Whistle while Boosting

[whiplash willy]

I just finished my SR swap, it is a completely stock swap. When I really step on it and start boosting I hear a whistle/whining sound while the throttle is down. When I let off it immediately goes away. I stopped and had a friend rev it. It would only make noise for a sec after he let off the throttle. It sounds like its coming from the stock Recirc valve area. Any ideas?

[Fireplug]

I just finished my SR swap, it is a completely stock swap. When I really step on it and start boosting I hear a whistle/whining sound while the throttle is down. When I let off it immediately goes away. I stopped and had a friend rev it. It would only make noise for a sec after he let off the throttle. It sounds like its coming from the stock Recirc valve area. Any ideas?

Are you positive it's coming from that area? If so, are you experiencing any boost leaks? (noticed by the car's boosting and/or boost gauge) I was thinking you might have a manifold gasket that's leaking where the turbo meets the exhaust manifold...

[whiplash willy]

My O2 Sensor was loose...that fixed it!

[NY S13 SR]

I had a "screamer" leak once - it was so loud it was shrill and shrieking and scared everyone around. I loved it, until I tightened the turbo outlet bolt and it went away.

-------------------------------Jeff HHeavy Throttle Performance Inchttp://www.heavythrottle.com

[whiplash willy]

Well the sound is back, Ive checket my AIV plug and O2 sensor, they are in tight. The weird thing is the noise only comes after the car is warm.