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The Car: European 95er 850T5, 120TKm, with 290 BHP ECU upgrade (BSR Sportsman) installed at 70TKm.
No noticeable oil consumption, no white or blue smoke at the tailpipe.
No oil in cooling water and vice versa.
Since approx 4 weeks I notice the following symptoms:
When accelerating full throttle, the Turbo builds up pressure beginning at 2500RPM (as usually). From approx. 3500 it stays constant (lower than usual – 75% of overpressure scale of pressure gauge) till approx 5000RPM.
Then pressure goes to max. until shifting gears is necessary (as usual again - almost 100% scale of pressure gauge).
Before these symptoms occurred, the pressure built up as stated above, but reached its max value beginning from 3500RPM and kept there until the end of the RPM range.
An other strange thing is the following: When driving at 4000RPM with the turbo pressure gauge at ±0 and then pushing to full throttle, the pressure builds up fast hitting max level (almost 100% scale of pressure gauge) and then falls back to the level where it is when accelerating out of the bottom (75% of overpressure scale of pressure gauge).
I was told that this is the beginning of the end of a Turbo life. But before spending UD$ 1000 for a replacement, I want to make sure that I am on the right pass (event if it's sad but true).
Any experience, proof, suggestions or ideas on that?
Many thanks in advance.
Erik Forker
PS: Sorry for my poor English
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