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-   -   6 Series X Drive Torque Vector (http://www.bimmerfest.com/forums/showthread.php?t=659049)

OBP 11-19-2012 07:41 AM

6 Series X Drive Torque Vector
 
Newbie here. I did use the search function for this forum but could not find the answer. I wonder whether the 6 series X drive cars have a torque vectoring capability in the rear diff ? I had heard that some BMW's have it and I know Audis with the sport differential have this capability. Would appreciate any info from the experienced BMW owners here.

tim330i 11-19-2012 07:46 AM

Welcome to Bimmerfest! Are you looking at a 6 series coupe, convertible or gran coupe?

http://www.youtube.com/watch?v=zEvLGIg2rCs

From BMWUSA.com -

Unlike other all-wheel drive systems, we've built xDrive, BMW's intelligent all-wheel drive system with rear-wheel bias for surefooted grip on slick or uneven roads, without sacrificing the feel of rear-wheel drive. It smartly sends power to the wheel or wheels with the surest footing-and it does so in milliseconds. That means under normal conditions, drive forces are spread out with a rear-wheel bias. But the moment the system senses excessive wheel slip, it subtly shifts torque to meet the changing conditions, offering maximum available traction and superior handling on all surfaces-despite the weather conditions.

OBP 11-19-2012 08:06 AM

Looking at the 650 Xdrive Gran Coupe - could not find anything that confirms if they have torque vectoring for the rear wheels.

The quote you put in the post suggests a front and back torque transfer as the conditions require. But I wonder whether there is left and right torque transfer during cornering where the outside rear wheel is rotated faster than the inside rear wheel - that is what the Audi Sport Diff does as well as Acura's SH AWD and I know it was being talked about for some BMW's but I cannot seem to confirm that it is in the 650 X drive GC ....

tim330i 11-19-2012 08:17 AM

I'm 99% sure xDrive is open diffs but the system uses the brake on the slipping wheel to transfer torque to the other wheel. I would guess that is how the Acura system works as well, Audi has a much more complex diff system.

Tim

OBP 11-19-2012 10:19 AM

Hey Tim thanks. I found what I was looking for - it is called Dynamic Performance Control in BMW and it is on the X6 5.0. It transfers power laterally between the two rear wheels when cornering and is highlighted as a feature on the BMWUSA website for the X6. I guess it is not available on the 650 X drive GC cos I did not see this feature highlighted at all on the 650 X Drive GC pages of the website ?

tim330i 11-19-2012 11:20 AM

That is interesting, I had not heard of that before. As I mentioned I'm fairly sure most xDrive vehicles have open differentials. I found this on BMW.com -

Quote:

xDrive is regulated by Dynamic Stability Control (DSC) and uses information from the latter system's sensors to monitor road conditions. In addition, brake force courtesy of DSC is used when there is traction difference between the two sides of the vehicle and wheel spin is likely.
Tim


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