Any idea what could be causing this whine?

http://www.youtube.com/watch?v=n8pbrHPWgYA

 

It's your supercharger and it's normal from what I heard on your video.

 

What he said

 

It is kinda tough to tell, but if there was s sudden change to the sound, the SC does get noiser with a higher pitched whine, and chain vlanky sound as the sc water pump gears fail due lack of lube...
Like I said, sound on a vid clip is hard to listen too...
But if you just noticed a sudden change....

 

Sorry I'm no help or have any suggestions but I just wanted to point out that it doesn't sound normal to me. At least mine doesn't sound that way when idling.

 

It's definitely not the supercharger. I know what that sounds like. This was a sudden change after I got back from a trip. Several people told me it sounds like a belt tensioner bearing about to go.

 

Sounds like a good place to start.

 

My '04 S doesn't sound like that so I'd second the advice to check the belt tensioner or idler pulley bearings. Definitely sounds like a belt-related issue from the constant noise. My old VW Scirocco sounds a bit like that if I overtighten the manual timing belt tensioner (no auto tensioner on the old girl).

Eric