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      03-12-2013, 05:44 AM   #35
mob17
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Drives: E92 335D
Join Date: Mar 2012
Location: East Midlands, UK

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Quote:
Originally Posted by Nigelo View Post
Main issue is the final drive ratio difference. The M3 diff comes in two OEM final drive ratios - Manual is 3.84, DCT is 3.15. Compare this to the 335d fd of 2.81. This means that only the DCT one is remotely feasible.

You'd need to work out what rpms would equate to which speeds, particularly at motorway cruise speeds as higher rpms could be awful to live with. I think divide the rpm at your cruising speed by 2.81 and times by 3.15 to find what rpm the new diff would give you for that speed.

Here's the thread regarding M3 diff into a 335i - should be exactly the same procedure.

http://www.e90post.com/forums/showthread.php?t=321625
Thanks for the info Will try and do some reading, its certainly not a simple drop in fit!
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2008 E92 335D SE - Ohlins
2010 E90 320D SE
1994 E36 318I SE
1996 E36 316I SE