Thread: DCT noises...
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      10-28-2012, 12:51 PM   #3
Asbjorn's Avatar

Drives: ESS twin-turbo roadster (E89)
Join Date: Mar 2012
Location: European in China

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The part they replaced is displayed here

code 28107842385

The noises described in 2) and 3) are very different actually. You may be right that the noises described in 1) and 2) both come from the differential and not the DCT itself! My differential does seem to have a little slack. It makes sense that it could make such a noise when changing from no load or engine braking/reverse to normal load as it does in 1) and 2). And as you said, that would not be such a big concern. Its the DCT which is expensive to replace...

The more quiet clicking and whining noises are clearly related to the DCT preparing to change gears and the revs. And at the same time they are related to temperature as explained...

You do not get any of these noises at all?
Little known facts about BMW: 1) The N54 is still in production and used in the current Z4 35i and 35is. 2) In a Z4 you can get sport+ steering combined with normal suspension etc by selecting DSC=off. (Update: DSC=off also offers sports steering in the M135i) 3) All Z4s with 19" wheels are still only offered with the worst performing OEM tires ever sold with a DCT equipped BMW (Potenza RE 050 RFT).