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volvo 850 awd diagonal test

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Published on Aug 2, 2012

A test of my fathers Volvo 850 turbo awd -97
At 0:07 you can see the automatic rear differential lock engage, that's why the rear wheel dosn't spin even though it's off the ground.

This 4wd system has continious drive on front axle, and the rear axle is connected through a viscous coupling to the transmission, and the rear differential has an automatic locking feature (Eaton G80) so as long as the front wheels don't spin, the rear wheels won't spin either, but when the front wheels spin, torque is being sent to the rear wheels, the viscous coupling has NO delay in engagement, in fact, it's "engaged" att all times, but it can only transfer up to 50-60Nm to the rear axle before it starts to slip, that's often enough to get the car moving a bit so the front wheels gets traction again, so this system performs well in rough terrain and snow, but it's not the best system for drifting, as the front wheels always spins at minimum the speed of the rear wheels.

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