that was the most boring video i have seen with an irocz post another one with it going down a road burnout first then running the car ALLOUT!! irocz fan here..........................
What do you have in her? Sounds just like mine! (probaly does sound the same as im running no muffler to (305tpi) check my vid out. Car looks good to!
well it seems you guys had fun going back and forth about back pressure thats awesome...a free flowing exhaust = more hp the cat and the muffler and manifolds and everything restrict hp i dont care what you say why else would you put bigger sized headers? if you run open headers you WILL gain more hp...maybe not as much on a bone stock car but if you have some other mods it will make a difference..i watched a 2000 LS1 trans am cam and full exhaust ONLY 392 RWHP then opened exhaust cutout 401RWHP
@Chevykidz28 yes it does help hp gain but the lack of back presure will screw you over if u plan on keeping ur car very long i've been there done that and well the car is nolonger with us. lol
You guys commenting, and thinking you know a little something about how exhaust gasses flow are totla morons. Back pressure is the ENEMY of power. Think for a second, when you're on the exhaust stroke, that piston has to work to push it out, more exhaust gasses in the way will only make it's job harder.
The power losses COME FROM BACKPRESSURE. It has to do with exhaust gas velocity. If you hack off your exhaust, you will have less velocity, and cooler exhaust piping, which means backpressure.
Whoops, leave it to me to typo when I'm calling people morons. *total* Oh well. Well kiddies, just make sure you know your shit BEFORE you post them idiotic ramblings.
Remember, backpressure is the enemy, and slow exhaust gas velocities are what will cause that backpressure. Hence power losses.
make sure ur makin enough backpressure.. wouldn't like to see you burn up the valves in it :) sounds good tho. the less backpressure you have the deeper it sounds but the worse it is for your car
Thats exactly why u lose it, that backpressue is what helps pull the exhaust from the next cylinder, but to much can work against u pushing back into the next pop, too little and and u lose that efficiency in working in perfect sync. think like a water mill, to many paddles and the water can't run smoothly, not enough paddles and the mill won't spin at max
Holy shit bigtony142, your backpressure rambling had to be the most pathetic one yet. Water mills, and paddles?
Backpressure is what helps PULL the exhaust from the cylinder? IS THAT WHY IT'S CALLED BACKPRESSURE?
Backpressure in exhaust systems = bad. Any damn noob knows that, it's common knowledge. Again, hacking off a muffler, yet retaining a stock exhaust diameter will cause the exhaust gasses to cool, resulting in slower flow, whichs means backpressure, that in turn, kills power.
When car makers make a car why would they purposely leave on a design that hinders performance, if they have that way, that have it for a reason, back pressure does pull gas from the next cylinder after it redirects toward the back end of the car, causing a good flow as you said I guess I should call it a vacuum pull, more or less I'm talking about a stock engine that can't adjust its fuel delivery. Simply put I agree with you on hacking a stock exhaust , if it was that easy there wouldn't be...
No, just forget it. You don't have a fucking clue as to what you're talking about. BACKPRESSURE DOES NOT PULL. It hinders exhaust gasses from taking the easiest path out, which is open space. Them gasses are forced out by the next gasses coming out of the exhaust valves, BACKPRESSURE DOES NOT HELP THAT. Backpressure puts more force back onto the piston, hence using the power of the upward motion of the piston, which is from the crankshaft. Therefore putting more force onto the crankshaft.
So your saying your smarter then every car designer out there? because you know their all dumb asses for using the same, as you say, flawed design for decades?
I don't recall talking or ever bringing up performance, I'm merely stating that in a stock engine, with stock exhaust, and stock exhaust manifold, they work better with backpressure rather then hacking off the exhaust itself
"So your saying your smarter then every car designer out there? because you know their all dumb asses for using the same, as you say, flawed design for decades?"
I totally agree with you on performance headers, but I've been talking about a stock manifold, never once did I say headers. Of course thats my fault I never specified until now which I was talking about
Well then again, you seem to think that backpressure pulls exhaust gasses out. That's like pushing all of your weight up against a door and expecting someone to easily walk out of that room.
On a fuel injected car, there actually may be small gains with an open manifold. On a stock type carbureted engine, most likely not. EFI engines can simply just adjust the fuel/air ratio so there are no burnt valves, and possibly a performance gain.
Ok Let me re-phase it, Its not so much pulling, I know it expands against the other cylinders but once it gets past that initial trapped phase and starts heading out the only exit it sorta creates a steady stream of gas follow which is ok for stock and for people who don't mind having a totally stock car, but as a racing fan I agree with you where back pressure is the enemy. Simply put I just wanna say don't hack a stock exhaust just get a performance exhaust system if you wanna gain HP
You're thinking of expansion pipes dealing with two strokes. They don't necessarily use the backpressure. They use the exhaust wave vibrations created in the expansion chamber by the gasses. It essentially forms a vacuum to suck out the exhaust gasses. It's needed to run more efficiently, since most two strokes that run expansion pipes are running well over 10,000 RPM.
