Backfire

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Oct 9, 2003 | 06:41 PM

TurboWrx

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Backfire

I have a TBE and uppipe using the stage 2 with uppipe Utec map. My question is, I seem to backfire alot, sometimes with a flame out the exhaust. Now this looks cool , but do I need to lean out my mix a little to stop it? Is it safe to be that rich?

Thanks..

Oct 9, 2003 | 07:25 PM

Uncle Scotty

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If you have an aftermarket 'BOV' venting to atmosphere, then you will blow fireballs, sometimes.
Venting to atmosphere causes a over-rich condition on shifting and excess fuel goes 'BOOM'....

If no BOV, then tuning is in order....Shouldn't hurt to be a bit rich..better than too lean.

Oct 9, 2003 | 08:39 PM

TurboWrx

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Yes my BOV is 100% atmospheric. Can the backfires harm my engine at all?

Oct 10, 2003 | 09:26 PM

navwrx

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I had the same problem. No cats, 100% bov. *** ton of afterfire. I finally got sick of it and just put my stock cbv back on. Havn't shot a fireball since. I guess venting it all off really does make you run rich. I don't have a utec though. So let me know your solution. I have a 200$ blitz paperweight on my desk that I'd like to put back on.

Oct 11, 2003 | 12:04 AM

Uncle Scotty

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You can't vent 100% to the atmosphere and NOT overfuel...thus causing the fireballs. Some 'BOV's" are 'tuneable' and allow the amount vented to be adjusted. This allows a 'happy medium' in venting and fueling. GFB makes one and Worxtuning makes another, there may be others but I don't know.
IMHO, the ONLY reason to use an aftermarket 'BOV' is if you HAVE to because you are using a FMIC or you are running over ~20psi. boost and NEED one.