blabla on AWD

[Peter & Rebecca Lines]

I'm a bit confused about the Haldex systems.  In my job (Automotive R&D) I 
have seen older Haldex brochures that show the thing setup as a rear diff. 
 The power comes in through the pinion, turns the ring gear, and then two 
separate Haldex clutches distribute the power to the halfshafts.  I have 
seen some newer brochures that show it as a single clutch that is mounted 
between the prop shaft and the pinion, then a more conventional open or 
limited slip diff. for the side to side bias.  In both setup's the front 
wheels are driven directly by the engine.  This latter setup can control 
the torque balance front to rear, but not side to side.  The first setup 
controls front/rear bias and left/right bias at the back, but is probably 
more expensive.  Anybody have a TT quattro? (stupid question).  Okay, 
anybody ever tear apart the rear diff on a TT quattro?  I'm curious which 
version Audi is using....  Don't bother asking anybody at the dealer....

-Peter Lines