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why not the LS2LS7? @ Feb 7th 2007 4:34PM
It is impossible for the VW/Audi Haldex system to have a rear torque bias.
The system is a FWD system, with a power take off heading to the rear of the car. Then there is a Haldex clutch and a driveshaft to the rear diff and out to the wheels.
In normal operation, the Haldex clutch is disengaged and no power flows to the rear, it is a FWD car. When the front wheels slip, the Haldex is engaged, and the rear wheels receive some of the power going to the front wheels. However, even at full engage, the rear wheels are driven no faster than the front ones. The front wheels cannot be disengaged at all.
Since the front wheels are driven at least as fast as the rears at all times, that means it's difficult for the vehicle to behave anything like a RWD car. If the fronts slip, the rears can do more driving, and in turns there the fronts take a longer path, the rears can do some driving.
All in all, given how rarely AWD is actually needed on a car, this system is a good one. It is light and has low rotating mass.
But it is also decidedly FWD biased at all times.
Unless VW wants to talk about a new system like Honda's SH-AWD, which uses gearing in the clutch to drive the rears faster than the fronts (when engaged). To be honest, this system is pretty much unnecessarily complex, amongst other problems.
250HP, DSG and 0-60 in 6.4 secs? How heavy is this car? A 250HP A6 2.7T did 0-60 in 6.0 seconds with a manual and 6.7 with a slushbox. And it weighs 4,000 lbs.