New belt and tensioner whirring

[southernnaturelover]

The old tensioner on my Element was squeaking so I replaced it and put on a new belt. Now when I rev up the engine I can hear a slight whirring noise, like a turbo spooling up. I don't see anything that appears to be in a bind, and I don't see any damage to the belt. I have read where new belts need to 'break in' a bit and the noise will go away. Is there any truth to that?

I will say this tensioner is pretty tight (compared to my other vehicles), but the old one was too.

[popwar]

Sometimes happens when the serpentine belt is too tight. Do you see any adjustment bolt on the alternator?