Mate Please read this whole forum.....the answer is here.....Also read nhluhr above post.....
Originally Posted by nhluhr
The dumbest thing I've ever heard would be somebody automatically assuming they have boost creep before eliminating other possibilities such as incorrect wastegate duty cycle mapping, incorrect orifice size on the boost control lines, stuck/siezed wastegate, etc etc.
Just because you're overboosting does not mean you have reached the physical limit of boost creep.