I used to run my YZ250 with no silencer, just the expansion pipe, well head pipe, and I noticed a gain in throttle response.
not illegal in sc. if its too loud you might get a ticket, but its hard to see that a car doesnt have a muffler if you don't have vehicle inspections or emissions tests...
i took my cat off completly it goes straight into a flowmaster super 40 and believe it or not but i got a TRUE duel exhaust ran on it(took forever) and i love it
yea i am going to have the cut out welded in before the cat..and i am leaving it in...i dont need it for inspection because it is exempt from emissions...but i dont want it to sound to raspy
ur neighbors must love u
johno9445 11 months ago
hey do you want to sell this car ?
654378900 1 year ago
that was the most boring video i have seen with an irocz post another one with it going down a road burnout first then running the car ALLOUT!! irocz fan here..........................
streetbeat86 1 year ago
What do you have in her? Sounds just like mine! (probaly does sound the same as im running no muffler to (305tpi) check my vid out. Car looks good to!
IROCaTPI 1 year ago
@IROCaTPI in this video the car was bassically all stock just a cat back..just unbolted it to hear how it sounded
Chevykidz28 1 year ago
well it seems you guys had fun going back and forth about back pressure thats awesome...a free flowing exhaust = more hp the cat and the muffler and manifolds and everything restrict hp i dont care what you say why else would you put bigger sized headers? if you run open headers you WILL gain more hp...maybe not as much on a bone stock car but if you have some other mods it will make a difference..i watched a 2000 LS1 trans am cam and full exhaust ONLY 392 RWHP then opened exhaust cutout 401RWHP
Chevykidz28 1 year ago
@Chevykidz28 yes it does help hp gain but the lack of back presure will screw you over if u plan on keeping ur car very long i've been there done that and well the car is nolonger with us. lol
deb91250 1 year ago
whats up i sold my 85 iroc-z
Ls3guy 1 year ago
Sounds great
oR0UG3o 1 year ago
sounds like a beast man. nice IROC. lemme know when you get that cat out.
GramaroZ28 2 years ago
You guys commenting, and thinking you know a little something about how exhaust gasses flow are totla morons. Back pressure is the ENEMY of power. Think for a second, when you're on the exhaust stroke, that piston has to work to push it out, more exhaust gasses in the way will only make it's job harder.
The power losses COME FROM BACKPRESSURE. It has to do with exhaust gas velocity. If you hack off your exhaust, you will have less velocity, and cooler exhaust piping, which means backpressure.
kcole939 2 years ago
Whoops, leave it to me to typo when I'm calling people morons. *total* Oh well. Well kiddies, just make sure you know your shit BEFORE you post them idiotic ramblings.
Remember, backpressure is the enemy, and slow exhaust gas velocities are what will cause that backpressure. Hence power losses.
kcole939 2 years ago
make sure ur makin enough backpressure.. wouldn't like to see you burn up the valves in it :) sounds good tho. the less backpressure you have the deeper it sounds but the worse it is for your car
KCfan027 2 years ago
no, it will may sound sweeter, but u will lose hp w/ open headers.(don't really know how to explain it) u won't have the backpressure/flow
camaro88iroc 2 years ago
Thats exactly why u lose it, that backpressue is what helps pull the exhaust from the next cylinder, but to much can work against u pushing back into the next pop, too little and and u lose that efficiency in working in perfect sync. think like a water mill, to many paddles and the water can't run smoothly, not enough paddles and the mill won't spin at max
bigtony142 2 years ago
Holy shit bigtony142, your backpressure rambling had to be the most pathetic one yet. Water mills, and paddles?
Backpressure is what helps PULL the exhaust from the cylinder? IS THAT WHY IT'S CALLED BACKPRESSURE?
