[speedhunter93]

I have a 335i with downpipes and intake on a cobb tune (new and updated maps) and whenever I try to accelerate past 3-4.5k rpm whether on stock boost or increased boost my car throws a p3100 and 30FE overboost code with a message at bottom saying wastegate #1 closed? Checked for boost leaks on chargepipe and vaccuum lines and found none what could be the issue? Possible solutions

[Opo]

Have all the vacuum lines ever been replaced? if not, the odds are there is probably a leak/break in one of them somewhere. They're not always easily spotted visually.

http://www.e90post.com/forums/showthread.php?t=546560

[RSL]

Make sure the downpipe clamps aren't in positions that block the wastegates from opening.

[jayzF30]

This sounds to me like a mechanical hardware issue, maybe you have a faulty wastegate actuator that is sticking and causes boost to spike.