The problem is solved. I finally found the problem. I have never seen it before on these old turbos, but a part of the wastegate-flap has come off
So thats why the boost was missing.
I found a replacement turbo, from a 940 D24TIC. Its another type, so a had to redo some of the plumbing. A funny thing is that i had problems with the oil feed line. The original one was in the way of the WG actuator. No problem! Because I got the oilfeed from the 940 turbo. But that did not fit at all! Quite strange, so to make it work (on a sunday, with no possibility to get other parts) I had to make another bracket for the actuator, and lengthen the rod.
Old one on the left.
Before modification.
After.
/Dennis