Backfiring? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

dwake · 07-07-2010, 10:49 PM

Got my Magnacharger and axle back exhaust installed and a custom tune and am getting some consistent backfires on decelleration, is this common? Its kind of annoying....

Revo1 · 07-07-2010, 11:01 PM

Normal dude. We're not talking full-sized, gunfire-esque backfires right? Just popping a bit?

dwake · 07-08-2010, 12:23 AM

Yeah, more like a crackling/poping... nothing too loud/gunfire-esque

Z_Rocks · 07-08-2010, 12:27 AM

Quote:

Originally Posted by dwake

Yeah, more like a crackling/poping... nothing too loud/gunfire-esque

Did they tune the car to run rich?

dwake · 07-08-2010, 12:38 AM

Not sure if they did intentionally, but the back firing makes me think it is running a bit rich. Again its not that loud like a gun shot, but more of a crackling/poping sound. Just trying to figure out if this is normal for a supercharger, axle back and custom tune. ~520 rwhp on the dyno BTW...

ddavis · 07-08-2010, 12:41 AM

i have some backflow popping after installing my catback that happens on deceleration. I bet its the result from the axleback and not the supercharger. Its there but just a much lower note with the stock exhaust, the new exhaust is just making it louder now.

Z_Rocks · 07-08-2010, 12:48 AM

Quote:

Originally Posted by ddavis

i have some backflow popping after installing my catback that happens on deceleration. I bet its the result from the axleback and not the supercharger. Its there but just a much lower note with the stock exhaust, the new exhaust is just making it louder now.

This is true with exhaust systems that do not muffle the sound as much as the stock. Also, if the tune is rich for S/C, the unburnt gas will create that as well. So, it could be combination of both. However, if it is loud pops, then take it back to the shop to check the fuel system.

aet08 · 07-08-2010, 12:38 PM

I love the sound of the backfiring, makes the car sound mean!

Russell James · 07-08-2010, 12:47 PM

There are a couple ways to tune it out. Ask the tuner if they left the decel fuel cutoff still turned on the OE settings. That can be tinkered with as well as decel timing.

The OE setting create such a lean condition on decel there is not enough fuel to support combustion in the chamber. So any little fuel that is there goes out into the exhaust as raw fuel, when it hits oxygen - pop.

I don't have a supercharger, just headers and CAI. Mine pops like that on the OE tuning. On a custom tune where I had the decel fuel cutoff turned off, not a single decel pop. You do lose a little mpgs doing that though, not much maybe a couple.

Stingr69 · 07-08-2010, 01:13 PM

Quote:

Originally Posted by Russell James

There are a couple ways to tune it out. Ask the tuner if they left the decel fuel cutoff still turned on the OE settings. That can be tinkered with as well as decel timing.

The OE setting create such a lean condition on decel there is not enough fuel to support combustion in the chamber. So any little fuel that is there goes out into the exhaust as raw fuel, when it hits oxygen - pop.

I don't have a supercharger, just headers and CAI. Mine pops like that on the OE tuning. On a custom tune where I had the decel fuel cutoff turned off, not a single decel pop. You do lose a little mpgs doing that though, not much maybe a couple.

This +1

Lean condition (afterfiring).

-Mark.

dwake · 07-08-2010, 01:36 PM

Great info everyone, thanks! I'll see how it goes and if it is too annoying I'll turn the stereo up, and if that doesn't work I'll check into decel fuel cut off setting in the tune.

Thanks again!

Ivas · 07-08-2010, 08:04 PM

Don't sweat the backfiring; it's all part of the way performance cars run.

Granatelli · 07-08-2010, 10:24 PM

That is not "backfiring" it is raw fuel burning in the exhaust and ingnition after the compression stroke. That can be tuned out so it won't do that

dwake · 07-08-2010, 11:12 PM

A Back-fire or backfire is an explosion produced by a running internal combustion engine that occurs in the intake or exhaust system rather than inside the combustion chamber.

Sounds like a backfire to me... regardless, everyone knew what I was talking about so the term seems to fit the issue....

