back fire? after fire?
03-12-2010, 12:39 PM
#1
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back fire? after fire?
well i shift and "pop" drive, shift and "pop" sometimes gas and deccelerate and "pop"..ok is this bad? im starting to wonder if its messing up my engine or turbo. how can i prevent it? or what can i do to make it go away if its bad or leave it how it is if its ok to drive like that.
03-12-2010, 12:54 PM
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Do you have a BOV?
Backfire=combustion in the intake tract
Afterfire=combustion out of tailpipe, which is what you're probably experiencing. This happens from unburned fuel in the extremely hot exhaust stream mixing with oxygen out the back of the exhaust system, resulting in combustion. It is not directly harmful to your engine, but does signify that you are running rich. The reason I ask if you have a BOV is because those make the engine run extremely rich when they release into the atmosphere. They are also pointless on 99% of Subaru applications.
Backfire=combustion in the intake tract
Afterfire=combustion out of tailpipe, which is what you're probably experiencing. This happens from unburned fuel in the extremely hot exhaust stream mixing with oxygen out the back of the exhaust system, resulting in combustion. It is not directly harmful to your engine, but does signify that you are running rich. The reason I ask if you have a BOV is because those make the engine run extremely rich when they release into the atmosphere. They are also pointless on 99% of Subaru applications.
03-12-2010, 01:09 PM
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backfire also happens with Catless downpipes/exhausts...
if you have no cats, don't be surprised when it backfires, especially at full throttle to no throttle transitions.
also a black rear bumper...
if you have no cats, don't be surprised when it backfires, especially at full throttle to no throttle transitions.
also a black rear bumper...
03-12-2010, 01:47 PM
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The only thing I can add to what has been posted above...is your ECU properly tuned for your mods? Combo of aftermarket BOV, intake, exhaust, etc and no tune will cause plenty of unwanted/random snap, crackle and pop. If you are tuned and still getting frequent back/after fires than there might be a more serious issue at hand...my $0.02
03-12-2010, 02:34 PM
#5
I ♥ backfire
If it get all the way out of the exhaust like the pic above it is truly beautiful
As I know, as long as it is happening after everything is supposed to ignite, it's not a big issue. If it is happening a lot, you could be running rich and just wasting fuel. If it happening in the intake, you could be having some valve failure. But I doubt that is what is going on.
And once more for good measure.
Man, I love fireballs.
If it get all the way out of the exhaust like the pic above it is truly beautiful
As I know, as long as it is happening after everything is supposed to ignite, it's not a big issue. If it is happening a lot, you could be running rich and just wasting fuel. If it happening in the intake, you could be having some valve failure. But I doubt that is what is going on.
And once more for good measure.
Man, I love fireballs.
03-12-2010, 02:50 PM
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^ nice pic...but that's probably at WOT blasting around the track.
One thing that OP also needs to clarify is whether it is happening under WOT driving or just leisurely normal speed cruising around town.
One thing that OP also needs to clarify is whether it is happening under WOT driving or just leisurely normal speed cruising around town.
03-12-2010, 03:37 PM
#7
I ♥ backfire
If it get all the way out of the exhaust like the pic above it is truly beautiful
As I know, as long as it is happening after everything is supposed to ignite, it's not a big issue. If it is happening a lot, you could be running rich and just wasting fuel. If it happening in the intake, you could be having some valve failure. But I doubt that is what is going on.
And once more for good measure.
Man, I love fireballs.
If it get all the way out of the exhaust like the pic above it is truly beautiful
As I know, as long as it is happening after everything is supposed to ignite, it's not a big issue. If it is happening a lot, you could be running rich and just wasting fuel. If it happening in the intake, you could be having some valve failure. But I doubt that is what is going on.
And once more for good measure.
Man, I love fireballs.
03-13-2010, 12:35 PM
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http://forums.nasioc.com/forums/show...06&postcount=1
Last edited by VRT MBasile; 03-13-2010 at 12:46 PM.
03-13-2010, 01:08 PM
#9
It's only ricer if you rig up a flame thrower. Otherwise, true fireballs are friggen AWESOME!
03-14-2010, 01:09 AM
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mine was tuned by ed , and it pops when i shift or decelerate, but only in first and second gear, where ed tuned the fuel to run rich, especailly on hot days it sounds fricking awesome!!!!!!!!!!!! no worries man, its jus running rich, jus remember, for subies its better to be rich, then lean and poor,lol
03-14-2010, 10:59 PM
#11
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niiiccee!!! alright thanks a lot guys.. i would love a fireball too.. i have no tune to my mods.. hoping to get tune soon but yes i have a greddy RS bov.. and so since its just running rich without harm to motor then great.. its coming from my muffler so i guess its afterfire? and JOURDON how did u get it to fireball like that? looks sexy =)
03-14-2010, 11:23 PM
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niiiccee!!! alright thanks a lot guys.. i would love a fireball too.. i have no tune to my mods.. hoping to get tune soon but yes i have a greddy RS bov.. and so since its just running rich without harm to motor then great.. its coming from my muffler so i guess its afterfire? and JOURDON how did u get it to fireball like that? looks sexy =)
03-15-2010, 12:16 AM
#14
niiiccee!!! alright thanks a lot guys.. i would love a fireball too.. i have no tune to my mods.. hoping to get tune soon but yes i have a greddy RS bov.. and so since its just running rich without harm to motor then great.. its coming from my muffler so i guess its afterfire? and JOURDAN how did u get it to fireball like that? looks sexy =)
But I know the ingredients are rich tune and catless exhaust. Not overly rich but yeah. I wouldn't run a fireball tune all the time. But if I had a AP I would have a rich tune loaded on there that I could switch to.