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The vacuum is there to CLOSE the wastegates and generate boost. If the vacuum system fails, a hose or nipple is broken, or a solenoid valve sticks, then you get 30FF - boost pressure too low.
Bad MAP sensors? Any codes for intake pressure plausibility? Also, the wastegate shaft that goes into the turbo can wear and bind and may not be releasing properly, which would cause your excess boost problem. I have a customer car in the shop that has a low boost condition because the WGA cannot shut the rear wastegate.
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RRT
E92 335i/6MT with stuff and things
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