Popping or Backfiring

[The_Beast]

I just put my headers and new exhaust (TSP Rumbler) on and when I let it coast in gear it pops really loudly, like its backfiring. It did this before I put the headers on when I was running no muffler. I thought that the headers, no cat, and a muffler would make them stop, but it hasn't. Also, my old exhaust pipe had a huge hole right after the cat. I'm assuming thats where the popping was taking place. Anyone have any ideas what this could be or how to stop it?

[Meatyshells]

Re: Popping or Backfiring

you just dont have enough back pressure, its not hurting your car any. if you dont like you, get a more restrictive exhasut

[The_Beast]

Re: Popping or Backfiring

I don't know if I'm explaining it correctly. I know that theres a normal amount of popping going on when you let off the throttle in a M5, but this is a huge pop. It sounds like a backfire. And it did it with my 2.5" system with a cat. I'm beginning to thing new plugs and wires, but I just wanted to see if anyone had any info or experience on this.

[xmetallicaxguitaristx]

Re: Popping or Backfiring

That's normal for open exhuast isn't it?

[kristen]

Re: Popping or Backfiring

should have done a read up on the exhaust before you got it. kinda sucks!

[Smoke Panther]

Re: Popping or Backfiring

you just dont have enough back pressure, its not hurting your car any. if you dont like you, get a more restrictive exhasut

No. Popping is from unburnt fuel getting into the exhaust and igniting. when you let off the throttle, you have a lot of fuel that just went into the motor, but not as much air, causing a rich mix that doesn't get burned completely. ways to reduce this is a stronger ignition and tuning.

[The_Beast]

Re: Popping or Backfiring

Should I run hotter plugs? What would you recommend for stronger ignition?

[IDoVoodoo]

Re: Popping or Backfiring

it's because you have a 3 inch exhaust with no "real" muffler. those dynomax bullets are great w/ another muffler to tone it down but they really do nothing by themselves.

[Moses]

Re: Popping or Backfiring

No. Popping is from unburnt fuel getting into the exhaust and igniting. when you let off the throttle, you have a lot of fuel that just went into the motor, but not as much air, causing a rich mix that doesn't get burned completely. ways to reduce this is a stronger ignition and tuning.

+1 mine does it too with open downpipe. It did it with the stock exhaust too. Just not as much. The reason it's so loud is because it's less restricted to allow sound travel better and the sound.

[FunkZ]

Re: Popping or Backfiring

Mine does it too. It sounded okay with just a cat-back. Once I added cam and headers it is waay worse and snaps/cracks pretty loud. After a few seconds off-throttle the injectors shut off and it stops. I just try not to let it wind down from high rpm's and it's not as bad.

[oakleyR97S]

Re: Popping or Backfiring

ive got a friend that has an 04 gto and it pops... A LOT...
i kno the sound ur talking about

whenever he down****s it pops and snaps, its a mix between backpressure and the vehicle running too rich, example : he shoots flames out his exaughst once in a while

i hav a 3 inch pipe all the way back with no o2 sensors or a cat, but a delta flow muffler with a lil bit of engine work done, mine pops 2. if i had a tune it prob. wouldnt do it...

[Disruptore4]

Re: Popping or Backfiring

i have the magnaflow 2.5" cat back, magnaflow hi-flo cat... does the same thing, no worries :banana:

[MIKE1stcamv6]

Re: Popping or Backfiring

i rather have snap-pop-farts then rasp but i got both so

[runtwrestlin]

Re: Popping or Backfiring

Ehh, mine backfired yesterday when I went to crank it in the parking garage...scared me pretty good. Since it's never done that before I thought I had totally broken something. As for doing that in gear....no, just rasp and some slight popping. Like you said letting off the throttle slower seems to ease that. But since I jsut have a catback, your "pop" is prolly a lot louder than mine.

[Loochy88]

Re: Popping or Backfiring

my Z pops like mad on the highway. im putting headers and an ory on it soon, im sure it will be even louder.