I've changed out the belt and its still doing it(under acceleration also between 0lbs-5-lbs of boost, and it does sound like a pig), i'm thinking it might be the bearings somewhere, or possibly in need of supercharger oil or changing it maybe? I've looked up other topics people have posted on this but i figured i'd pin point it exactly to whats wrong lol. thanks again for your feedback.

 

Anyone with this problem, or ever had it before?

 

What happens if you go above 0-5 psi? Could it be a vacuum/boost leak? When my intake manifold wasnt fully seals it would make a sound like that. It was ear piercing.

 

it sounds horrible and yeah it is ear piercing for sure, and it still makes the same sound even past 5 psi

 

What size pulley are you running and what belt? Also a possibility that your tensioner's shock is shot.

 

2.8 and a stg 2 belt no adjustable tensioner pulley or over sized either. changed the belt still doing it, my tuner said it could possibly be time to change the sc oil, every 100k miles im at 108k now

 

Squealing doesnt sound like old oil to me but who knows. Also when my intake manifold gasket was shot my car would make a terrible squealing sound when on the gas. I changed the gasket and it went away. Just a thought.

 

How would i check that? Also update today on my home i got on it a little bit in 3 gear and at about 5k rpms it started to just come to a stsnd still wouldnt go any higher, then i looked at my boost gauge and it went from 15lbs to 20 fast. Never has done this before

 

Your boosting 20psi? Do you have a cat? Could be clogged.

 

I thought gm sayed to change it every 30k