Re: Torsen tech

[Orin Eman <orin@wolfenet.com>]

> given the torsen is not at the bias ratio, it is not allowing output shaft
> speed differences.  to clear up your misunderstanding, the paper says when
> measuring the dynamics of a 80q in a turn that "0.2% of forced slip occurs
> between the 2 axles which reduces the slip under traction at the front
> wheels and increases the slip at the rear wheels.  this results in tractive
> forces being redistributed towards the rear wheels".

What was the speed of the car and radius of the turn?

> scott, this means that the *tyres* compensate for this slip *not* the axles
> speeds.  you misunderstand this.  the torsen at this point (before the bias
> ratio) has locked the output shaft speeds.  it is operating as a locked
> differential would.  hence any "claim" you make for the torsen at this
> point, you have to also make for the locker.

But the locker can send 100% to the rear to 'force' this slip whereas
torsen can only send 75%.

> btw, the torsen will not allow any axle to "spin up" until it is at the bias
> ratio.  this is a function of torque inputs or tractive forces at the tyres
> or both.

Dave, we are considering the case where we _are_ at 75% rear and the
torsen _is_ at the bias ratio and _is_ allowing axle speed differences.
15m radius turn as I recall.  What happens in _this_ case?
Other cases (four wheel drifts, larger radius such that the torsen
isn't at the bias ratio) seem benign.

Orin.