chevyss

Hey guys, just wondering if any of you have the same annoying exhaust popping that I am experiencing under deaccleration. I have the Corsa Sport cat-back exhaust and have already checked several times for leaks and everything is fine. The exhaust note sounds great until I let off the gas, then it goes from quality/ classy sounding exhaust to straight rice!! I do have the GMMP Stg 2 with a 2.9" pulley and I was already told that the GM tune was rich; could this be the cause? I also checked the gap size too and that was .039. Any suggestions or comments?

07cobaltowner

lol, most people like that noise, its just small backfires, nothing to worry about, as long as you have a Cat.

-Jayson-

i have pretty much the same setup and i get it every once in a while. No big deal. My exhaust is stock so thats prolly why i get it alot less.

2fastSS

lol i have the corsa sport also, and this is normal man, it makes the exhaust so distinct from any other exhaust.. I personally love the crackle it sounds oh so nice and not rice at all...Theres nothing wrong with your exhaust man

cobi

My GMPP performance does it and I like the sound

REIGN SS

my Pacesetter does it on my 2.2 also, i like it

im not sure how you deaccelerate, you can decelerate tho

chevyss

LOL...I think its funny as hell everyone loves that sound...haha..I CANT STAND IT!! I actually tack welded a CC insert in the exhaust before the resonator to help muffle the exhaust slightly; which helped a lot but its still annoying for me. My exhaust sounds so good when the engine runs cooler, but as soon as she heats up, forget it. I guess its just something I have to deal with, other than the pops and backfires the exhaust/car/SC sounds sick!! Definitely turns heads! I was just making sure it wasn't a tuning related issue.

p.s. With a header and DP installed, would this really intensify the exhaust note?

2fastSS

actually if you go with the gmpp manifold and a downpipe the crackle will lessen alot, the reason it baffles like this is because of our downpipe

Onyxd04Redline

Popping = Air in the exhaust system

chevyss

Could this be an exhaust leak....air getting into the exhaust system?

2fastSS

there is no leak man, believe me

a little trick you can do have a friend or two in front of the car and the side while someone takes a towel and covers the exhaust tip where no air is escaping that way it will come out where the leak is present believe me you wont find a leak

MaJ

My car does it, and I've only got GMS2. I noticed it very rarely before GMS2, but ever since putting on GSM2 is happens all the time. I also get backfires on 1-2nd shifts if I drive casually up to 4k rpm in first.

2fastSS

Your Cars Are Fine There Is Nothing Wrong Them Damn Haha

Blankobalt06

yeah mine does that too. I love it. Drop yours (those with auto) into intermediate and it'll be a little louder.

Onyxd04Redline

Air is simply getting into the catback exhaust. Probably at the downpipe connection.

My first car was a 1996 Camaro SS and the exhaust would pop all the time. Why? Air was getting into the catback at the Y pipe.

chevyss

That was my initial thought about the exhaust...I am going to have to recheck all connections. Thanks. But how does air get into the system when their are exhaust gases constantly flowing out? Does it create some sort of vaccum that sucks in outside air over a leak?

suprchged

if you think that is annoying i personally like the sound my self but thats all an SRT-4 does is snap crackle pops all the damn time

RedEcotecSS

header/downpipe would most likely make it do it more/louder. i love the noise personally.

Blown 4-banger

That is correct, its a mix of slightly fueled air making its way out the exhaust system with some combustion going along the way.

SRT-4 crack, because under decel, timing is retarded to like 2 or 3 degrees BTDC, so the fuel isn't igniting until its on its way out of the cylinder.

My car had absolutly no poping what so ever, with the 3" exhaust, backpressure was at a minimum, and I advanced the timing up to 35-38 degrees BTDC on decel, so by the time the exhaust stroke came, almost all the fuel was burned already. It would still pop occasionally, but that was usually just after letting off, on a high rpm run, and it usually was the flames poping, not the exhaust.

chevysalesman614

get a better downpipe. you're story sounds alot like mine, right before this happened :



then i got a header and downpipe, it stopped popping as much.. but it is louder.

1stbluSS

this thread is funny because everyday on my way to work i see a sunburst orange SRT-4 stg 2 in front of me and it annoys the **** out of me with all the crackles and pops. I was thinking man I love that car but that crackling and popping would get old.

chevyss

haha...I know...u can always tell an SRT-4, whether on or off the gas, they do sound like complete $ss!!....well that is off the gas, on they sound pretty good. Well soon enough I will be purchasing my header and DP, whether that changes teh flow, enhances the pops and farts, so be it!

CJ BadBlackSS

Stock SS/SC w/tune and I get teh crackle too...love that sound.

beercan

More than likely you guys are hearing afterburn .. its very common with f/i cars .. i could be wrong tho

2fastSS

what yall arent understand the corsa is know for this....few other exhausts do it, and i mean constantly when you let off the gas and just cruise....Theres nothing wrong