changing rear bias to front for winter
 

Hey guys/gals, winter driving sucks for the most part when during the summer we take such good care of our kick ass rides but in hopes of being able to maintain control in icy conditions, is there any kind of software out there to direct the rear bias towards the front more kind of like the Subaru WRX STI has a selector? I thought I'd just throw that out there in case someone knows of something available. For the summer I'd love to have more power going to my rear fattys anyways.

I believe the pre-xDrive vehicles have a transfer case that directs the power 38F/62R full time. Nothing at all can be done to alter this software-wise, this is purely mechanical.

I think (?) the xDrive vehicles have a clutch pack in the transfer case that will allow power to be directed front to rear. I don't know if this system could handle throwing 100% power to the front, or if there is anybody with a program able to attempt such a feat. Either way, your X5 will still have open differentials and won't be as sure-footed in the snow as a Subaru.

WOW!! I love this forum for the collective information of the members. Now all i have to do is understand more fully the internals of the transfer case and how, if it's possible to change parts, achieve the results I'm after. If anyone has access to any guru mechanics to pass the question by, that would be great. I will do the same.

Your 4.6 is pre x-drive, so it has the fixed torque split front-rear, as mentioned above. That is a function of the design of the New Process/New Venture 125 transfer case. There is no ability to modify it, and it is an open differential, so there is not much that could even be contemplated.

The x-drive models from 2004 onwards have clutch plates, and variable torque split based on wheel speed sensors (for front-rear). Side to side torque split is handled by braking individual wheels using the traction control system.

The Subaru is essentially a front wheel drive vehicle. The AWD component is added on to the design, but the vehicle starts from having FWD. That is why you can select more of a FWD bias.

The best thing you can do for control in icy conditions is select the correct ice radials, and then let the X5 dynamic stability control (DSC) system function as designed. Practicing with it on closed roads or parking lots will show you how to get the most out of it.

Fire away if you have specific questions.

Again, another awesome amount of information. Thanks a ton. With the right information, it's really helps me pick my projects.