NPP crackling and popping - Page 2

SomeGeoffGuy · 08-15-2022, 12:37 AM

Quote:

Originally Posted by SATINSTEEL1LE

A time limit...? Lol. Silly internet facts.

Its by RPM. I've seen the DFCO tables by RPM where its set.

That was what the lead development engineer at GM told me. What does he know?

-Geoff

Crushin_LT1 · 08-15-2022, 09:26 AM

Quote:

Originally Posted by armycop71

I love the crackles and pops. It seems to do it most in 2nd gear when I let off the gas. Perfect when I'm driving thru downtown areas.

2nd Gear definitely seems to be the most crackly gear for it.

KingLT1 · 08-15-2022, 09:33 AM

Your exhaust sounding like a fresh bowl of rice crispy's on decel is based on DFCO and timing.

DFCO enables and disables by RPM, ECT, Speed, Torque, and Catalyst temp.

SATINSTEEL1LE · 08-15-2022, 09:43 AM

Quote:

Originally Posted by SomeGeoffGuy

That was what the lead development engineer at GM told me. What does he know?

-Geoff

1. I dont believe you.
2. If you are telling the truth then I'd check that "lead dev engineer's" creds...LOL

SATINSTEEL1LE · 08-15-2022, 09:44 AM

Quote:

Originally Posted by KingLT1

Your exhaust sounding like a fresh bowl of rice crispy's on decel is based on DFCO and timing.

DFCO enables and disables by RPM, ECT, Speed, Torque, and Catalyst temp.

Thank you. Finally less hear-say and more facts. Man these forums can get dicey with "joe so and so from GM told me its magic"...LOL K

SomeGeoffGuy · 08-15-2022, 11:38 AM

Quote:

Originally Posted by SATINSTEEL1LE

1. I dont believe you.
2. If you are telling the truth then I'd check that "lead dev engineer's" creds...LOL

Mark Dickens told me that at Camarofest back in the teens. I am not interested in starting an internet flame war or anything. Believe me or don't. No offense, but you are being kind of a dick.

-Geoff

SomeGeoffGuy · 08-15-2022, 02:22 PM

Now that I think about it, it was 2013 Camarofest so we were probably talking about 5th gens - I had a 2012 M6 at the time. So, sorry to mislead. Not trying to spread rumors here, but that is what he told me.

If I see any of those guys this weekend, I am going to ask. You probably think that sounds crazy and are going to call bs, but it is the Woodward Dream Cruise, so you never know!

-Geoff

retmil · 08-15-2022, 03:07 PM

Chutzpah - I installed Stainless Works 3" stainless cat back with their mufflers with the NPP valves. The tone is definitely deeper with less crackle/pops. If I remember correctly the price was right around $2k.

Chutzpah · 08-15-2022, 06:57 PM

Quote:

Originally Posted by retmil

Chutzpah - I installed Stainless Works 3" stainless cat back with their mufflers with the NPP valves. The tone is definitely deeper with less crackle/pops. If I remember correctly the price was right around $2k.

Thanks!

SATINSTEEL1LE · 08-15-2022, 07:05 PM

Quote:

Originally Posted by SomeGeoffGuy

Mark Dickens told me that at Camarofest back in the teens. I am not interested in starting an internet flame war or anything. Believe me or don't. No offense, but you are being kind of a dick.

-Geoff

Fair enough, I was being a dick. But frankly seeing your internet facts that I completely know to be false, kind of pisses me off. People read this and will read this for years thinking that what you said was true since you "heard it from a GM engineer"... Well its not. Not only have I seen, but I have manipulated those tables that change the DFCO effecting the pops and bangs. When you meet the different criteria and are in the RPM window where its setup, you will hear it as you decel.

There is no timing here. So my apologies if I was a dick, but man check your facts.

paradigm · 09-14-2022, 02:07 PM

I really dislike the crackling / popping on deacceleration in my 22 1LE 6 speed.

I wish I could tune it out without voiding the warranty.

This whole crack/pop tuning reminds me of the early ricer days with hondas and their obnoxious exhausts - they do nothing for performance, and everything for attention which I hate.

Chrome383Z · 09-15-2022, 04:26 AM

Quote:

Originally Posted by paradigm

I really dislike the crackling / popping on deacceleration in my 22 1LE 6 speed.

I wish I could tune it out without voiding the warranty.

This whole crack/pop tuning reminds me of the early ricer days with hondas and their obnoxious exhausts - they do nothing for performance, and everything for attention which I hate.

I’m with you. I have it tuned out and now I just have the sweet “normal” sound as the engine decels off throttle.

WhiteMale · 09-15-2022, 05:59 AM

I see a lot of this with the A10 vs the M6, unless you drop to manual mode and run it that way.

HemiDave · 09-26-2022, 12:38 AM

I rather enjoy it...Brings a smile to my face.

Thank you GM!!

08-15-2022, 09:33 AM	#17
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,827	Your exhaust sounding like a fresh bowl of rice crispy's on decel is based on DFCO and timing. DFCO enables and disables by RPM, ECT, Speed, Torque, and Catalyst temp. Attached Images __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

08-15-2022, 02:22 PM	#21
SomeGeoffGuy Drives: 2023 2SS Convertible Join Date: May 2009 Location: Metro Detroit Posts: 1,076	Now that I think about it, it was 2013 Camarofest so we were probably talking about 5th gens - I had a 2012 M6 at the time. So, sorry to mislead. Not trying to spread rumors here, but that is what he told me. If I see any of those guys this weekend, I am going to ask. You probably think that sounds crazy and are going to call bs, but it is the Woodward Dream Cruise, so you never know! -Geoff __________________ '12 2SS RS Convertible - Traded in. '16 2SS Convertible - White on white, mag-ride, NPP, nav. Sold! '23 2SS Convertible -Same as above except orange.

09-14-2022, 02:07 PM	#25
paradigm Drives: 2022 Camaro 1SS 1LE Join Date: Nov 2021 Location: Long Island, NY Posts: 381	I really dislike the crackling / popping on deacceleration in my 22 1LE 6 speed. I wish I could tune it out without voiding the warranty. This whole crack/pop tuning reminds me of the early ricer days with hondas and their obnoxious exhausts - they do nothing for performance, and everything for attention which I hate. __________________ 2022 Camaro 1SS 1LE 6-speed

09-26-2022, 12:38 AM	#28
HemiDave Drives: ZLE/DEMON/GLADIATOR/GSXR1000R/ZX10R Join Date: Aug 2022 Location: New York Posts: 439	I rather enjoy it...Brings a smile to my face. Thank you GM!! __________________ 2018 Dodge Demon #1399 2020 Jeep Gladiator Rubicon 6 speed manual 2023 ZL1 1LE 6 speed manual ************************* 2018 Suzuki GSXR 1000R 2021 Kawasaki ZX10R

08-15-2022, 03:07 PM	#22
retmil Drives: 2022 Wild Cherry SS Join Date: Aug 2012 Location: Germantown, Md Posts: 316	Chutzpah - I installed Stainless Works 3" stainless cat back with their mufflers with the NPP valves. The tone is definitely deeper with less crackle/pops. If I remember correctly the price was right around $2k.

09-15-2022, 05:59 AM	#27
WhiteMale Drives: 23 ZL1 A10 Rapid Blue Join Date: Aug 2020 Location: MO Posts: 2,013	I see a lot of this with the A10 vs the M6, unless you drop to manual mode and run it that way.

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