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      10-24-2011, 01:14 AM   #1
eNCore
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BMW head technician's input on differential noise tolerance range...

I have a 2011 DCT. I've been getting a light knocking/clunking noise from the car when it comes to a stop (stop sign/stop light) and at low speed (0-10 mph). I did a lot of research on the forum but all I can find is differential noise when turning and clutch noise from 6MT. The noise is quite small so I can't really record it. I asked and went on a test drive with a BMW head tech and he told me it's from the differential and it's normal. I asked if they can fix it by adding the differential oil and he told me it's only for noise when making turns. He also told me there is a sound tolerance range for the differential to be considered normal.

The noise is pretty light and can only be heard when the windows are up and without music, but it is quite annoying when you pay attention to it.

My question is...am I the only one getting this noise, or many are getting it too, or it's there many just don't notice it? Or I just have the bad luck of getting a differential that just barely made it within the tolerance range of being considered normal?
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Last edited by eNCore; 10-24-2011 at 01:28 AM.
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      10-24-2011, 03:55 AM   #2
Radiation Joe
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It sounds like you're talking about the gear rattle at a stop. If you push in the clutch, does it go away? If it does go away with the clutch pushed in, it's the gear rattle which is normal.
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      10-24-2011, 04:49 AM   #3
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this is exactly why auto companies like bmw will continue to put more sound deadening material in the cabin and then enhance the engine noise with fake noise from sound system. the mechanical differential in the M3 is a technical masterpiece. I would say its better than whats used in Porsche GT cars.

don't obsess over the little stuff. enjoy the car. if you want dead quiet bmw product, go to a Roller.
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      10-24-2011, 09:11 AM   #4
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"DCT" people! What you hear is normal gear "chatter" from the transmission. This is completely normal on the DCT. Also took me a while to get used to it.
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      10-24-2011, 02:43 PM   #5
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It's normal...no worries.
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