backfire? - Subaru WRX Forum
 
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post #1 of 15 Old 03-01-2004, 11:50 PM Thread Starter
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backfire?

Whats the most usual causes for backfire? I was a little curious because ever since i put my downpipe on ive been having some backfire with perrrrrrrty flames out the back. Small flames yet still flames
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post #2 of 15 Old 03-02-2004, 12:43 AM
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you have a bov on your car?? if you do thats probably what is causing it
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post #3 of 15 Old 03-03-2004, 01:58 PM Thread Starter
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yeah i have a hks ssqv bov but why would that cause it?
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post #4 of 15 Old 03-03-2004, 03:12 PM
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No cats and a lot of gas cause backfires.

Che
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post #5 of 15 Old 03-03-2004, 05:25 PM Thread Starter
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yeah thats what i thought lol....... is that bad for my car at all? or more importantly, is it going to make it slower? and if so how do i fix it? i have an intake but I kinda rigged it to be a short ram for now, do you think i should just install all of it?
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post #6 of 15 Old 03-03-2004, 05:35 PM
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Nah install it as a short ram or dont install it at all. As for the backfires, they dont make you slower, and it's bad for the car if you are running rich, if not it's not a problem. Good for scaring the sh*t out of people.

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post #7 of 15 Old 03-03-2004, 05:45 PM
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well really you dont have to be running that rich at all.. since mostly all safely tuned subbies are on the rich side.. soo i wouldnt worry about it. Mine does it all the time and i have no cats..
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post #8 of 15 Old 03-03-2004, 08:45 PM
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What you're describing is technically called an "Afterfire". Caused when unignited fuel exits the exhaust valves and then ignites in the very hot exhaust piping. Not bad for the car if it isn't excessive.

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post #9 of 15 Old 03-05-2004, 01:37 AM Thread Starter
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I wish I shot flames like a roatry, let a mother ****** tailgate me again, then watch their grill melt
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post #10 of 15 Old 03-18-2004, 10:38 PM
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STI Backfireing

My buddy has an STI with downpipe Exhaust and whenever he lets off the gas it shoots a huge Asss flame.. is this bad for his car because he is obveisly running rich as heck...??
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post #11 of 15 Old 04-15-2004, 03:23 PM
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Thumbs up

my friend has a 93 Rx7, with down pipe, exhuast, no cats, power fc and it back fires all the time, with flames. It is also fast as hell
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post #12 of 15 Old 04-15-2004, 08:54 PM
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My car started afterfiring too even though I still have the midpipe cat. I have a txs bov and it seems to do it mostly when the engine is cold.

D
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post #13 of 15 Old 06-08-2004, 08:14 PM
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I'm not sure on this but I'm just repeating what I read. The computer is reading the air being dumped back into the intake with the stock dump valve. Well putting a atmospheric BOV vents to the atmosphere and all the air that the computer thinks it's getting isn't there. So basically less air with same fuel = unignited excess fuel.
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post #14 of 15 Old 06-08-2004, 08:24 PM
 
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Yup but its not that big of a rich condition because it only happens for a second, you really don't lose much performance if any. And it sounds sweet.
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post #15 of 15 Old 06-10-2004, 09:39 AM
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and its even more fun when you are driving down the street and you shoot a flame as you pass some little ricer kid and pulls up beside you at a stoplight and says "OMG you must be putting down mad power"
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