Different sound inquiry
I have a 2017 ZL-1 M6 that was built in early April 2017. I now have almost 10k miles (I can't stop driving it!) About a thousand miles ago, I started hearing a "different" sound from the engine bay. For the first 9k miles, I would hear the supercharger whine when I cracked the throttle open, and I came to feel that it was normal as most of you do, I'm sure. Since about 9k miles, I now hear a continuous whine of sorts. It's hard to describe, but it's a cross between an old-style cavitating power steering pump and a cicada singing on a warm summer day. The whine follows engine RPM. At idle, it's not there. With the windows up and the sound system on, it's barely audible. Driving with the driver window down, you can hear the sound echo off of a nearby curb, building, or other structure. When I crack the throttle and engage a little boost, I don't really hear the supercharger as I used to because of this whine. There's no other symptom, and the car runs fine and strong as it ever did.
Does anyone have an idea what it might be? My air cleaner's full of cicadas and they're mad? :iono: Am I just hearing the supercharger all of the time now? I hope it's not bearings or something. I'll just sit here and :popcorn: Thanks! Tara :wub: PS: I am the victim of both the rattling, loose sway bar endlinks, and the high riding front suspension. I plan on taking it in to get the front springs ordered in the near future. :dizzy: |
What exhaust mode are you running?
I noticed a kind of whistle in stealth mode. -bobby |
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Tara :love: |
Is the sound there when you get the SC into the boost side? Thinking it could be a wastegate flutter but I'm spit balling. Anyway you can record the sound and post?
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Thanks for any input! |
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Curious if it's the SC belt. The 'vettes are having theirs replaced. Description doesn't sound the same, but it's the only thing I can think of.
http://www.corvetteactioncenter.com/...-afm-1357.html |
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Having said that, Dethsupport may be onto something with the pulley belt. |
Bad idler pulley bearing?
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Thanks! |
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Thank you for any and all ideas! Tara :wub: |
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I'd agree. Could be a worn belt, but there are a whole bunch of idler pulleys on the supercharger belt route.
I'm still not sure what's up with that service bulletin. It lists 2017 ZL1, but the main issue is related to AFM and noise when switching between modes. So that's a little odd. I just checked the belt on my 2018, and it's the same part number that came on the '17 models. So it doesn't look like a production change was made. What's also funny is that the Gates HD belt in that bulletin is longer than the stock belt. I'm not sure why. Usually that's the opposite of what you want to do to limit belt slip in a blower car. That said, I decided to order a Gates RPM belt in the stock size. Why not? It should perform better and last longer than the stock belt. I figure having one in the garage isn't a bad idea. |
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