ECU tuning in Europe

Originally Posted by ByThaBay

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In addition, and this is probably the most important part, you can't just go off of a small sample. You need to drive the car as conditions change and repeatedly log the vehicle to determine the ideal values for each cell. One day your car might pull timing, the next day it might be fine, so the best value will lie somewhere in between. It's common to see knock sensors desensitized or turned off completely to avoid having to do this extra work.