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      10-25-2010, 09:15 PM   #63
tctic
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Drives: BMW E90
Join Date: Oct 2005
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Quote:
Originally Posted by AlexK View Post

X6M, just like X6, has a rear differential system called "Dynamic Performance Control", which is NOT purely mechanical (unlike inferior Torsen). It, just like regular xDrive system in vehicles like X3 and X5, is being controlled by car's computer, which uses various electronic sensors and electric motor to control the mechanical clutches.
http://www.caranddriver.com/features...ling-tech_dept
Exactly! The X5M and X6M uses basically the same xDrive system as all X3, late model X5, E9x xDrive and E6x xDrive with the exception of adding DPC. Sensors are STILL used to control the xDrive system. FYI, the xDrive system debuted with the previous generation X3. So some of the Youtube clips showing Quattro vs. old X5 isn't really valid anymore. The pre-xDrive AWD system used by BMW has a fixed proportion of power going to the front/rear wheels, unlike xDrive.

With the addition of DPC, the X5M/X6M can just better apply torque to the rear wheels than an open differential via individual wheel braking to transfer torque from one side to the other.

As it seems, the xDrive system is probably a better system. Not saying the torsen Quattro is bad though. Just a little outdated now. But it may still suffice for most uses (seeing how many replies on this thread indicates good experience with it). However, you must not dis-credit the xDrive system as I have yet to see a negative comment about BMW's xDrive system on forums and users.

Or looking at it from another perspective. xDrive scores arbitrary 95% and Quattro scores 90% in real world situations. Are both system good? Are both systems able to meet general needs? Yes. Its just in unfortunate certain situations where traction is not ideal at one wheel axis, the BMW WILL perform better and quicker than Quattro.

Last edited by tctic; 10-25-2010 at 09:22 PM..
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