Quattro generations (was: Miata Torsen)

[Ti Kan]

quk at isham-research.freeserve.co.uk writes:
> [ quattro I ]
> >    This system is not ABS-friendly because locking the diffs effectively
> >    eliminates any speed difference between wheels, disabling ABS wheel
> >    speed sensor function.  On the 5K/100/200 models that has ABS, it is
> >    automatically disabled when a diff lock is activated.
> >    Used on 1982-85 UrQ, 84-87 4Kq, 86-88 5Kq/100q/200q
> 
> I don't see that it's that ABS-unfriendly.  The rear wheels share an
> output channel in that system and are released/braked as a pair anyway,
> diff locked or not.  Besides, only a fraction of the braking effort
> comes from the rear.

But on most of these cars the diff lock switch lets you lock the center
diff *first* and then the rear.  When the center diff is locked you
defeat the ABS in a big way.  At any rate, the system disables ABS
when you lock the diff, if that doesn't tell you something.

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
96 A4 2.8 quattro (sold but not forgotten)
-- 
    ///  Ti Kan                Vorsprung durch Technik
   ///   AMB Research Laboratories, Sunnyvale, CA. USA
  ///    ti at amb.org
 //////  http://www.ibiblio.org/tkan/
///