Thanks alot for the file. Finally I could test it this weekend.

My problem is still there. Maybe it is a problem with the turbo itself, but there are other symptoms, that doesn't look like a permanent turbo failure:

Sometimes when I am accelerating with lets say 50 % load and I get over roundabout 2200 revs, the car is accelerating like pulsing once a second. And I have a noise like the air is squeezed through some rubber to the outside.

What if my sealing ring for the turbo is done.. and it sucks fresh air at that place, which isn't sensed by the air mass sensor then..? But it is maybe the wrong forum for such questions :)

Anyway! Thanks alot for your help! I will stick to the software topic as well, because it is just nice to know, how things behind the throttle work :)

Cheers!
Steffen