l just had changed my turbocharger in local garage.(turbo l had bought in the scrap yard ) and after this changeengine make a noise when accelerating which sounds likeone of the belts istouching something, butthis noise comes under the engine and looks like somewhere near turbo.l have been told this is faulty turbo, but before fitting l have checkedfan was not playing and turbo was removed fromrunning engine.any ideas thanks?

might be the dump valve thats at fault

Sounds like the forward joint in the exhaust system (spring loaded) opening under acceleration.