I've never heard a turbo make any noise at idle.

 

superchargers will

 

Yeah I know that. My comment was directed towards this part of your comment.

That's why I said turbos don't make any noises at idle like superchargers do.

 

im not sure on domestics, but my blower made a whining noise..did not sound like a turbo spool

 

I know that. That's why I pointed out that they don't sound alike. One whines and one whistles...for lack of better words.

 

Depends on the supercharger. My blower whines at WOT and whistles at idle. Doesnt do it as loud as a tubro would but still whistles. Centrifugal style blowers, depending on the motor, blower, and blow off valve can make somewhat of a tubro sound. Now it wouldnt sound like a tubro will blowing off, or spooling up but it will make a somewhat tubro sound. But that all depends on what brand everything is.

 

mine did whistle at idle to..mine was a jackson (eaton style)

 

yeah the roots style blowers pushing more than stock boost will whistle....