Why do you think the turbo is dead? If it's just poor performance, there
can be many other causes (N75 valve, air-mass meter, vacuum pipes, brake
lights disconnected (!)) and actual turbo failure is likely to show up
in other ways, often involving smoke and oil loss.
The power is lost after 2500rpm and we've changed and checked already
a lot of things (like air-mass). We'll try another (used) turbo to
make sure whether the turbo is really the cause of the troubles.
There's no oil-leakage or smoke or so.
We've changed the turbo with another turbo (that works fine for sure)
and the results stay (-> no power above 2500rpm).
What else (apart from the already mentioned things) could be causing
this lack of power?
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