Tuning out Deceleration Exhaust Popping - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

ffrcobra_65 · 01-11-2010, 02:26 PM

LS3 normally make an exhaust popping and gurling sound during deceleration and the sound becomes even more noticeable and louder with an exhaust mod. I happen to like the noise but others find it annoying. The popping is caused by the DFCO (deceleration fuel cut off) and is a stock feature of the LS3 (maybe L99 as well?). Other than for sound suppresion, what are the benefits of tuning out the popping?

Edrock · 01-11-2010, 02:33 PM

This is just a guess...but wouldn't tuning out the decel pop mean fuel would continue to flow during decel, therefore, no more popping? If this is the case, then the downside to tuning it out would be a tad bit worse gas mileage, correct?

That's about the only negative I can think of.

Michael_Js · 01-11-2010, 02:37 PM

Hmmm...is that true? More fuel? I'm going to my dealer on Wed to have this tuned "down"...

ffrcobra_65 · 01-11-2010, 02:43 PM

Quote:

Originally Posted by Edrock

This is just a guess...but wouldn't tuning out the decel pop mean fuel would continue to flow during decel, therefore, no more popping? If this is the case, then the downside to tuning it out would be a tad bit worse gas mileage, correct?

That's about the only negative I can think of.

Yes, that is actually an accurate guess. Defeat or alter DFCO and fuel will keep flowing which is not bad, just resulting in slight reduction in MPG, much like when AFM is tuned out in L99 cars.

1320junkie · 01-11-2010, 02:45 PM

Because some folks like their muscle cars all nice and friendly....lmao

Camar0wn3d · 01-11-2010, 02:48 PM

Quote:

Originally Posted by ffrcobra_65

LS3 normally make an exhaust popping and gurling sound during deceleration and the sound becomes even more noticeable and louder with an exhaust mod. I happen to like the noise but others find it annoying. The popping is caused by the DFCO (deceleration fuel cut off) and is a stock feature of the LS3 (maybe L99 as well?). Other than for sound suppresion, what are the benefits of tuning out the popping?

Noise is pretty much the only reason. It's usually also tuned out when logging during the tuning process just to get better feedback from the engine, but usually DFCO is turned back on after tuning is done.

Quote:

Originally Posted by Edrock

This is just a guess...but wouldn't tuning out the decel pop mean fuel would continue to flow during decel, therefore, no more popping? If this is the case, then the downside to tuning it out would be a tad bit worse gas mileage, correct?

That's about the only negative I can think of.

you are correct, slightly worse gas mileage. I lost about 1.5 or 2mpg when I tuned it out. however, there is a way to adjust the DFCO parameters so that it cuts the fuel on decel without popping (agressive parameters), but determining those values can be time consuming.

ffrcobra_65 · 01-11-2010, 02:49 PM

Quote:

Originally Posted by 1320junkie

Because some folks like their muscle cars all nice and friendly....lmao

and of course you are not one of them folks, are ya?

1320junkie · 01-11-2010, 02:52 PM

Quote:

Originally Posted by ffrcobra_65

and of course you are not one of them folks, are ya?

I do not like refined muscle cars...heck I wish you could order a 5th gen without power steering, a/c and all of that other crap.

BLACK10 · 01-11-2010, 09:19 PM

Quote:

Originally Posted by 1320junkie

I do not like refined muscle cars...heck I wish you could order a 5th gen without power steering, a/c and all of that other crap.

x2 brotha

Danny Thomas · 01-12-2010, 06:58 PM

Quote:

Originally Posted by 1320junkie

I do not like refined muscle cars...heck I wish you could order a 5th gen without power steering, a/c and all of that other crap.

x3 These are muscle cars not pimp mobiles..whats with the 22's and bling bling

brandotron · 01-12-2010, 07:03 PM

Quote:

Originally Posted by 1320junkie

I do not like refined muscle cars...heck I wish you could order a 5th gen without power steering, a/c and all of that other crap.

You can!

BEARS-SS · 02-25-2010, 02:19 PM

Thanks for this post, by the way. I was wondering what was wrong with my exhaust, but I guess it's the DFCO, something not found in the crappy cars I've had in the past.

