NPP crackling and popping

David Zak · 08-13-2022, 11:54 AM

I just love that sound but was wondering is that someone Chevy engineers caused to happen?

My friend says he hates it and that it sounds artificial. He prefers the exhaust noises from his 1969 Hemi Roadrunner.

arpad_m · 08-13-2022, 12:59 PM

Gm changed the tune in 2019 to produce way more pops and crackles. They were fairly decent in 2016-2018 cars, meaning just 2-3 pops if you wanted to induce them, as opposed to several seconds of popping and crackling in 2019+ model years.

There is a thread here with the relevant table (minimum final spark) and the changes displayed in HP Tuners, in case you want to tune this back to the previous state. Needless to say, such changes will void the powertrain warranty, and no, Chevy service departments won't be willing to do this.

Chrome383Z · 08-13-2022, 01:12 PM

Mine are tuned out. I hated them. Sounded stupid… IMO.

LT1ornothing · 08-13-2022, 01:22 PM

Quote:

Originally Posted by Chrome383Z

Mine are tuned out. I hated them. Sounded stupid… IMO.

Love it, especially inducing them driving through the highway underpass or tunnel with the windows down. Muffler delete only makes it that much better.

BLACK21SS · 08-13-2022, 02:49 PM

I like it. I had an SRT-4 modded to 375 HP with a 3” side dump exhaust. It was fun driving up to someone blocking the left lane on the Interstate. I’d floor it, left off as I approached them, and side by side it would sound like a 12 gauge went off. It would certainly snap them out of their stupor.

Wintermute · 08-14-2022, 04:01 AM

It's a side effect of direct injection, but Chevy tuned the car to accentuate it.

Booher · 08-14-2022, 08:08 AM

My 2013 frs never once popped or crackled bwfore or after tune and that's direct injection. So idk, if all di engines do that, could be wrong, just my experience

SomeGeoffGuy · 08-14-2022, 08:35 AM

It's tuned in - they add gas on de-cel. There is a time limit on it too, so if it stops, you can tap the gas and get it going again.

-Geoff

Chutzpah · 08-14-2022, 09:43 AM

For the most part I dislike these…it’s just over the top. Deep burbles = good… Loud gunshots = stupid. It sounds like the cat converters are going to disintegrate….

The biggest problem for me is if I want to pass someone or pull out quick without drama, it just can’t be done (sounds like you’re trying to make a statement). Why GM thought everyone would love this or not give the option of linking the increased pops and crackles to a driving mode / some other software, just makes no sense to me.

I’d pay GM a couple hundred bucks to change it back to the way it was 2016-2018.

retmil · 08-14-2022, 11:26 AM

Chutzpah - I agree with you. The loud popping and crackling sounds too much like a tuner exhaust on a four cylinder engine. I disliked it so much that I did a cat back exhaust swap which eliminated about ninety percent of the racket. I also find that if I change the engine sound to Stealth the tone is a little deeper with less crackle.

Chutzpah · 08-14-2022, 03:33 PM

Quote:

Originally Posted by retmil

Chutzpah - I agree with you. The loud popping and crackling sounds too much like a tuner exhaust on a four cylinder engine. I disliked it so much that I did a cat back exhaust swap which eliminated about ninety percent of the racket. I also find that if I change the engine sound to Stealth the tone is a little deeper with less crackle.

Interesting, what did you install as far as the cat back? Do you mind me asking the cost? And does your new system keep a deep tone? Thanks for any info provided!

ZPirate · 08-14-2022, 03:46 PM

Quote:

Originally Posted by 1LEornothing

Love it, especially inducing them driving through the highway underpass or tunnel with the windows down. Muffler delete only makes it that much better.

Me too! I often let off the gas on purpose just to hear it and see the reactions of others around me. Most people think it's cool.

When I want to tone it down I switch driving modes to Tour.

SATINSTEEL1LE · 08-14-2022, 04:19 PM

Quote:

Originally Posted by SomeGeoffGuy

It's tuned in - they add gas on de-cel. There is a time limit on it too, so if it stops, you can tap the gas and get it going again.

-Geoff

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

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

armycop71 · 08-14-2022, 09:20 PM

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.

