel based on what the MAF sensor detected came in;

[mtbryder21]

sti/

[MrLillskiten]

turn on the fucking engine..IDIOT!!

[jasantony]

hey can my 90 acura integra 1.8 have one of those.........

[02midnitebluewrx]

"can my integra 1.8 have one"

hahah

[jasantony]

ok u dumb shit to start off it was my stupid friend who used my computer........

[slimshadie1290]

Great thanks!

[lowprofile509]

bloody mate!

[adamgm84]

excellent tutorial, this should be all i need to adjust my blitz ss

i got a bit of compressor surge since i added intake and downpipe

[makaveli828]

wow on my turbo 4.6 mustang i have the bov all the way hard and i thought the noise sounded so nice!! sucks that im looking to get rid off the noise now

[dutchfreaker]

thats just a stupid comment

you have just been lucky you prob had a lott of people to teach you

most of us learned true experience exct

thumbs down for you kid

[DSB1234567890]

Nice vid, very useful!

The reason why BOV's are only needed for turbos and not superchargers is that a turbo wheel keeps spinning a bit after the engine slows down, trying to pressurize the closed intake. This is bad for the turbo, or at least bad for performance. A supercharger is direclty linked to the engine, so when the engine slows down it immediately stops pressurizing the intake.

[gfbvideos]

Hey DSB1234567890,

Glad the video was useful.

In regards to superchargers, it should be pointed out that centrifugal superchargers do need BOVs, because unlike positive displacement blowers they are connected to the intake before the throttle, like a turbo. Therefore when the throttle shuts, pressure needs to be relieved. However, on a roots blower (positive displacement) for example, you are correct - when the throttle closes the supercharger's intake is throttled, negating the need for a BOV.

[DREMERR]

ok...thanks man!!! awsome vid!

[cadeMFjohnson]

actually most roots and twin screw systems have an internal diverter.

[gfbvideos]

In regards to compressor surge, it is true the valve should be adjusted correctly to prevent it, however I wouldn't agree that it kills motors - in very extreme cases it can damage turbos, in less extreme cases it can accelerate wear on the turbo bearings, and in mild cases (a couple of huffs at light load and low RPM, which is not uncommon) it would not be a concern, when compared to the other conditions that a turbo is subjected to day in day out.

[DREMERR]

its possible to install a BOV on a car without turbo???

[gfbvideos]

No, well yes, it is possible, but it wouldn't do anything! There needs to be pressurised air for the valve to vent, and without a turbo or supercharger there is no pressurised air.

[jordopatrol]

awsome vid very useful

[sallad5]

or does it just have to be a car with turbo?

[gusu666]

Turbos or certain super chargers though on a super charger it would serve no purpose other than to sound cool. Blow off vavles should only be put on turboed cars. Also they should always be adjusted correctly to avoid compressor surge which kills motors and turbos. A tip with a BOV is to never go for a cool sound but to go for what works best with your car. I don't know about you but I personally don't want a new turbo and motor every few weeks just to "sound cool".

[sallad5]

is it possible to install the Stealth FX on every car?

[chevrolet37]

are gfb good quality parts?

[gfbvideos]

The best there are! In the unlikely event that you do have problems, our customer service is also the best you'll come across. If anyone says different, they've never dealt direct with us!!

[1kera]

cool