Originally Posted by scott27

We can say Dynamic xDrive (= DxD) is Ver. 3.0 xDrive - it has been already tested in E70 prototypes so most of us, and most of automotive press thought DxD would be offered in E70 from the begining. But these were initial tests only.The system is still being tested X6 prototypes (right now under E70 mules). Development is still not over yet - some tweaks should still be done before new system will be offered in production cars. X6 (coming in 2008) will debut the new system.

Dynamic xDrive is similar to Honda / Acura's SH-AWD: it is able to distribute torque not only front vs rear, but also left vs right. With Ver. 2.0. xDrive DSC, ABS, etc systems can brake seperate wheel so in the most extreme limits e.g. rear right wheel can get 50% of all torque available to the wheels (100% torque to rear axle, left wheel totally braked). With Dynamic xDrive in the same case 100% torque will be distributed to the specific wheel, so no perfomance will be lost (like today). This will be the most important new feature of Ver 3.0 xDrive, others will include even better collaboration of xDrive & other systems (DSC., ABS, gearbox, suspension, engine etc), FlexRay data transfer protocol also for xDrive, etc.

After debuted in X6 Dynamic xDrive will then be creep in other new BMW vehicles (V5), current models will get it with facelift (X5, 3er), or with new generation (7er, 5er, X3).