Just a quick report back now that I have driven the car to work, at 10kOhms the car is much better, the lag has gone and its boosting to a stable 18psi.

I will try a stock setting, 10kOhms and 11kOhms tomorrow (if the weather holds) and see what the difference in times are.

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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free!