Backfire factors (Exhaust & Exhaust tip size?)
Feb 2, 2009, 02:29 AM
#1
Backfire factors (Exhaust & Exhaust tip size?)
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)
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)
Feb 2, 2009, 06:09 AM
#3
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)
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)
It's the difference in tuning and driving style.
Feb 2, 2009, 08:43 AM
#7
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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
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
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Feb 2, 2009, 09:14 AM
#9
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.
Feb 2, 2009, 09:22 AM
#10
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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.
Feb 2, 2009, 09:24 AM
#11
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running meth helps...you talking about this?
http://s383.photobucket.com/albums/o...drewflames.flv
http://s383.photobucket.com/albums/o...drewflames.flv
Last edited by Lancerguy'03; Feb 2, 2009 at 09:29 AM.
Feb 2, 2009, 09:44 AM
#15
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)
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)