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Discussion Starter #1 (Edited)
Hi, too keep it short; i had a broken turbo some years ago. Had it replaced by a "bmw specialist" garage. They did not check the cause of failure and just put on a new turbo while i told them to check it thoroughly. Within 6 months i was hearing a whistle. Thought the turbo was on it's way out again. A whole back n forth with the garage but basically they did nothing. I discovered that the whole issue was probably down to a clogged cat. which caused too much backpressure in the turbo. So i was so done with it and had the whole cat. removed for a downpipe and even had it remapped + dpf off after checks. The turbo pressure was normal so i did not understand that whistle. It was not the siren type of whistle but more the blowing of air starting from 1500 rpm and is a high pitch whistling noise that changes with the rpm. Also there is no real powerloss. I think i was just in time by removing the cat. but i think it did some damage to the turbo at the time. Due to other circumstances and being busy i just left it as it was because it was not that loud. Now after i think 2.5 years the noise has become worse and i can also see soot on the turbo housing.( see pictures) So my question is basically, what do you guys think is wrong with the turbo and what is the best way to fix this? There is no play on the shaft and it sounds more like air to me. Is the gasket inside blown? Do i need to tighten the screws? Is there anyway to fix this without replacing the whole turbo. The car is a 320D E90 M47N2 engine. These garages out here are not to be trusted. Many thanks in advance
 

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Discussion Starter #3
Too bad nobody responded..Just saw that it got worse, i can see oil leaking. So i think the turbo needs to be replaced. Will bring it to a garage and see what they say this time.
 

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