I've experienced that a MBC can mess up, I do not know all the different models, but TurboXS has one which I know, and it utilize a spring with a ball (a ball bearing type ball). Sometimes it happens that the ball gets stuck. And you will have to dismount it, and put it back together...
Also remember that, when using a MBC, you will open the wastegate(s) even if the wastegate-spring is set to more psi than the current boost when the MBC opens.
So... If the MBC is messed up, it will help the wastegate(s) to open earlier than the spring is set to...
If you bypass the MBC you should get the pressure that the wastegate(s) are set to (if you have traction).... I would try it in high gear and see how the pressure builds up...
Sincerely,
Morten
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1966 - Chevelle SS 396
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1992 - BMW M5 Touring
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