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TORSEN's in racing?

In message <01ICWVD4XAZI988ROK@delphi.com> audidudi@delphi.com (Jeffrey J. Goggin) writes:

> >What did the A4Q's in the DTM and the BTCC use?  
> According to Racecar Engineering (Vol. 6, No. 2) they used either Torsen or
> viscous center diffs ... according to Complete Car (June, 1996), they used a
> Torsen.  I haven't seen anything else about these cars published.

According to the car I saw being stripped at Audi Sport (UK) they have no 
centre differentials at all.
> BTW, the Ur-Q rally cars often didn't use a center diff ... or they used an
> open diff that could be locked as appropriate, such as when powering out of
> a corner. 

Very true.  The Sports in competition often didn't have one, either.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club