07-07-2010, 10:49 PM	#1
dwake Drives: 2010 Inferno Orange 2SS Camaro Join Date: Jan 2010 Location: Southern California Posts: 36	Backfiring? Got my Magnacharger and axle back exhaust installed and a custom tune and am getting some consistent backfires on decelleration, is this common? Its kind of annoying....

07-07-2010, 11:01 PM	#2
Revo1 Don't Like it? Suggit. Drives: 2010 2SS/RS Join Date: Aug 2008 Location: Fresno, CA Posts: 14,832 View My Garage	Normal dude. We're not talking full-sized, gunfire-esque backfires right? Just popping a bit? __________________ "Tops off, tach up baby- loud and proud!" A Camaro lover from day one- 1996 3.8 V6 Camaro, to 1996 5.7 LT1 Camaro Z28, to the sold 2002 5.7 LS1 Camaro SS, and NOW, a [I]6.2 L99 VR 2SS/RS: XS Power stainless full exhaust, Airaid CAI, BMR drop springs and sways, custom tune by Cal Speed- 411rwhp

07-08-2010, 12:41 AM	#6
ddavis boostalicious Drives: Blown Ls3 Join Date: May 2010 Location: Bay Area SF Posts: 1,030 View My Garage	i have some backflow popping after installing my catback that happens on deceleration. I bet its the result from the axleback and not the supercharger. Its there but just a much lower note with the stock exhaust, the new exhaust is just making it louder now. __________________ Powered by Maggie553rwhp 541rwtq

07-08-2010, 08:04 PM	#12
Ivas el Ruco Drives: 2010 Camaro SS (now runnin' TENS ) Join Date: Nov 2009 Location: Fontana, CA Posts: 7,388	It's all good. Don't sweat the backfiring; it's all part of the way performance cars run.

07-08-2010, 12:23 AM	#3
dwake Drives: 2010 Inferno Orange 2SS Camaro Join Date: Jan 2010 Location: Southern California Posts: 36	Yeah, more like a crackling/poping... nothing too loud/gunfire-esque

07-08-2010, 12:38 AM	#5
dwake Drives: 2010 Inferno Orange 2SS Camaro Join Date: Jan 2010 Location: Southern California Posts: 36	Not sure if they did intentionally, but the back firing makes me think it is running a bit rich. Again its not that loud like a gun shot, but more of a crackling/poping sound. Just trying to figure out if this is normal for a supercharger, axle back and custom tune. ~520 rwhp on the dyno BTW...

07-08-2010, 12:38 PM	#8
aet08 Drives: c Join Date: Feb 2010 Location: c Posts: 627	I love the sound of the backfiring, makes the car sound mean!

07-08-2010, 12:47 PM	#9
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,482	There are a couple ways to tune it out. Ask the tuner if they left the decel fuel cutoff still turned on the OE settings. That can be tinkered with as well as decel timing. The OE setting create such a lean condition on decel there is not enough fuel to support combustion in the chamber. So any little fuel that is there goes out into the exhaust as raw fuel, when it hits oxygen - pop. I don't have a supercharger, just headers and CAI. Mine pops like that on the OE tuning. On a custom tune where I had the decel fuel cutoff turned off, not a single decel pop. You do lose a little mpgs doing that though, not much maybe a couple.

07-08-2010, 01:36 PM	#11
dwake Drives: 2010 Inferno Orange 2SS Camaro Join Date: Jan 2010 Location: Southern California Posts: 36	Great info everyone, thanks! I'll see how it goes and if it is too annoying I'll turn the stereo up, and if that doesn't work I'll check into decel fuel cut off setting in the tune. Thanks again!

07-08-2010, 10:24 PM	#13
Granatelli Account Suspended Drives: 2SS Victory Red Join Date: Jul 2009 Location: Oxnard Posts: 1,093	That is not "backfiring" it is raw fuel burning in the exhaust and ingnition after the compression stroke. That can be tuned out so it won't do that

07-08-2010, 11:12 PM	#14
dwake Drives: 2010 Inferno Orange 2SS Camaro Join Date: Jan 2010 Location: Southern California Posts: 36	A Back-fire or backfire is an explosion produced by a running internal combustion engine that occurs in the intake or exhaust system rather than inside the combustion chamber. Sounds like a backfire to me... regardless, everyone knew what I was talking about so the term seems to fit the issue....