×××UPDATED×××Noise /whistling sound

[LuckyZL-1]

Mine makes a whistling sound also, has done it for as long as I can remember but it only does it when not in boost. If I'm just cruising I can hear it but when you put the hammer down it quits. Not worried about it here! Enjoy your car buddy.

[big dave]

Very interesting thread. I just had my blower changed a couple weeks ago and immediately heard this same noise as soon as I picked the car up. It is very annoying. It definitely wasn't there before. It was particularly noticeable today when I was driving through an underground garage. A trip to the track showed that it seems to be performing ok though.

[djnice]

Mine has that nose and I still have the original supercharger. It seems slightly louder with the catch can and oil cap air breather installed. Dealer can't hear it, but they can't hear anything.

[TobysZL1]

All right guys that are following this thread. I'm the original poster and have posted to this thread a couple days ago not realizing which one it was cause it's been awhile since this thread got reopened.
Anyways I do have some info that I would like to share.
I now have a 13' auto ZL1 that just got the supercharger replaced as well for the marbling noise. So far no issuers since replacement.
Well the car in question that I started this thread on was my 13 ZL1 manual. I had the blower replaced. Then shortly after the winter months after taking it out I heard this noise that you can hear in the video I posted to this thread. This high pitch noise was annoying to me but no one could really tell me what it was. Until I went down to my local speed shop. Well my dude came out, listen to it and said hey you got no worries this is a normal attribute of the mods you have done. particularly your lower 10% pulley. Well this was a relief to hear that it was normal but I wasn't a 100% convinced but I excepted it for the time being. It so happens that when I brought him the car to listen to, it started making the marbling/rattling noise again, which was unbelievable cause I had it replaced already and no one could explain this. So I brought it to Chevy and they too confirmed it and replaced it AGAIN under warranty , making it the second blower replacement for the car cause of the marbling /rattling. Huh!! Very weird but, hey whatever.
So got it replaced and low and behold that noise I posted in this thread, that whistling in question from the video was still there. Now I was convinced that the guy from the speed shop was correct in telling me that whistling was normal of my mods. It had to be, another whole blower and it was still doing it. Right? Yep definitely definitely was the mods (10% pulley). I knew this without doubt shortly after when I demodded the car. I put it back to 100 percent stock when I traded this car in for my new auto. When put back to stock this noise was completely gone. Now I had the proof.
Also when I put these mods back on my new auto, you could immediately hear it again, proving it was the lower pulley. It wasn't as definite in the auto, maybe cause of it being an auto and it may have dampened a little cause of this but definitely there. I've since then went to an 18% lower and headers and now cannot hear it at all.
So if you have the noise I posted in this thread with a lower pulley thats where it's coming from and it is normal and not causing any harm whats so ever. Now the noise was a little irritating for me obviously but once I found out it was normal of my mods, it made dealing with it a lot easier. Not that I had to put up with it for long cause of the trade.
Hopefully this help guys.

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[big dave]

Originally Posted by TobysZL1

All right guys that are following this thread. I'm the original poster and have posted to this thread a couple days ago not realizing which one it was cause it's been awhile since this thread got reopened.
Anyways I do have some info that I would like to share.
I now have a 13' auto ZL1 that just got the supercharger replaced as well for the marbling noise. So far no issuers since replacement.
Well the car in question that I started this thread on was my 13 ZL1 manual. I had the blower replaced. Then shortly after the winter months after taking it out I heard this noise that you can hear in the video I posted to this thread. This high pitch noise was annoying to me but no one could really tell me what it was. Until I went down to my local speed shop. Well my dude came out, listen to it and said hey you got no worries this is a normal attribute of the mods you have done. particularly your lower 10% pulley. Well this was a relief to hear that it was normal but I wasn't a 100% convinced but I excepted it for the time being. It so happens that when I brought him the car to listen to, it started making the marbling/rattling noise again, which was unbelievable cause I had it replaced already and no one could explain this. So I brought it to Chevy and they too confirmed it and replaced it AGAIN under warranty , making it the second blower replacement for the car cause of the marbling /rattling. Huh!! Very weird but, hey whatever.
So got it replaced and low and behold that noise I posted in this thread, that whistling in question from the video was still there. Now I was convinced that the guy from the speed shop was correct in telling me that whistling was normal of my mods. It had to be, another whole blower and it was still doing it. Right? Yep definitely definitely was the mods (10% pulley). I knew this without doubt shortly after when I demodded the car. I put it back to 100 percent stock when I traded this car in for my new auto. When put back to stock this noise was completely gone. Now I had the proof.
Also when I put these mods back on my new auto, you could immediately hear it again, proving it was the lower pulley. It wasn't as definite in the auto, maybe cause of it being an auto and it may have dampened a little cause of this but definitely there. I've since then went to an 18% lower and headers and now cannot hear it at all.
So if you have the noise I posted in this thread with a lower pulley thats where it's coming from and it is normal and not causing any harm whats so ever. Now the noise was a little irritating for me obviously but once I found out it was normal of my mods, it made dealing with it a lot easier. Not that I had to put up with it for long cause of the trade.
Hopefully this help guys.

Sent from my SM-N910V using Tapatalk

Well this is good news for those who have replaced their lower pulleys...but for us that didn't...

[TobysZL1]

Originally Posted by big dave

Well this is good news for those who have replaced their lower pulleys...but for us that didn't...

Yea for those who haven't. Even know your noise maybe similar. It is not what I had. Good luck in tracking it down though.

I just wanted to update this thread with my findings.

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