TT Epicyclic?

[CM1022@aol.com]

Sorry to Dave, I didn't mean to drag on like that but I am new to the list and
needed to explain.  I know you already know this stuff, old boy!

The Epicyclic diff is also called a planetary diff, and it is basically an
automatic transmission used as a diff.  It has planet, sun, and ring gears
with many smaller clutches that sit in oil- i.e. a viscousity coupling.  Dave
is right when he points out the similarity.  It is slip activated, and Porsche
is creditied with the invention of it in the late eighties for the Carrera 4
to my knowledge (after the control clutch center diffless 959).  Does the TT
have this?  Is this what the haldex is?

I know little about "active diffs" used in modern group A.  I would appreciate
any info, I would love to learn.  Some of the features of the Porsche
Epicyclic diff are super fast milli second reaction, and a tested torque
transfer of 85% on sheet ice.  The Carrera 2 could only transmit
65%............

I regarded the WSS and computer logic control combined with a
lateral/longitundial G sensor in the epicyclic Porsches as being "active".
But I guess I was wrong.

Chris Morlock

86 951
83 928S
81 928
81 931
70 BMW 2800 CS
and an HD