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Just thought I'd ask those who may know. Why do some cars backfire? (I don't mean when they have problems, like a beater) rather I mean like high-performance or race cars, such as cars in Formula One, WRC, ALMS, etc... What causes those engines to backfire that doesn't happen in a normal run of the mill engine, such as our beloved D17? Is it harmful to those engines, or is it just part of their high-performance nature?

 
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My friend has a camaro SS and it backfires cause the idiot doesn't change the oil...anyways, that's what he told me.

 
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Overcarburation(sp??) They tune their cars to run really rich so when its idling or when downshifting some unburnt fuel leaks into the exhaust then BLAM!! My dad had an old beater dodge van & he droped a 360 in it with dual glasspacks that came out right behind the doors, when he floored it & let off on an exit BAM! BAM! BAM! ...double barrel action baby

It was funny as hell, that van looked like **** but would own alot of cars.

 
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Wierd, when my 87 hatch used to run real low it just started tapping, then I knew I only had about a minute or so...hehe!! I was always soooo broke back then

 
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Backfiring system? what's the point in one of those?

 
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Since everyone else dragged this thread OT, here's your answer: http://www.rallycars.com/Cars/bangbang.html

For those too lazy to read, it creates exhaust gas while off throttle so the turbo stays spooled between acceleration.

 
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great link mystic thatnk you for posting it.

 
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Thanks for the link Mystic

 
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what fly said, but i think its called a misfire system. not a backfire system. it removes turbo lag.