Quote:
Originally Posted by hulkrogan
This is not true at all. Now it's pretty muddy because even Quattro varies completely from vehicle to vehicle, but up until a few years ago 4Motion was an electronic HALDEX centre diff and Quattro was a mechanical Torsen setup.
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Im not talking about a few years ago, I am talking present day.....yes, there are different ways to split the torque in the centre section, but both systems are used in both platforms (audi/VW)
I quote "
The Volkswagen 4MOTION all-wheel drive system is a key technology in sporty, but above all safe driving. At the core of this method of power transmission to all four wheels is the Haldex coupling. The Haldex coupling is mounted in front of the rear axle differential and actually becomes part of the rear differential case. Yet, it functions as a center differential. Its hydraulic and electronic systems automatically detect wheel slippage (for example, due to road conditions or high power requirements) and distribute the tractive force to the two axles accordingly.
And because it‘s so fast in slip detection, in the absence of wheel slippage, this system defaults to front-wheel drive for better fuel economy and less wear on the drive train. When driving the Golf R32, you hardly notice the work of the 4MOTION Haldex system. You only feel the absence of under- and oversteering. Even on wet roads or when accelerating quickly out of tight curves, there is no noticeable wheel slip, and extreme spurts do not cause the steering to jerk. In addition you do not feel any wind-up in the drive train when maneuvering into tight parking spaces.
The development of the Haldex differential is a giant step forward in modern all-wheel-drive technology. It is controlled based on the inputs the Haldex control module receives from the vehicle. Slip is no longer the only decisive factor in the distribution of drive forces; the car‘s dynamic state is also a factor. The processor accesses the ABS wheel speed sensors and the engine control module for data that provides the processor with all the information it needs. This information includes road speed, cornering, and coasting or traction mode — all of which allow the Haldex system to respond optimally to any driving situation.
The Haldex system is also used on the European Golf and Bora 4MOTION, Audi A3 and TT Quattro, and other vehicles."
I was incorrect about the toureg, it has more of a traditional transfer case type set up like in a true 4X4....