torque bias

[Dan Cordon]

> exactly the opposite in fact.
> 
> normal *open* diff is a 50:50 split.  all the time.  lock
> the diff and as doug has said then torque will go to to
> whichever wheel can support it.  up to 100%.
> 
> there are ways of altering the static torque split of an
> *open* differential, but they were not used in any
> production audi.
> 
> dave
> '01 s8

I agree with Dave. The open diff in the audis were a 50:50 torque split 
(as is virtually any traditional open diff). When encountering a 
slipping condition, it's still a 50:50 torque split.....it's just 
splitting the lowest torque value.

With the diff locked, it can be considered a *floating* torque split. 
With equal traction (and car going straight) it's still a 50:50 split, 
but can change anywhere from a 0:100 to 100:0 torque split. This is why 
I can drive my 87 5kcstq around in fwd while the center driveshaft is out.

The torsen diff (not wanting to start anything here) is also a floating 
split that (don't quote me though) has a range of ~25:75 to 75:25. But 
unlike the locked diff, it can deal with speed differences.

As for the TT, II read somewhere a while ago that it was nominally a 
80:20 (front:rear) torque split. That gives it some extra traction in 
slippery conditions, but it virtually drives like a FWD car.

-- 
Dan Cordon - slightly jealous of Dave's S8
Mechanical Engineer - Engine Research Facility
University of Idaho