xDrive

[DinanX5]

Hey everyone! Long time, no post....

So I was reading about the e70 X5 in last month's Roundel, and it described the functioning of the xDrive system exactly the same as it is in the face-lifted e53, and the X3.
I thought I'd read somewhere (on this forum, probably) that the e70 was going to get xDrive "II", where the electronic diffy could vary torque not just between the front and rear axles, but side to side as well (as opposed to calling upon ABS to limit wheel spin within a given Axle) I guess this new system didn't make it into the e70 (?)

Also, the article briefly mentioned the role DSC and DTC play in the functionality of xDrive... and how it's possible to disengage DSC (which we all know is done by pressing the DSC button on the center console) - which leaves xDrive operating with only the DTC. But apparently you can also disengage the DTC and let xDrive manage traction on its own.
I seem to remember reading (also, probably on this forum) that this can be done in the e53 too... something about holding down the button for 3 seconds maybe (?) Anybody know the details?

[xx3]

xDrive II is stated for release in the middle of the E70's lifecycle. Just as the E53 went from a DSC based 4 wheel drive system to xDrive in the middle of its lifecycle.

I'd look for the new xDrive to debut at the time of the new next-gen X3's unveiling. BMW will bring the X5's spec up to date with X3 spec...

[DinanX5]

OK, so xDrive II will be introduced the same way the current xDrive was - that makes sense...

Any ideas about the DSC/DTC question?

[apetrov1x5]

just press the button and hold it for more than 10 sec

[Mitch P.]

Originally Posted by apetrov1x5

just press the button and hold it for more than 10 sec

Will there be another indicator showing when both have been disabled?

Also, I'm assuming that X-drive is more effective when you leave the DSC button engaged?

I'm new to the X-drive camp arriving from Quattro and giving it a little boot with the throttle would ensure the EDL's would get engaged to get you out of a really tight spot. From what I'm reading about X-drive, the torque has to rely on traction control to brake the spinning wheel and transfer torque to the other? Not as effective as a locking differential, but works nontheless. If one could point me to a technical description of X-drive I'd appreciate that as well.

[xnsf]

try this http://www.janixworld.com/x5/misc/X5%20xdrive.pdf

courtesy of the homepage

[Mitch P.]

Originally Posted by xnsf

try this http://www.janixworld.com/x5/misc/X5%20xdrive.pdf

courtesy of the homepage

thanks, newbie alert here!!

[xnsf]

Originally Posted by Mitch P.

thanks, newbie alert here!!

i'm a newbie too

[Mitch P.]

That was a good read where, but I'm still left with a few questions. I see how the torque can be shifted fore and aft by the center diff, as well as from side to side by engaging a particular wheel's brakes.

So what happens if you push the DSC button once? I assume that this only disables stability control which really reacts to excessive yaw rates (ie oversteer or understeer)? I think I have that right?

What happens if you push and hold DSC down for >10secs? That disables DSC AND traction control? Hence that essentially disables sensors from distributing torque from side to side AND front to rear? That confuses me a bit thinking that it may disable X-drive altogether and go to a 100% rear drive car? If that's the case, I can see some rear-wheel drive enduced oversteer in my future, but I'm guessing this is not the case. I need to go out and experiment a bit

[xnsf]

oooo....i'm interested to know that too...