Hey guys, is it bad on an engine to backfire? Like when you shift hard without a cat and it backfires? Or when I hold in my 2 stage rev limiter and floor it and it lays one fire after another in rapid secession out the greddy muffler... Is that damaging to the engine or just the exhaust? I always throw flames at night time after I get done whoopin' on whatever pulls up, but never have known whether it is harmful to my exhaust valves or anything?
#11640, "RE: Backfiring? Good or Bad?" In response to Reply # 0
With a rev limiter, this is normal. I think the only thing that could be damaged by it would be the cat, but since you don't have one..
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#11642, "RE: Backfiring? Good or Bad?" In response to Reply # 0
nah. you are probably just running SUPER rich. I remember MuRiX's car woudl get a bit of aterburn between shifts as well (no beckfire becasue of the cat 'though). my car doesn't do that fo rsome reason. the only time my car shot fire when using the two sage rev limiter was when my intake cam was off a tooth (car was uncanny laggy). if it is making the right ammount of power, it is probably fine 'though.
bring it on............
A.D.P. "...If you do too much, people become dependant. If you do to little, people loose hope. If you do it right, people won't be sure you've done anything at all." bring it on...........
Perf: KYB AGX Struts Neuspeed Sport Springs 5 Strut Bars (2 F/U, F/L, R/U, R/L) Sprint Front Camber Kit $15 Rear Camber Kit Corbin's A/F Gauge MSD DIS-2 Ignition System Some Regrind Cams that need High Compression (which I don't have) Ported Intake Manifold Ported Throttle Body Drop in K&N Filter and open airbox Custom 2 1/2 inch exhaust with Dual DTM Muffler Empty Catalytic Convertor Energy Suspension Motor Mount inserts Hurricane_GS Short Shifter Symborsky Shift Kit Clutchmasters Stage 3 Modular 225/50/16inch Wheels and Tires
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Flame Red SRT-4 GT40,8.5:1 Built Shortblock, Brian Crower Stage 2 Cams, etc etc etc...
#11646, "RE: Backfiring? Good or Bad?" In response to Reply # 6
Most aftermarket ignition systems have a 2 stage rev limit in it. The first rev limit is set for normal driving. The 2nd for launching at the track. I would launch with mine at 4500rpm at the track. The ignition system drops the spark to 1 cylinder at a time to hold the engine at that set rpm. The fuel still goes to the cylinder but no spark so the fuel goes out the exhaust and sometimes it can be lit in the tail pipe and cause backfiring.
Perf: KYB AGX Struts Neuspeed Sport Springs 5 Strut Bars (2 F/U, F/L, R/U, R/L) Sprint Front Camber Kit $15 Rear Camber Kit Corbin's A/F Gauge MSD DIS-2 Ignition System Some Regrind Cams that need High Compression (which I don't have) Ported Intake Manifold Ported Throttle Body Drop in K&N Filter and open airbox Custom 2 1/2 inch exhaust with Dual DTM Muffler Empty Catalytic Convertor Energy Suspension Motor Mount inserts Hurricane_GS Short Shifter Symborsky Shift Kit Clutchmasters Stage 3 Modular 225/50/16inch Wheels and Tires
Audio: Alpine CD Head Unit Alpine Flex4 25W X 4 for Fronts and Rears Alpine V-12 450W X 1 for Subs Infinity Reference Series 5 1/4 and 1 inch tweeter component systems for fronts and rears Blaupunkt 3 way 6x9's in the rears 3 MTX 5000 10" 12 ohm subs running 4 ohms mono
Flame Red SRT-4 GT40,8.5:1 Built Shortblock, Brian Crower Stage 2 Cams, etc etc etc...
#11647, "RE: Backfiring? Good or Bad?" In response to Reply # 7
Well, good to hear it's not damaging, cause I love blowing flames at people. Do you think with proper dyno tuning, I will get rid of the backfiring after hard shifts? I just like to put in the clutch, and hit the rev limiter, I can do without the flames between gears.
BTW, 3'' downpipe and 2.5'' IC piping being done Tuesday. I can't wait to see if she spools faster.
#11649, "RE: Backfiring? Good or Bad?" In response to Reply # 9
his car doesn't need an o2 sensor. tuning it should help eliminate some of that if you have calmap.
bring it on............
A.D.P. "...If you do too much, people become dependant. If you do to little, people loose hope. If you do it right, people won't be sure you've done anything at all." bring it on...........
#11650, "RE: Backfiring? Good or Bad?" In response to Reply # 10
the only thing i use an 02 sensor for is to get an air/fuel reading to make sure i'm rich enough and that it doesnt run lean under boost, which shouldnt be a prob with the fuel setup it has, but you cant be too safe...
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