This shows how the EDS diffbrake system makes the car move out of this diagonal wheel spin. with only open differentials, one front and one rear wheel would spin, and even if the spinning front wheel got contact with the ground, so that both front wheels had traction, the car would NOT move without EDS, because the torsen center diff cannot transfer any torque if one of the axles loses traction completly, as if one rear wheel is off the ground like in this video, then that would be the only wheel that would spin, all others would stand still. So the EDS uses the brake to brake the spinning rear wheel so the other side that has all the weight also gets some torque and add a overall load to the rear axle, making the torsen transfer equal torque divided by the built-in Torque Bias Ratio (TBR) witch i guess is 1:3 on this car, so the front wheels gets the rear wheel torque divided by 3, witch makes the car move.
Trying to break an Audi allroad in half
So I go away for what I thought was a relaxing Easter weekend on a farm in
the Cederberg with some friends. Turns out the farmer is a 4x4 buff and has
laid out a challenging technical course... He was very keen to see what my
allroad could do - and so was I!
Unfortunately I was too busy driving and trying to keep up with him to get
much footage, but for this obstacle I asked the farmer's neighbour to video
me going into and out of a ditch to test suspension and traction control...
I struggled on some of the slow steep sandy sections (wrong tyres!) but was
pleased a couple of days later when he had some visitors from the Cape Town
Landrover Club - and they couldn't do those sections either!
Well I did read somewhere that the Audi allroad is the only all-wheel drive
"softroader" that has successfully completed the Landrover proving grounds
true about quattro
translation of this test is here,
Audi A6 Quattro in sugar sand snow FAIL
I'm sure the Allroad would have no problem with the extra 4" of ground
clearance and 10% wider(225) tires. While my 205s could not "float" the
4000lbs in 4.2" of sugar sand, The Allroads 225s would easily float it in
8.2" of the white stuff. It was not an issue of traction or power. Without
the ground clearance, sinking in only 4" took the weight off the tires and
rested it on the sand. The Quattro system is great, I just need a 2" lift
kit and all terrain tires.