[Spridgets] Diff action

[Daniel1312 at aol.com]

Torsen is brand name and Gleason (?) have in recent years protected their 
brand name product.

Torsen means Torque Sensing and is a gear type diff and was first used, to my 
knowledge, in the original Audi Quatro (I guess it used 3?).  A torsen diff 
gradually locks up the diff action to a preset 80 or 95% or whatever.  A Quaife 
diff is a torsen but they've had to call it automatic torque biasing.  The 
Phantom Grip has a torsen effect but is a device to modify the behaviour of a 
diff.

An LSD or plate type diff doesn't sense torque but I think speed.  What 
happens is that it doesn't lock across the diff but switches power to one wheel - 
the one with grip.  This is a Trannex, Gripper or the ZF like in some BMWs.

I always think of viscous as a viscous coupling rather than a diff but I 
suppose they can be made as a diff.  Ferguson have the patent on them as far as I 
know.  I'm less certain how a viscous works but expect a similar response to a 
Torsen.

The driven characteristics between a Torsen and an LSD is markedly different.

Regards

Daniel1312

In a message dated 21/06/07 19:07:36 GMT Daylight Time, derf247 at gmail.com 
writes:

> LSD