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      02-15-2017, 06:47 PM   #14
drwillb
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Drives: e30 M3, e30 M3, e46 M3
Join Date: Aug 2008
Location: northern NJ

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What is the reason/function for the loud cold start?

From what I read on a post somewhere I think the sound comes from the wastegates being held open. I imagine that must be to protect the turbo from spooling up before there is adequate oil pressure and flow, especially on a cold day. Is there any danger, then, to not allow for this safety period by closing the waste gates?
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