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Could be a bearing, more likely a turbo mounting flange gasket or exhaust manifold gasket. These gaskets are pressed steel and when they blow out or start to leak they make a whistling or screeching sound, like blowing on the edge of a piece of paper. They also will only make the noise when the turbo is on boost as well.Could also be a boost leak from a loose hose clamp or pin hole in a hose.If it is a shaft bearing on its way out, you've got a bit on, because every time you hear that whistle it will be the turbo impeller touch the housing wich will be sending alloy shavings through your engine doubt it's a shaft bearing though because normally when they let go it's in a big way Good luck with it
BC, can you tell us a bit about the sort of life the turbo has had with your driving?Like:- Do you push the car along?- Do you cool down the turbo when you stop with an extended idle?- What engine oil have you used and how often was it changed?I'd be interested to know.
What's a good oil to use?
Quote from: db08 on February 20, 2013, 13:13:35What's a good oil to use?I use Olive oil for almost everything but Bran oil for really hot cooking as it has a very high smoke point.
On my last i30 (FD) I always cooled down after driving but that also had a faint turbo whistle.There was nothing wrong with it and I actually quite liked the sound to be honest. I think it is normal, providing it isn't excessive.
Yours sounds more like normal turbo noise.
The noise mine has you can hear clearly when its idling and you just light tap the accelerator (out of gear) and it makes a sound similar to a vacuum cleaner... ? Not the same?
what dealership carried out the repairs/warranty BC?