Quote:
Originally Posted by junlikesf30s
confirmed!!!!
it's the Diverter Valve or Electronic Waste Gate. stuck a mic down both sides of the lower engine bay and recorded, it's coming from the hot turbo side. in 1st and 2nd gear, the DV/EWG is stuck open from 1k-2.5k RPM. I'm assuming BMW did this so you aren't building boost/too much power in low gear low RPM city/traffic driving; would help with MPG, drivability, heat soak.
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You can datalog WGDC which basically tells you the position of the WG for an EWG and you can see how open it is