What causes exhaust flames?

[Matthew]

The guy in the VR6 i raced said i had flames coming out my exhaust when i passed him during the race. he knows less than zilch about cars, but im curious to see if hes right what that means...

 

[changedman]

all the fuel isnt being burned. which means u must be rich as heck.

 

[Matthew]

better than being lean lol.

 

[SpicyMchaggis]

yeah, since i'm such a enviromentally friendly person, i put a 12V lighter in my rear section to ignite all my unburt gas..nice guys are rice guys.

 

[Striker187]

what pdh said. i take it you're running catless right? man i wish i could throw flames.....maybe i'll be cheap and get that bee-r rev limiter

 

[Matthew]

no i have one cat! lol! so its not dangerous? except to anyone trying to have a cookout behind me?

 

[Striker187]

you have a cat? hmm....haha, might wanna check it then. cause usually the cat will catch most of the unburned fuel....

 

[Matthew]

it might be gutted or high flow...it came withe the downpipe from mp3skater..i could be running rich as ****, but i cant really tell TOO much without a w/b because my fuel pressure gauge only goes up to 100...im guessing im running at least 13:1

 

[SpicyMchaggis]

I take it you have the rear cat..that would do a damn thing to stop blowback. I was running on just my front cat until i got my header and i was getting blowback real bad..(the jersey meet was a prime example) Now i just rip 3ft of flame at tailgating rice boys.

 

[Protege5Gurly]

Might not be either ... at Rev It Up last night there was a stock RX-8 drifting and when he would let off from doing a burnout he would dump flames --- it was SWEET.

Pe@ce

 

[Matthew]

well cool, im shooting flames...lol...but if i leaned out a little bit on my FMU couldnt i gain some more power? or should i just leave it the way it is until i get a wideband?

 

[Protege5Gurly]

Leave it

Pe@ce

 

[SpicyMchaggis]

don't leave it, its horrendus..mine is intentional. check the FMU..your running rich..keep your on the wideband..(if you have one)

 

[Matthew]

i dont for now so i should prolly just leave it until i get one and can tune it better. i rarely hit 8psi anyhow.

 

[changedman]

you could absolutely turn running way rich into more power with CORRECT tuning. that is vital. I bet with RIGHT tuning, running that rich, you could add over 10whp.

 

[Matthew]

you mean by STAYING rich or leaning out a little bit

 

[SpicyMchaggis]

i concur.

 

[SpicyMchaggis]

leaning it out.

 

[Matthew]

well the begi seems to be great for tuning (not as good as a standalone mind you, but also at like 1/4 of the price) so im sure if i talk to beau he can tell me what to do.

 

[Protege5Gurly]

Leave the damn thing till you get your wideband .. then start leaning that beast out!

Pe@ce