We all know AWD doesn't help on ice; so let's not begin to bantering this.
Last night I went out to a straight road across from the apartment to test the AWD; I was wanting to see how/what happens when the rear end disengages from too much torque. Now I'm questioning this because technically on ice, you're spinning--so is torque really being put down, or does the car calculate torque and shut down;;how does that truly work? That is the question I pondered.
From a stop, I hit it -- I spun all 4 tyres for quite some time; I don't recommend doing this because I was sliding all over the damn place. I didn't sense the rear end disengage but for all I know it may have. I had the car in track mode with everything turned off.
I do know the car does run FWD period; at back of that road is a huge parking lot that was iced over a bit so I did a 180 degree turn and when I took off it was more like a FWD slide (if you've driven FWD you know it doesn't really whip around due to zero power in rear). As soon as front started spinning I felt the rearend kick in and instantly my arse was flung around fast like a RWD.
Interesting experiment I must say; got a little hairy in a few places as doing things on ice is pretty much a "hope to the stars you don't slide into something". LOL
We did get about 7"-8" of snow on Friday and we are slated for more on Sunday and Monday. The SHO is definitely handling very nicely with the DWS tyres on it and the AWD system--it's just different when you come out of a turn and you start spinning and the rear end kicks in and somewhat jerks the butt to a side.