Re: Torsen diff questions...

["Graydon D. Stuckey" <graydon@apollo.gmi.edu>]

On Thu, 15 Feb 1996 AUDIDUDI@delphi.com wrote:

> Can anyone point me in the direction of a reference book/article that will
> explain the math behind the Torsen-style diff used on my 200tq?  I've been

I'll check my files.  I have some info from Gleason.  Your best bet would 
be to come to Detroit next week for the SAE show.  Gleason always has a 
nice display.

> scheming a bit and need to know how the torque-distribution ratios are set
> (you know, the front-to-rear torque distribution limits) but haven't found

	I am pretty sure that the torque split is 50/50.  The torque BIAS
for both sides can be set by changing the friction on the side
bearings(like tightening up the clutch packs on a regular LSD).  You can
replace the needle bearings with a bronze bushing (with little oiling
slots) to increase the torque bias.  You can increase it more by making
the bushing out of steel, with no oil slots.
	Now, to adjust the torque split fr/rr, you could do the
aforementioned mods to one side only.  This is just supposition, I haven't
done this or been told that it would work. 

> for SAE papers, among other things, but came up empty handed ... there are
> lots of articles about the topic in general but nothing very detailed.

You can't figure these things out with SAE papers anyway - you need to 
sit one on your desk for about three weeks, and let it soak in very 
gradually. :-)  Also helps to take one apart.  Just make sure you have 
the instructions to reassemble it - there is a prescribed order.

Later,								
Graydon D. Stuckey								
graydon@apollo.gmi.edu								
Flint, Michigan   USA
'86 Audi 5000 CS Turbo Quattro, GDS Racing Stage II				
'85 Mazda RX7 GS 12A-leaning-towards-a-13B-soon