Headers and backfire???
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Joined: Aug 2001
Posts: 75
Likes: 0
Re: Headers and backfire??? (SurfnSun)
Yep, you will get backfire. The stock prom has extra fuel added for the cats and it runs rich. When you remove the cats and lessen the back pressure the exiting spent carge contains some unburnt fuel. This fuel builds up rapidly when you are under hard acceleration and let off suddenly. When this occurs you the unspent fuel in the exhaust will eventually ignite and you will get the characteristic backfire. This can be eliminated by chip tuning.
Burning Brakes
Joined: Aug 2000
Posts: 1,026
Likes: 0
From: Gravois Mills, MO
Re: Headers and backfire??? (zr1son)
Yep, you will get backfire. The stock prom has extra fuel added for the cats and it runs rich. When you remove the cats and lessen the back pressure the exiting spent carge contains some unburnt fuel. This fuel builds up rapidly when you are under hard acceleration and let off suddenly. When this occurs you the unspent fuel in the exhaust will eventually ignite and you will get the characteristic backfire. This can be eliminated by chip tuning.
Race Director
Joined: Dec 1999
Posts: 10,230
Likes: 885
From: Alexandria, Virginia, USA VA
Re: Headers and backfire??? (Barry94TorchRed)
good chip guys
Marc Randolf (too busy for a while)
SGC Aaron Scott
ZR1 (jim milstead)
Ron Zimmer
and recently added to the bit twiddlers
Marc Haibeck
all these guys seem to know what they are doing.
the"closed throttle" fuel is really the problem, and all that fuel going into the exhaust doesn't really hurt anything, it's just annoying.
with the "bullet cats" this doesn't happen too bad.
I'd be interested in the chip mod too.
let me know who you go with. I have some chip tuning chores to do as well.
Marc Randolf (too busy for a while)
SGC Aaron Scott
ZR1 (jim milstead)
Ron Zimmer
and recently added to the bit twiddlers
Marc Haibeck
all these guys seem to know what they are doing.
the"closed throttle" fuel is really the problem, and all that fuel going into the exhaust doesn't really hurt anything, it's just annoying.
with the "bullet cats" this doesn't happen too bad.
I'd be interested in the chip mod too.
let me know who you go with. I have some chip tuning chores to do as well.
Race Director
Joined: Jan 2000
Posts: 10,379
Likes: 3,387
From: Central TX
C5 of Year Finalist (appearance mods) 2019
Re: Headers and backfire??? (Rkreigh)
Must not be a problem for all ZR-1's w/headers as my car has never done it. I've been in a few other header-equipped ZR-1's that wouldn't,either. Strange,huh.
