01-16-2020, 09:43 PM | #1 |
Drives: 77 z28 Join Date: Mar 2017
Location: Callahan FL
Posts: 84
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popping exhaust on engine braking
Hi gang, hope the new year is going well.
Thx for all the help as I find my way in the 5th gen world, last 4 cars have been 2 Z28 and 2 SS 4th gens. 2010 M6 stock except for CAI and a Billy Boat cat back. Car is amazing compared to the 4th gens, hoping for LT's and a tune in spring. I was shocked at the price of the B&B exhaust when I looked it up, WOW! I would have put on a chambered system, loved them on 2000 & 2002 SS. Question, sounds great at idle and under power but under engine braking (deceleration) I'm getting burbling slight popping noise? Is this just the exhaust system or a tuning issue? The car has 55 on the clock. While I'm at it anyone running a chambered exhaust? |
01-16-2020, 10:11 PM | #2 |
It don’t come easy.
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The popping can be tuned out but, par for the course on a stock setup, imo.
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01-17-2020, 05:13 AM | #3 |
SomeguyK
Drives: 2010 Black 2SS/RS Join Date: Nov 2014
Location: FL
Posts: 1,947
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It is called DFCO. Deceleration Fuel Cutoff. Makes the exhaust crackle and pop on deceleration. It can be turned via tune. I think it sounds awesome.
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TMS 427, Dart iron Block, Forged assembly, Frankenstien heads, AGP TT 62/62 BB turbo's, AGP/Fore triple fuel system, Tilton clutch, Holley 1 7/8 shorties, Technostalgia tail lights,Oracle, Aeroforce, MGW shifter,Flowmaster, Pegasus subframe bushings,BMR trailing & toe arms,Z28 UCA bushings,Zl1 rear sway bar,Prothane,BMR,Goodridge brake lines,Ridetech HQ coilovers,3.91,Trutrac,billet caps,DSS axles,HE offest,built TR6060,1LE diffuser,Havoc spoiler,SSclones,20in MRR 017, Pirelli P Zero, Nitto NT555RII
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01-17-2020, 06:51 AM | #4 |
Drives: 2011 Camaro 2SS LS3 Whipple Join Date: May 2019
Location: Connecticut
Posts: 1,925
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Yea the injectors are turned off after about 1-2 seconds of no throttle input. Makes the exhaust pop. It's really loud on my car, I kinda like it but it does get annoying on a longer drive. If I get irritated with it I just push the clutch in when decelerating. It also makes my A/F gauge blink red on lean, also irritating.
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Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane
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01-18-2020, 04:09 PM | #5 |
Drives: Camaro Join Date: Jan 2019
Location: home
Posts: 12
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What makes popping? Late ignition and fuel. deceleration fuel cut off, timing and transition must be configured ....
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01-18-2020, 05:10 PM | #6 | |
Drives: 2014 2SS/RS Join Date: Jan 2018
Location: Washington
Posts: 848
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Quote:
You can see exaggerated examples with cars that they instal 2 step controllers into and set them up to blow flames when letting off the throttle
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2014 2SS/RS LS3/M6
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01-18-2020, 06:40 PM | #7 |
Drives: 2011 Camaro 2SS LS3 Whipple Join Date: May 2019
Location: Connecticut
Posts: 1,925
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I don't know for sure but i don't think that's how it works on these. If that were the case my A/F would read rich for a few seconds at least, it doesn't, after a second my a/f goes all the way lean telling me the injector is cut off, no fuel then the popping starts. Once the fuel cuts off there isn't enough fuel for a combustion event in the cylinder, then any small amounts of fuel are pushed into the hot exhaust, hits oxygen and snap crackle pop.
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Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane
Last edited by Greenhornet2; 01-18-2020 at 06:57 PM. |
01-21-2020, 08:20 AM | #8 |
Drives: 77 z28 Join Date: Mar 2017
Location: Callahan FL
Posts: 84
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Thx for all the info, living with the popping for now, it sounds kind of cool in a way.
As long is it does not get worse when the LT's go on, of course I will have to do a tune after the install, time will tell. Thx again everyone! |
01-21-2020, 09:00 AM | #9 |
Drives: 2011 Camaro 2SS LS3 Whipple Join Date: May 2019
Location: Connecticut
Posts: 1,925
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As the exhaust gets louder the pops get louder.
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Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane
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01-21-2020, 09:56 AM | #10 |
Instagram: Sangstah
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Totally normal and you just don't notice it with stock exhaust. Some people tune to get even more decel pops.
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2019 SS 1LE - "CaSSandra" 2014 SS - "AleSSandra - Sold" 94 Z28 - Sold Follow the build https://www.camaro6.com/forums/showthread.php?t=612717 |
01-24-2020, 06:35 PM | #11 | |
Drives: 2014 Chevy SS Join Date: Nov 2014
Location: San Antonio, TX
Posts: 277
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Quote:
I'm gonna have a little chat with my tuner next week.... KW
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1995 Impala SS -- Heads/Cam LS3
1996 Impala SS -- 398ci LL Solid Roller LT4 2014 Chevy SS --- 429ci Hydraulic Roller LS3 |
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01-24-2020, 06:51 PM | #12 |
Drives: 2010 CGM 2SS/RS LS3 Swapped A6 Join Date: Sep 2016
Location: Spring Hill, FL
Posts: 4,620
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I asked DynoSteve to adjust it in my tune (DFCO) because I love the pops and burbles, but he said No Bueno. He told me it beats up the valves.
But I already have some naturally and I am fine with that...I guess. It's one of those things that some people love and some people hate.
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2010 CGM Camaro 2SS LS3 Swapped A6 - GPI LS3 SS1 .647/.638, (224/237, 112 +4, 7º overlap) on CamMotion 8620 core, BTR Platinum .660" Dual Spring kit w/titanium retainers, CHE bronze trunnion upgrade, stock heads milled @ .015, Melling HV 10296 oil pump, TSP 1-7/8" long tube headers (W/Catless Off-road Pipes), Corsa Xtreme 3" Catback, GPI Ported/Rod Mod Intake, Stage 2 Ported Throttle Body, Vararam OTR CAI, Mike Norris Gen 2 catch can + GM 1LE clean side separator, 160º thermostat - Megan Racing adjustable coilovers (lowered 1.75"), MRR M017 10/11" wheels-Tuned by Ryan @ GPI
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01-24-2020, 07:35 PM | #13 | |
Drives: 12 2SS/RS L99,11 2SS/RS LS3totaled Join Date: Jun 2019
Location: mooresville nc
Posts: 1,048
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Quote:
with the magnaflow cat back the snap crackle pop is like ear candy i love it. my tune didn't add to it or reduce it. Last edited by lemontwist; 01-24-2020 at 11:54 PM. |
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01-24-2020, 07:41 PM | #14 |
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Drives: 2013 Sparkly Red One Join Date: Dec 2018
Location: Hospitality State
Posts: 2,558
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It's fun in a busy tunnel.
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