Quote:
Originally Posted by T-Cut
Mine does is when accelerating, specifically at the point when you press the clutch to go up a gear. TC
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That could be the internal dump valve then. When you change gear the dump valve releases turbo boost presure into the exhaust so that the turbo doesn't stop spining.
The wastegate will open and close a full times a second (this is a metalic sound) to prevne the turbo from over boosting under hard acceleration.
You will hear these noises more if you have the window down or if you have fitted a performance air filter.
They are perfectly normal noises on a turbo car.