RE: Torsen tech

["Dave Eaton" <Dave.Eaton@clear.net.nz>]

sorry orin, but the confusion here is that scott is explicitly discussing
the audi sae 885140 "case" where the car is *not* at the bias ratio (it is
proportioning torque 38/62%).  scott has said that the bite can occur this
point, hence my post on thursday for clarification (see below)...

dave
'95 rs2
'90 ur-q
'88 mb 2.3-16

-----Original Message-----
From: Orin Eman [mailto:orin@WOLFENET.com]
Sent: Wednesday, 3 November 1999 15:37
To: Dave.Eaton@clear.net.nz
Cc: quattro@audifans.com
Subject: Re: Torsen tech

> 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.

-----Exerpted Message-----
Date: Thursday, 28 Oct 1999 14:45:15 EDT
From: Dave.Eaton@clear.net.nz
Subject: RE: Torsen 201/103 and some 101

ummmmm, then if you're not talking about the torsen operating at the bias
ratio, but before then, when the diff is locked, i'm very keen to understand
how it differs at this point from the fixed centre diff?

----------------
Date: Wed, 27 Oct 1999 08:42:15 EDT
From: QSHIPQ@aol.com
Subject: RE:  Torsen 201/103 and some 101

Dave E writes
>if the torsen is at the bias ratio power-on in a turn, then there is *more*
>tractive potential at rear of the vehicle than is being used.  why?
because
>by definition the bias ratio means that the the torsen has *stopped*
>allocating torque rearwards.  if it hadn't stopped shifting torque, even
>more would be going to the rear.

It's not at the bias ratio power on in a turn.  Remember it "... is
presupposed that the torque split limits of the differential are not
exceeded, so that it is not called up on to compensate for different wheel
speeds"  Your above is not correct as stated, more importantly, not
relevent.
 For ease of discussion, can't we presuppose (just like your 885140), that
torque allocation doesn't include wheel speed differences.  Remember, a
torsen allocates torque before wheel speed differences occur.