I've been thinking a lot about this lately, as I see a lot of cars throw flames on every fast shift while others refuse to backfire regardless of anything.

As an example I'll put me and a friend. We both have the same exhaust, except he has a 100mm tip and I have a 127mm tip at the end of the exhaust. His car will throw big bangs whenever he hits 2step/revlimiter while driving, while mine won't as much do anything. Other power mods are pretty much the same. His car was tuned by another person and I know that's the biggest factor for sure, however the reason for opening this topic was,...

I'm wondering what impacts the car doing fireballs and doesn't.

(And no, this is not a rice question about "how I can make my car backfire", I know how to do that with a map, I'm just wondering what makes the difference)

 

i thought it depended on how much fuel you were running on the tune, and how much of that fuel was actually being used...the rest comes through and is lit in the exhaust causing the backfire.

 

It's the difference in tuning and driving style.

 

Having a test pipe should help with this

 

Forgot about that, that'd play a roll too.


P.S. I hope your names referring to the the best team in the NFL.

 

It all depends on your tune, if your running rich chances are you will throw a backfire

 

Higher boost + higher exhaust velocity (at higher rpm) - louder pop

More fuel (running richer) - bigger flame

Hotter exhaust temperature (if you drive much harder and/or longer, and usually on higher powered cars) - change in flame color, red -> orange -> blue

Narrower exhaust pipe (tip should not matter much) + higher exhaust velocity - better chance of you seeing the flame outside of the exhaust

Combination of high boost + narrower pipe - blow torch like exit, rather than cigarette lighter like

running cat would reduce the chance of seeing it as it filters a lot of crap that comes out which may help with the combustion

 

You can do it with just the tune mainly. Its just making it richer on what ever circumstances your looking for it to shoot flames and just make it richer and retard timing. I forgot someone said that they do this over in the ecu flash forum.

 

Let me stress this again, I'm talking about it happing "accidentaly", I know how to intentionally cause one, but it seems some cars like to explode more than others do. And to the obvious replies - yes, both cars have a 3" turboback with a testpipe.

 

my car will light up the sky at night time with its backfires lol i think its because its running to rich but its funny to see cars slow down behind me. i guess an rb25 with tp and exhaust doesnt smell or help either lol.

 

running meth helps...you talking about this?
http://s383.photobucket.com/albums/o...drewflames.flv

 

double post...

 

running rich = boom. My friend got tuned but clearly they didn't do a good job as he is running way too rich and every shift he backfires while my car runs perfect and no backfires.

 

meth
test pipe
vta bov
running rich (tune)
cone filter
driving style

 

BOV not recirculated will make a huge difference. Super rich condition for a brief moment.

My Type S lets out a tiny bit of air to make the loud whistle but the rest is still recirculated and I can hear it pop all the time. I'm thinking if it wasn't recirculated I'd throw flames. I can try if you want me to (aka give me a reason not to recirculate my BOV)