backfire problem
 

well while i was at school (during lunch) one of my freinds wanted to se me drift and do some donuts in the parking lot of the school so i do a couple, and him being completly clueless when it comes to cars says "i like how u make the fire come out ur muffler" of course hes talking about my car backfiring. so i check all my seals and there all ok so wat i wana know is can anyone tell me wat might be causing this cuz from my understanding backfire is bad

With a rotary backfire/"spitting flames" is normal. Especially if you're doing donuts and staying in the higher revs. Being that you're dumping quite alot of gas in to the combustion chambers.

not necessarily. backfire, afaik, is caused by unburnt fuel in the exhaust gases being superheated and thus being ignited. a lot of tuned/ported 7's will shoot fire. rx7's already run a bit rich, so it sets up good conditions for this, heh.

to the others that read this, correct me if i'm talking out my ass.

if u have no cats then thats why dont worry about it and enjoy it it is a RX7 quirk that most people love

Nothing to be concerned about. I have no cats o my FC and it shoots flames in the high revs often. I consider it a bonus!

Sweet, not cat for me! haha! Aye does the racing beat exhaust system have a cat! or is the presilencer replace the cat or act like a cat?

Bah, I have no cats/emissions removed and my 7 won't shoot flames for the life of me. What am I doing wrong!?

;)

im pretty sure that it replaces the cat i have a corksport so dont quote me on that

^^^remove the airpump or just take the belt off...Block off the ACV and gut your cats or just get a good exhaust system and there you go

Done, done, done... no boom boom. :(

i dont think mine shoots flames, but if I rev it to anything over 4k and let off and keep reving it to that and letting off so it sounds like it is hitting a rev limiter, it will kinda do a little backfire out the exhaust, kinda like a pop, every time I hit the gas to go back up. If I go really high like 5k in a gear and shift into the next and dont get on it at all, it will backfire and sound like a shotgun going off. it.CLICK HERE for video

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Yeah they'll do that.[/Homer Simpson]