Supercharger noise on cold start

Jverado · 01-20-2021, 02:06 AM

Sometimes when I cold start my car I'll hear this sort of whirring/rubbing noise that sounds like it's coming from the supercharger and it seems to go away after 30-45 seconds. Has anyone else experienced this and if so, is it anything I should be worried about? The car seems to be running fine.

LT4Greg · 01-20-2021, 06:42 AM

Yes mine has the same noise which sounds good to me. There’s a supercharged LT4 under your hood!��

SJFGTO · 01-20-2021, 06:44 AM

Quote:

Originally Posted by LT4Greg

Yes mine has the same noise which sounds good to me. There’s a supercharged LT4 under your hood!��

^^^Agreed^^^

JSH · 01-20-2021, 07:52 AM

Quote:

Originally Posted by Jverado

Sometimes when I cold start my car I'll hear this sort of whirring/rubbing noise that sounds like it's coming from the supercharger and it seems to go away after 30-45 seconds. Has anyone else experienced this and if so, is it anything I should be worried about? The car seems to be running fine.

No, mine doesn't make any noise on startup

LT4Greg · 01-20-2021, 08:17 AM

It seems like the more miles you get on the car, the noise is noticeable. I bought mine used with less than 500 miles and in the beginning the noise wasn’t there but since I have almost 17,000 miles it’s more noticeable.

zl1_things · 01-20-2021, 09:09 AM

All jokes aside, my '17 used to make a kind of bearing going bad sound during cold starts. Then was fine after a minute or two of running.

Thought maybe the supercharger bearings were going bad or maybe something wrong with the pulley system.

After listening around in the engine bay after a few cold starts, I figured out it was a couple loose bolts on my passenger side header. Not sure why it made the sound it did, but tightened them back up and no more sound.

LT4Greg · 01-20-2021, 11:52 AM

Quote:

Originally Posted by zl1_things

All jokes aside, my '17 used to make a kind of bearing going bad sound during cold starts. Then was fine after a minute or two of running.

Thought maybe the supercharger bearings were going bad or maybe something wrong with the pulley system.

After listening around in the engine bay after a few cold starts, I figured out it was a couple loose bolts on my passenger side header. Not sure why it made the sound it did, but tightened them back up and no more sound.

Do you have stock exhaust manifolds or long tube headers?

Revalot · 01-20-2021, 07:30 PM

Get someone to start it with the hood up while you look and listen!
Better to be safe then sorry !

SSallday · 01-20-2021, 09:25 PM

Are you referring to this noise?
https://youtu.be/V6Mb9PRsD1Q

zl1_things · 01-21-2021, 03:59 PM

Quote:

Originally Posted by LT4Greg

Do you have stock exhaust manifolds or long tube headers?

All stock.

It really didn't sound like a header leak at all. Kinda made a repeated whine/ching sound.

LT4Greg · 01-21-2021, 05:32 PM

That’s the sound mine is making but somewhat faint. It stops when it warms up. I still say it’s the supercharger and normal. I know and have heard supercharged engines sitting at idle whinning away so that’s why I think it’s a normal sound that they make. This is the first supercharged car I have owned and it’s definitely different sounding than a naturally aspirated engine.

Bangkok_ZL1 · 01-22-2021, 08:01 PM

Quote:

Originally Posted by SSallday

Are you referring to this noise?
https://youtu.be/V6Mb9PRsD1Q

I was going to say sounds like a typical cold belt issue until I heard this..... WT????

Jverado · 01-22-2021, 08:19 PM

Quote:

Originally Posted by SSallday

Are you referring to this noise?
https://youtu.be/V6Mb9PRsD1Q

Yes! that's exactly it and just like in the video, it breaks up and then goes away.

Lilwilly · 05-09-2021, 02:51 AM

My new ZL1 makes the same noise - what was the problem / solution?

https://streamable.com/ak39hx

01-20-2021, 02:06 AM	#1
Jverado Drives: 2004 Silverado, 2020 ZL1 Join Date: Oct 2016 Location: WA Posts: 84	Supercharger noise on cold start Sometimes when I cold start my car I'll hear this sort of whirring/rubbing noise that sounds like it's coming from the supercharger and it seems to go away after 30-45 seconds. Has anyone else experienced this and if so, is it anything I should be worried about? The car seems to be running fine.

01-20-2021, 06:42 AM	#2
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,872	Yes mine has the same noise which sounds good to me. There’s a supercharged LT4 under your hood!�� __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

01-20-2021, 08:17 AM	#5
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,872	It seems like the more miles you get on the car, the noise is noticeable. I bought mine used with less than 500 miles and in the beginning the noise wasn’t there but since I have almost 17,000 miles it’s more noticeable. __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

01-21-2021, 05:32 PM	#11
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,872	That’s the sound mine is making but somewhat faint. It stops when it warms up. I still say it’s the supercharger and normal. I know and have heard supercharged engines sitting at idle whinning away so that’s why I think it’s a normal sound that they make. This is the first supercharged car I have owned and it’s definitely different sounding than a naturally aspirated engine. __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

05-09-2021, 02:51 AM	#14
Lilwilly Drives: Camaro ZL1, Durango SRT, Mustang GT Join Date: Feb 2021 Location: Palmer Alaska Posts: 16	My new ZL1 makes the same noise - what was the problem / solution? https://streamable.com/ak39hx __________________ Camaro ZL1, Durango SRT, Mustang GT, Mazda Miata

01-20-2021, 09:09 AM	#6
zl1_things Drives: '17 ZL1 A10 Join Date: Jun 2020 Location: Sacramento CA Posts: 59	All jokes aside, my '17 used to make a kind of bearing going bad sound during cold starts. Then was fine after a minute or two of running. Thought maybe the supercharger bearings were going bad or maybe something wrong with the pulley system. After listening around in the engine bay after a few cold starts, I figured out it was a couple loose bolts on my passenger side header. Not sure why it made the sound it did, but tightened them back up and no more sound.

01-20-2021, 07:30 PM	#8
Revalot Drives: ZL1/1LE parts added Join Date: May 2018 Location: Somewhere around Texas pines tress and smooth asphalt Posts: 627	Get someone to start it with the hood up while you look and listen! Better to be safe then sorry !

01-20-2021, 09:25 PM	#9
SSallday Drives: ‘18 ZL1 / ‘22 ZLE Join Date: Oct 2013 Location: PA Posts: 603	Are you referring to this noise? https://youtu.be/V6Mb9PRsD1Q

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