08-13-2022, 11:54 AM	#1
David Zak Drives: 2020 Cadillac XT4, 2022 LT1 Join Date: Jan 2022 Location: Warren, Ohio Posts: 38	NPP crackling and popping I just love that sound but was wondering is that someone Chevy engineers caused to happen? My friend says he hates it and that it sounds artificial. He prefers the exhaust noises from his 1969 Hemi Roadrunner.

08-13-2022, 12:59 PM	#2
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 12,023 View My Garage	Gm changed the tune in 2019 to produce way more pops and crackles. They were fairly decent in 2016-2018 cars, meaning just 2-3 pops if you wanted to induce them, as opposed to several seconds of popping and crackling in 2019+ model years. There is a thread here with the relevant table (minimum final spark) and the changes displayed in HP Tuners, in case you want to tune this back to the previous state. Needless to say, such changes will void the powertrain warranty, and no, Chevy service departments won't be willing to do this. __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18

08-13-2022, 01:12 PM	#3
Chrome383Z Drives: 2019 Camaro 2SS Join Date: Aug 2020 Location: McCordsville, Indiana Posts: 621	Mine are tuned out. I hated them. Sounded stupid… IMO. __________________ 2019 Shock 2SS A10. 2650@10psi/LPE HPFP/XDI+30/LT4 LPFP+JMS/Soler 95mm/Rotofab, E65, CSP 2” Headers/GESI GenII Cats. MM Wild/GM SG3 suspension/1LE Brakes, Velgen VF5 Wheels/GY SC3. JRE Tuned.

08-14-2022, 04:01 AM	#6
Wintermute Drives: 2020 LT1 Join Date: May 2020 Location: WA Posts: 75	It's a side effect of direct injection, but Chevy tuned the car to accentuate it. __________________ Too weird to live, too rare to die.

08-14-2022, 08:35 AM	#8
SomeGeoffGuy Drives: 2023 2SS Convertible Join Date: May 2009 Location: Metro Detroit Posts: 1,099	It's tuned in - they add gas on de-cel. There is a time limit on it too, so if it stops, you can tap the gas and get it going again. -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.

08-13-2022, 02:49 PM	#5
BLACK21SS Oldman w/a teenager brain Drives: 2022 ZL1 A10 Join Date: Mar 2021 Location: East TX Posts: 159	I like it. I had an SRT-4 modded to 375 HP with a 3” side dump exhaust. It was fun driving up to someone blocking the left lane on the Interstate. I’d floor it, left off as I approached them, and side by side it would sound like a 12 gauge went off. It would certainly snap them out of their stupor.

08-14-2022, 08:08 AM	#7
Booher Drives: 2019 zl1 6 speed Join Date: Jul 2017 Location: Lake Havasu Arizona Posts: 1,025	My 2013 frs never once popped or crackled bwfore or after tune and that's direct injection. So idk, if all di engines do that, could be wrong, just my experience

08-14-2022, 09:43 AM	#9
Chutzpah Drives: Wild Cherry LT1 Join Date: Dec 2016 Location: Massachusetts Posts: 1,935	For the most part I dislike these…it’s just over the top. Deep burbles = good… Loud gunshots = stupid. It sounds like the cat converters are going to disintegrate…. The biggest problem for me is if I want to pass someone or pull out quick without drama, it just can’t be done (sounds like you’re trying to make a statement). Why GM thought everyone would love this or not give the option of linking the increased pops and crackles to a driving mode / some other software, just makes no sense to me. I’d pay GM a couple hundred bucks to change it back to the way it was 2016-2018.

08-14-2022, 11:26 AM	#10
retmil Drives: 2022 Wild Cherry SS Join Date: Aug 2012 Location: Germantown, Md Posts: 319	NPP Crackling and Popping Chutzpah - I agree with you. The loud popping and crackling sounds too much like a tuner exhaust on a four cylinder engine. I disliked it so much that I did a cat back exhaust swap which eliminated about ninety percent of the racket. I also find that if I change the engine sound to Stealth the tone is a little deeper with less crackle.

08-14-2022, 09:20 PM	#14
armycop71 Love my Satin Steel LT-1! Drives: 6-Speed LT-1... Join Date: Aug 2016 Location: Kentucky Posts: 497	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. __________________ 2022 SATIN STEEL *LT1* 6-Speed Man\|Carbon Flash Wheels Technology Pkg\|NPP\|Satin Blk Pkg ZL1 Rock Guards\|Red Knee Pad Set PBC LT1 engine built by Debi Lewis

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