delete thread

[SpeedGrid]

delete thread

[ctracer]

sounds kinda like a belt slip or something

[Fivefingerdeathpunch]

Sounds like a idler pulley and or tensioner pulley.

Should be an easy fix, you just have to narrow it down to which pulley.

Take the Supercharger belt off and do the revs again and see if it gone or still there.

If gone, then you know its 1 of the 3 pulleys on that belt.

If its still there, then its a pulley that runs off the accessories belt.