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Yeah if you take off your pod, look at the compressor wheel and see if it has been hitting the compressor housing, this will make an extremely weird (and bad) noise. If it is then, you have too much free play in the turbo and you will be looking at a replacement or a rebuild. Also does it blow any smoke? on idle, when you rev it? on boost? if no to all of these questions then no your turbo should be fine.

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Dude, its a compressor wheel, its inhaling a lot of air. Its supposed to make some noise and there is a very good chance it will sound like a whistle sometimes.

:bahaha: so that's why my induction noise is so loud :D

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mine had the std turbs whistle (which is part of the reason why we like turbos, aside from the performance gain) but when the boost came up the whistle turned into a harsh hissing sound.

i took the heat shield off to have a look & discovered that 2 of the 4 bolts holding the turbo to the exhaust manifold were missing! got some more bolts & problem solved.

if its a hissing/squealing sound at all, check for leaks, missing bolts, stuffed gaskets, etc

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When I fitted the cold air intake the turbo became hell noisy.

Even on 0psi you can hear the turbo pssssssssssssshhhhhhing away. When making boost it is quite loud especially out side of the car.

Sounds like the turbo from trucks whistling away but a little more airy ssssssssssssssshhh sounding.

I've had 2 stuffed VG30 turbo's on my RB20. The first one had spots of rust on the bearings which caused you to hear a really really loud wirring noise even on idle. The second had excessive shaft movement where the compressor was touching the housing. The turbo was strange at first as some times it would make the high pitch squeel from the compressor touching the housing then other times it wouldn't until a couple of days later it was constantly there when making boost over 7psi.

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