The car is a 91 and I think youre right about the over protection shutting down the fuel mixture. Any ideas on what I could do to up the power possibly adjust where the wastegate turns on at? I constantly read about guys turning the ALDA screw up on their cars, but as fat as I know thats not possible in my car as there is no screw on the ALDA
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Originally Posted by babymog
What year?
The line on the wastegate iin a '90/'91 SDL is pressure, not vacuum.
If you're getting to 1bar, the overboost protection should be shutting down fuel enrichment as if there's no boost (via ALDA pressure line / switchover valve).
I'm not sure that the original turbo is capable of holding up to 1.7bar, my local turbo shop tells me that it's easily good for 1.2bar though.
Just FYI, according to Mercedes the factory settings on the .970 are .85bar, and that's good for 135,000rpm.
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