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      01-07-2020, 02:14 PM   #140
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 XXXX View Post
This non linear speeding influence of the sound could be that it is the steering. The sound changes by the speed, but not follow it completely as a bad bearing would do. The gearing of the steering on m-chassi cars is depending on speed but probably just in an interval.
I'm not following how the steering rack could be generating this problem, without it being obvious as you steer. Driving straight ahead, there shouldn't be anything moving within the rack generating noise. Servo motor is stationary.

If it is the rack, I'd expect it to change sound as you move the steering wheel a few degrees each way, at various driving speeds, and require changeable torque, to assist the movement.
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