[A4] Quattro System in '99 A4

Brandon Rogers brogers at terrix.com
Fri Feb 29 09:46:51 PST 2008

I'm not sure how good of a comparison this is because my A4 was a '98.5
1.8Tq - and I'm not sure what happened, if anything from then until '99
MY - just never know with Audi.

So anyway my car did not have ESP - just EDL which by my understanding
applies brakes to wheels slipping compared to others.  So the way I
understand it if they are all slipping - then no brakes applied.  With
Nokian WR snows the A4 was absolutely incredible in the snow - never any
power reducing from the ECU (no ESP) and very predictable.  Easy to get
throttle over steer and very easy to get straight when you wanted to.  I
would think if you have ESP you would also have a "Defeat" switch on the
dash (I do in my '01.5 S4 - and I always defeat it) but I'm not sure.
I'm not sure which motor/tranny combo you have but a manual tranny with
chipped 1.8T you get all the wheel spin you want.  Auto V6 I'd bet you
won't - we don't in our Passat V6 4Motion.


'84 ur quattro 20Vt
'01.5 S4
'98.5 A4 SOLD

-----Original Message-----
From: a4-bounces at audifans.com [mailto:a4-bounces at audifans.com] On Behalf
Of Derek Pulvino
Sent: Friday, February 29, 2008 10:03 AM
To: a4 list
Subject: [A4] Quattro System in '99 A4

Can somebody link me to a page that describes how the quattro system
works in this vintage of A4?  

As I understand it, this year of the car of course uses the torsen but
there is no locking differential at this point; any wheel slip that
makes it's way through the torsen is counteracted by braking at a wheel?
Were they also incorporating any kind of throttle control at this time
(i.e. if wheel slips, throttle is backed off) or did that not get
implemented until the drive-by-wire throttle was installed?

And what's the story with the ESP?  When was usage of that system begun?
Best I know, that's not included no my vehicle.

I'm all the more curious these days as I recently had my first snow
driving.  The car generally felt much more stable or maybe I'd say
"dumbed down."  It was very difficult to get any wheel-spin in the snow,
but tracking was good on and off the throttle and brakes.  Just trying
figure out what exactly is going on where the rubber meets the road.

Derek P

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