BMW 3-Series (E90 E92) Forum - View Single Post - does the 335Xi have the option to be RWD like an STI?

ajsalida · 10-22-2010, 01:05 PM

As far as I know the RWD is via a conventional driveshaft from the tranny straight through the transfer case to the rear diff (no break). The clutches in the TC to the front diff work off that shaft. That is why the most torque that can go to the front is 50% (50/50 F/R split when clutches lock up).

edit: this is probably one reason why there is no 4WD hi/lo. ANyway here is a cutaway of an xdrive transfer case

http://www.awdwiki.com/xdrive.html

10-22-2010, 01:05 PM	#25
ajsalida Colonel 226 Rep 2,387 Posts Drives: 95 M3, 02 R1150GSA, 09 335xi Join Date: Aug 2010 Location: SW USA iTrader: (2)	As far as I know the RWD is via a conventional driveshaft from the tranny straight through the transfer case to the rear diff (no break). The clutches in the TC to the front diff work off that shaft. That is why the most torque that can go to the front is 50% (50/50 F/R split when clutches lock up). edit: this is probably one reason why there is no 4WD hi/lo. ANyway here is a cutaway of an xdrive transfer case http://www.awdwiki.com/xdrive.html Last edited by ajsalida; 10-22-2010 at 01:16 PM..
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