Audi in London

[Ed Kellock]

Up to 1988, all Quattros had manual locking diffs, center and rear.

In 89, the Torsen center was introduced.  It functions autonomously with no
driver input.  The rear diff paired with it did not change but the control
of the rear diff did.  It was changed to an electronic switch that would be
defeated when speed reached 20mph.

At some point during the mid 90's when ESP came out, all driver input to
control of the open rear diff was removed and slip was controlled by brakes.


So:
84 4kq & 87 5ktqa, fully manually driver controlled
90 CQ & 91 200q, Torsen center with electronic switch for partial driver
control of rear diff

I think the 01 S4 has Torsen center with ESP controlled open rear.

The more front-heavy cars would tend to push.  That's the CQ, the 91's &
then the 87 in order of what I guess is most front heavy to least.  The ones
with turbo power would definitely give you better ability to kick out the
tail. 

I think the predominant difference amongst all these really boils down to
weight distribution when talking about intial response to turn in.  After
that, behavior is affected by diff orientation and control and then by
available power to input.

Ed


> -----Original Message-----
> From: quattro-bounces at audifans.com 
> [mailto:quattro-bounces at audifans.com] On Behalf Of John Cassidy
> Sent: Tuesday, February 03, 2009 12:43 PM
> To: quattro at audifans.com
> Subject: RE: Audi in London
> 
> 
> OK, so which is which?  I've had 7 quattros and don't know 
> squat about center diffs, but can attest to the following 
> after driving them all in
> Montana winters:        
> 
> '84 4kq  - best balanced handling overall, especially after 
> modified the selector to lock rear diff first
> 
> '90 CQ (x2) - worst handling, pushed like a fat lady at the 
> candy store
> 
> '91 200q (x2) - OK, a lot of initial push but can be 
> manhandled into oversteer
> 
> '87 5ktqa - better than the 200, but still pushed initially
> 
> '01 S4a - pretty darn good, especially with good snows and the ESP off
> 
>  
> 
> JC
> 
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