BUMBLEB · 02-25-2010, 10:30 PM

American muscle this is not your moms car this is new gen old school

litle88 · 02-26-2010, 06:50 AM

I can't stand when grown men want to tune out or get rid of things that are a must on a CAMARO SS/RS. Remember SS stands for Stock Sucks. Lol

01-11-2010, 02:26 PM	#1
ffrcobra_65 Account Suspended Drives: SuperCharged 2SS/RS IOM MN6 Join Date: May 2009 Location: CA Posts: 5,094	Tuning out Deceleration Exhaust Popping LS3 normally make an exhaust popping and gurling sound during deceleration and the sound becomes even more noticeable and louder with an exhaust mod. I happen to like the noise but others find it annoying. The popping is caused by the DFCO (deceleration fuel cut off) and is a stock feature of the LS3 (maybe L99 as well?). Other than for sound suppresion, what are the benefits of tuning out the popping?

01-11-2010, 02:33 PM	#2
Edrock Drives: '10 Camaro 2SS LS3 Join Date: Jan 2009 Location: Jamestown, NC Posts: 964 View My Garage	This is just a guess...but wouldn't tuning out the decel pop mean fuel would continue to flow during decel, therefore, no more popping? If this is the case, then the downside to tuning it out would be a tad bit worse gas mileage, correct? That's about the only negative I can think of. __________________ DT Shorties, Solo hi-flow Cats, X-pipe, resonator delete, Flowmaster Super-44s, VMAX TB, Stronger MAF, C.A.I. Intake with race scoop, and JRE Tune! WOT is my happy place!!

01-11-2010, 02:37 PM	#3
Michael_Js SoCal C5 Family Member Drives: 2010 Camaro SS/RS - Black w/IOM; 6M Join Date: Jul 2009 Location: San Diego, CA, USA Posts: 5,299 View My Garage	Hmmm...is that true? More fuel? I'm going to my dealer on Wed to have this tuned "down"... __________________ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~ 2010 Black 2SS/RS; 6M; IOM, GFX, sunroof; ADM Race CAI; Zoomers CB; Viper Alarm; Pdaft F&R sways, Adj Endlinks, Rtrailing arms, Camber kit, strut brace, Front Trailing Arm Bushing; SLP Skip-Shift Elim; Tinted lights/windows; Hurst Short-throw; LoJack; Door & Dash ABL Mods; ********; JBA Shorty headers; AACStyle LEDs; Stillen DS rotors, Hawk Ceramic pads; Havoc Blk Chrome wheels: 20x9s; Lingenfelter Blk Al Pedals; RevXtreme Catch Can; Goodridge SS lines; Ported TB; RK Sport hood; Hotchkis chassis brace; KW V3 coilovers;

02-25-2010, 02:19 PM	#12
BEARS-SS Drives: 2010 Camaro 2SS/RS Join Date: Feb 2010 Location: Yorktown, Virginia Posts: 454 View My Garage	Thanks for this post, by the way. I was wondering what was wrong with my exhaust, but I guess it's the DFCO, something not found in the crappy cars I've had in the past. __________________

02-25-2010, 10:30 PM	#13
BUMBLEB IN GOD WE THRUST Drives: 2010 RY 2SS RS M6 TVS2300 2015 Z06 Join Date: Sep 2009 Location: PARKER,CO Posts: 284	American muscle this is not your moms car this is new gen old school __________________ SUCKING AIR & GAS & HAULING ASS http://www.picturetrail.com/sfx/album/view/22851126

01-11-2010, 02:45 PM	#5
1320junkie Drives: The Imperial Army Join Date: Feb 2009 Location: The Darkside Posts: 15,742	Because some folks like their muscle cars all nice and friendly....lmao

02-26-2010, 06:50 AM	#14
litle88 V8 Lounge member #2 Drives: 2001 Ws6 Join Date: Sep 2009 Location: Burbank,IL Posts: 6,373	I can't stand when grown men want to tune out or get rid of things that are a must on a CAMARO SS/RS. Remember SS stands for Stock Sucks. Lol __________________ 2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.

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