Backpressure in exhaust systems = bad. Any damn noob knows that, it's common knowledge. Again, hacking off a muffler, yet retaining a stock exhaust diameter will cause the exhaust gasses to cool, resulting in slower flow, whichs means backpressure, that in turn, kills power.
kcole939 2 years ago
When car makers make a car why would they purposely leave on a design that hinders performance, if they have that way, that have it for a reason, back pressure does pull gas from the next cylinder after it redirects toward the back end of the car, causing a good flow as you said I guess I should call it a vacuum pull, more or less I'm talking about a stock engine that can't adjust its fuel delivery. Simply put I agree with you on hacking a stock exhaust , if it was that easy there wouldn't be...
bigtony142 2 years ago
No, just forget it. You don't have a fucking clue as to what you're talking about. BACKPRESSURE DOES NOT PULL. It hinders exhaust gasses from taking the easiest path out, which is open space. Them gasses are forced out by the next gasses coming out of the exhaust valves, BACKPRESSURE DOES NOT HELP THAT. Backpressure puts more force back onto the piston, hence using the power of the upward motion of the piston, which is from the crankshaft. Therefore putting more force onto the crankshaft.
kcole939 2 years ago
So your saying your smarter then every car designer out there? because you know their all dumb asses for using the same, as you say, flawed design for decades?
bigtony142 2 years ago
No, what do you not get? Car makers DO NOT GO FOR PERFORMANCE. They go for quiet, emissions compliant vehicles.
Quit trying to turn shit around, I'm sure you read that just fine.
kcole939 2 years ago 4
I don't recall talking or ever bringing up performance, I'm merely stating that in a stock engine, with stock exhaust, and stock exhaust manifold, they work better with backpressure rather then hacking off the exhaust itself
bigtony142 2 years ago
With a manifold sure, but with headers? Nope.
"So your saying your smarter then every car designer out there? because you know their all dumb asses for using the same, as you say, flawed design for decades?"
That's what I was referring to.
kcole939 2 years ago
I totally agree with you on performance headers, but I've been talking about a stock manifold, never once did I say headers. Of course thats my fault I never specified until now which I was talking about
bigtony142 2 years ago
Well then again, you seem to think that backpressure pulls exhaust gasses out. That's like pushing all of your weight up against a door and expecting someone to easily walk out of that room.
On a fuel injected car, there actually may be small gains with an open manifold. On a stock type carbureted engine, most likely not. EFI engines can simply just adjust the fuel/air ratio so there are no burnt valves, and possibly a performance gain.
kcole939 2 years ago
Ok Let me re-phase it, Its not so much pulling, I know it expands against the other cylinders but once it gets past that initial trapped phase and starts heading out the only exit it sorta creates a steady stream of gas follow which is ok for stock and for people who don't mind having a totally stock car, but as a racing fan I agree with you where back pressure is the enemy. Simply put I just wanna say don't hack a stock exhaust just get a performance exhaust system if you wanna gain HP
bigtony142 2 years ago
You're thinking of expansion pipes dealing with two strokes. They don't necessarily use the backpressure. They use the exhaust wave vibrations created in the expansion chamber by the gasses. It essentially forms a vacuum to suck out the exhaust gasses. It's needed to run more efficiently, since most two strokes that run expansion pipes are running well over 10,000 RPM.
I used to run my YZ250 with no silencer, just the expansion pipe, well head pipe, and I noticed a gain in throttle response.
kcole939 2 years ago
@kcole939 exactly
whatthehallbetch 2 years ago
there wouldn't be performance exhaust created, plz I'm not a noob
bigtony142 2 years ago
wish my car was that clean and glossy. nice, better yet, bad ass ride. keep her purrying!
89madcam 2 years ago
taking that cat off will make it a lot louder
CardBoardPimp420 2 years ago
note to self... illegal in the state of california =]
LTCDINKINS 2 years ago
and in mass...
Chevykidz28 2 years ago
and in everywhere?
def in texas...
KBDB91 2 years ago
not illegal in sc. if its too loud you might get a ticket, but its hard to see that a car doesnt have a muffler if you don't have vehicle inspections or emissions tests...
zchris87v 2 years ago
lol indeed it is..thas y i keeps mine on =D
SgtSellz102 2 years ago
nice original irocz what is it a 85
eli310 2 years ago
its a 86
Chevykidz28 2 years ago
Comment removed
tansuperman06 1 year ago
@eli310 all 86's have the 3rd tailight on the back window
3rd4thgenFbody 1 year ago
nice camaro and sweet sound
fordsuckbigtime 2 years ago
ear orgasim. lol sweet ride
konadude92 2 years ago
your better off goin open headers
LT1TransAm95 2 years ago
i took my cat off completly it goes straight into a flowmaster super 40 and believe it or not but i got a TRUE duel exhaust ran on it(took forever) and i love it
calebdays 2 years ago
You're better off just cutting out part of the Y pipe and clamping the cutout in place behind the cat, so you don't get hassled with inspections.
kcole939 3 years ago
yea i am going to have the cut out welded in before the cat..and i am leaving it in...i dont need it for inspection because it is exempt from emissions...but i dont want it to sound to raspy
Chevykidz28 3 years ago
nice 86 iroc-z
ls6guy 3 years ago