Backfire when shifting - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

canu_50 · 09-25-2012, 10:09 AM

Hello guys,

i am wondering if any of you have this issue:

Since i have installed my Injen Intake, sometimes when i am in lower gear (going from 1-2 or 2-3) i have this backfire sound when i get back on the gas.

I was wondering if anybody had this issue before.

I am starting to think it might be my catalityc converter that is going away.

I have no pingging nothing, always gas up at 94.

post_break · 09-25-2012, 10:22 AM

I've had this happen twice. I let the RPMs fall too low and when I blip the throttle to rev match it back fires or makes a popping sound. Make sure your RPMs aren't really low before you stomp on it.

canu_50 · 09-25-2012, 10:51 AM

no mine happen when i shift rapidly, it doesn't come down, and usually happens when i am 3/4 throttle in 2nd gear, then shift and going back on the gas at 3/4 throttle again.

canu_50 · 09-26-2012, 11:02 AM

Anybody?? people with injen intake?

TouchMyHonda · 09-26-2012, 11:09 AM

Dude it's normal. It's a happy noise.

Sargy · 09-26-2012, 11:12 AM

I would be excited about backfire instead of worry. Ever heard a high compression motor with only headers before?

gmookher · 09-26-2012, 11:24 AM

well that takes injen off my list...

canu_50 · 09-26-2012, 11:37 AM

I am all about backfire when it makes sense! I come from a 400whp nissan skyline...

Don't worry i have heard and race high compression motor with exhaust.

yomny · 09-26-2012, 11:43 AM

Taking a wild guess here, the intake is causing changes in the air fuel mixture and leaving unburnt mixtures behind, a tune is needed. Seems that these cars are very sensitive to any changes in ecu readings.

canu_50 · 09-26-2012, 12:10 PM

That was also on my list, but i tought the ecu could compensate since i am running 94 and not 91. I will put back the stock intake to see if it still does it, if it does it's propably the Cat.

jstn · 09-26-2012, 12:25 PM

Its probably just because of intake + no tune. I wouldn't even worry about it unless the sound annoys you. Personally mine pops and spits a little bit on downshifts since the muffler delete and I get a semi-boner every time.

DR1FT · 09-26-2012, 01:05 PM

you are running rich and you need a tune.

Quote:

Originally Posted by TouchMyHonda

Dude it's normal. It's a happy noise.

Go back to the Honda Forums.

canu_50 · 09-26-2012, 01:09 PM

Don't get me wrong, i really don't mind, even the first couple of time it happened i felt the pleasure of beating the shit out of a turbo car.I bought this car to beat it on the track and i sale performance part, backfires doesn't bother me at all, if it had been a cat problem, i would of gone test pipe.

Since it's a new car i'd rather ask and see if i am the only one!

Thanks guys!

Cheddar · 09-26-2012, 01:15 PM

Gas mileage might suffer.

09-25-2012, 10:09 AM	#1
canu_50 Senior Member Join Date: Aug 2012 Drives: Scion fr-s Location: Terrebonne Posts: 239 Thanks: 115 Thanked 59 Times in 47 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Backfire when shifting Hello guys, i am wondering if any of you have this issue: Since i have installed my Injen Intake, sometimes when i am in lower gear (going from 1-2 or 2-3) i have this backfire sound when i get back on the gas. I was wondering if anybody had this issue before. I am starting to think it might be my catalityc converter that is going away. I have no pingging nothing, always gas up at 94.

