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      07-07-2020, 03:56 AM   #342
HighlandPete
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Drives: BMW F11 535i Touring
Join Date: Mar 2007
Location: Scotland, Highland Region

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Quote:
Originally Posted by berghagen View Post
Update - first call back:
They called me back this morning, said they hear the sound already from 5km/h. Waiting for further information. I think some of the best technicians in Sweden are on my car.
From 5km/h.... that begs a few more questions. What can generate the sound from such a low road speed? Is it vibration or grinding?

If from rotating parts, we have to wonder if it is in some way engine bay generated, as that is where parts are getting more rpm and potential vibration frequencies, at such low road speeds.

I wonder if the sound is the same "on and off" the throttle, at low road speeds.

So strange, if can be at a very low speed, on the other hand, known to change intensity with road surface at higher speeds. Puzzling, to say the least.
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