flame out exhaust

sti's do it when people mod the BOV, the stock bov on an sti works just fine for up to 400awhp, people like to hear the cute little chirp between shifts, this causes an extremely rich condition because the air is recirculated not vented to atmosphere, so its released back into the exhaust and usually reignites.i got it with a full catless 3" exhaust off turbo, hks resognator. i found it undesirable and after doing my homework on BOV's took it off my sti and returned it to the stock one.but that is with a turbo'd engine. If a stock G is doing it i would imagine its due to some sort of tuning issue.

and it will usually happen after holding a gear at a high rpm for awhile and upshifting, not upon the initial downshift.
 
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They do if you have a straight through exhaust. I was running lean though, so not sure about that.
 
I had a pretty much straight-thru exhaust (except cats) and I was running pretty rich. I remember reading that you were running lean and I thought that was a little odd.
 
True, but I'd thought that they were so rich to begin with that even with breather mods it would still be pretty rich as was the case with a lot of Altimas and Maximas (only really had experience with those. Well, and a few Titans)

Not discounting what you're saying in any way, I'm just surprised. Every car is different though. I can't wait until I can get some sort of tuning/monitoring equipment for the M because I can only imagine what the AFRs are in it.
 
You don't want this. This was happening on my GT-R...not cool. Running rich in the middle and a little leaner up top, when I shifted at redline all four pipes would shoot flames. I do have full exhaust...but a new proper tune took care of that!
 
Interesting.. it would be pretty cool for the FX to spark a flame after passing another car.
 
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