Oh boy, were the others even trying? You've got a GREAT place in that list! I bet it has more to do with the driver than the car. The 16 valvers should be about perfect for autocross.

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1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.