RE: real quattro

["Dave Eaton" <Dave.Eaton@clear.net.nz>]

in theroy yes, you could do this, but in the vw/audi implementation (front,
tranverse), this would not be possible as the primary (front) driven wheels,
are separate from the haldex which is mounted in the rear.  you would have
to re-engineer that.

in a longitudional iplementation, you could do it quite easily.  haldex per
half-shaft anyone.  there were strong rumours that audi was going to do
something like this with the s6.  perhaps the rs6?

remember that the haldex uses slip to generate the hydralic pressure
required to work the clutch.  the length of time the clutch is activated
(i.e. torque is sent rearwards) is up to the computer which controls the
hydralic pressure through a bleed valve.

you should remember that the haldex in this implementation is very similar
to a vc, without slip there is no torque transfer...

hth,
dave
'95 rs2
'90 ur-q
'88 mb 2.3-16


-----Original Message-----
From: Levis-Fithian, Jeff E [mailto:LevisJE@LOUISVILLE.STORTEK.COM]
Sent: Friday, 10 September 1999 03:28
To: 'Dave.Eaton@clear.net.nz'; 'Quattro-List'
Subject: RE: real quattro


So if the Haldex system is computer controlled, does that mean with the
right computer that you could control the front/rear torque split?  It sure
would be fun to have a 225hp TT that is primarily rear wheel drive, and then
send some torque to the front wheels when necessary, a la Porsche, Lambo,
etc...  In effect, the opposite of what it is now.
-Jeff
95 A6Q

------------------------------

Date: Thu, 9 Sep 1999 11:13:40 +1200
From: "Dave Eaton" <Dave.Eaton@clear.net.nz>
Subject: RE: real quattro

yes this is correct - the haldex is basically a "hang-on clutch".

but in defence of the unit, there are a number of very ruputable
manufacturers who use very similar technology.  the big advantage of the
haldex is that it is computer controlled which means that the circumstances
governing activation, duration of engagement etc are decided by computer,
rather than my simple mechanics as in a torsen or a vc.

hth,
dave
'95 rs2
'90 ur-q
'88 mb 2.3-16