09-26-2012, 11:12 AM	#6
Sargy Long Distance Driver Join Date: Aug 2012 Drives: 2013 Scion FR-S Location: Northern VA Posts: 779 Thanks: 565 Thanked 312 Times in 207 Posts Mentioned: 43 Post(s) Tagged: 3 Thread(s)	I would be excited about backfire instead of worry. Ever heard a high compression motor with only headers before? __________________ My TRD transformation build: http://www.ft86club.com/forums/showthread.php?t=38648

09-26-2012, 11:43 AM	#9
yomny Senior Member Join Date: Jul 2012 Drives: 2013 FRS Whiteout Location: MIA Posts: 1,545 Thanks: 557 Thanked 469 Times in 340 Posts Mentioned: 33 Post(s) Tagged: 5 Thread(s)	Taking a wild guess here, the intake is causing changes in the air fuel mixture and leaving unburnt mixtures behind, a tune is needed. Seems that these cars are very sensitive to any changes in ecu readings. __________________ GTX2867R, moto-tuned , tomei op , motiv fp , Invidia Q300 ti , Rota titan 17x9 +42 , nt555 255/40 , ST coilovers w/cascam , Hotchkis sways

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09-25-2012, 10:51 AM	#3
canu_50 Senior Member Join Date: Aug 2012 Drives: Scion fr-s Location: Terrebonne Posts: 239 Thanks: 115 Thanked 59 Times in 47 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	no mine happen when i shift rapidly, it doesn't come down, and usually happens when i am 3/4 throttle in 2nd gear, then shift and going back on the gas at 3/4 throttle again.

09-26-2012, 11:02 AM	#4
canu_50 Senior Member Join Date: Aug 2012 Drives: Scion fr-s Location: Terrebonne Posts: 239 Thanks: 115 Thanked 59 Times in 47 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Anybody?? people with injen intake?

09-26-2012, 11:09 AM	#5
TouchMyHonda Vtec Jesus Join Date: Jul 2012 Drives: 13 BRZ, 13 Golf R, 15 Audi S4 Location: LSD Posts: 1,165 Thanks: 623 Thanked 243 Times in 153 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Dude it's normal. It's a happy noise.

09-26-2012, 11:24 AM	#7
gmookher Banned Join Date: Aug 2012 Drives: VortechSC,BorlaEL,Perrin,GCRace Location: HighHeatHighAltitudeAZ,USA Posts: 2,254 Thanks: 458 Thanked 669 Times in 394 Posts Mentioned: 9 Post(s) Tagged: 2 Thread(s)	well that takes injen off my list...

09-26-2012, 11:37 AM	#8
canu_50 Senior Member Join Date: Aug 2012 Drives: Scion fr-s Location: Terrebonne Posts: 239 Thanks: 115 Thanked 59 Times in 47 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I am all about backfire when it makes sense! I come from a 400whp nissan skyline... Don't worry i have heard and race high compression motor with exhaust.

09-26-2012, 12:10 PM	#10
canu_50 Senior Member Join Date: Aug 2012 Drives: Scion fr-s Location: Terrebonne Posts: 239 Thanks: 115 Thanked 59 Times in 47 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	That was also on my list, but i tought the ecu could compensate since i am running 94 and not 91. I will put back the stock intake to see if it still does it, if it does it's propably the Cat.

09-26-2012, 12:25 PM	#11
jstn Senior Member Join Date: Jul 2012 Drives: '15 Vortech Supercharged Location: United States Posts: 105 Thanks: 7 Thanked 34 Times in 19 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Its probably just because of intake + no tune. I wouldn't even worry about it unless the sound annoys you. Personally mine pops and spits a little bit on downshifts since the muffler delete and I get a semi-boner every time.

09-26-2012, 01:09 PM	#13
canu_50 Senior Member Join Date: Aug 2012 Drives: Scion fr-s Location: Terrebonne Posts: 239 Thanks: 115 Thanked 59 Times in 47 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Don't get me wrong, i really don't mind, even the first couple of time it happened i felt the pleasure of beating the shit out of a turbo car.I bought this car to beat it on the track and i sale performance part, backfires doesn't bother me at all, if it had been a cat problem, i would of gone test pipe. Since it's a new car i'd rather ask and see if i am the only one! Thanks guys!

09-26-2012, 01:15 PM	#14
Cheddar Saving them pennies... Join Date: Apr 2012 Drives: 2013 FR-S Location: Miami, FL Posts: 641 Thanks: 44 Thanked 178 Times in 111 Posts Mentioned: 17 Post(s) Tagged: 3 Thread(s)	Gas mileage might suffer.

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