I have done the WG calibration several times using ISTA+
It is not a hard operation to do. But usually if your WG's do require adjustment, your car will immediately throw a drivetrain malfunction. It will throw the error even if you are 1mm outside of the calibration, so it is very sensitive.
Usually low boost with high WGDC is indicative of a boost leak.
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Quote:
Torque is a measure of an engine's ability to do work; Power is the rate at which work is done
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