Rear Stabilizer Bar

[Kaklikian, Gary]

I assume a 5000 would react similarly to an UrQ or other Gen 1 Quattro. On
my 4000, which has the stock front bar and a 21mm rear bar with endlinks
welded to the uprights and a reinforced subframe , the inside rear wheel is
seriously unloaded under hard cornering.  This makes the rear a bit twitchy
in normal driving and is not optimal for fast corner exits on the track, as
evidenced by plumes of smoke.  Leaving  the center diff locked cures this
problem  (as would instantaneously locking the rear), and the stiff rear end
prevents the understeer that would otherwise  occur with the locked center.
The result is sharp turn-in, the ability to pivot the car with trailbraking,
and full power corner exits.

Of course, the front/rear spring rates, camber/toe, etc also come into play.
I'm running only 1.2 degrees negative camber and 0 toe in the front, and the
front tires are working better (contact patch,temps) than the previous setup
of 1.6 degress negative and .25" toe-out before the rear end was stiffened.
And, increasing the front roll stiffness does help  maximize the contract
patch -- I'm using a front upper strut brace, polyurethane front
swaybar-to-subframe mounting bushings, and delrin lower control arm
bushings.  


Gary Kaklikian
86 4ktq
92 S4

> ----------
> From: 	Eric Fletcher S.O.C.[SMTP:Steadi at swbell.net]
> Sent: 	Thursday, November 16, 2000 8:19 AM
> To: 	Coleman, David; 'quattro at audifans.com'
> Cc: 	'mlped at uswest.net'
> Subject: 	Re: Rear Stabilizer Bar
> 
> > Actually, understeer is corrected at the rear axle, especially if it's a
> > front-driver.  I race an ITC Scirocco, and am running one big bar in the
> > rear, and NO bar in the front.  The car used to push like mad, until, at
> the
> > advice of about the entire field, I removed the front sway bar.  Some
> > fwd'ers are using TWO rear bars.  Also, no top strut tie bar is used,
> > although that's due to rules constraints.
> 
> You might want to run a roll center analysis on the Type 44 or you can
> read
> the one that I wrote that is in the archives.
> 
> The problem boils down to this.  The rear suspension is TOO good on the
> Type
> 44's.  There is SO much weight transfer going on in the car that the rear
> inside wheel is already unloaded to the point that its only carrying about
> 50lbs in a full load turn.
> 
> 
> Eric Fletcher
> '00 S4tt
> '87 5KCSTQ with way too many mods (Gone but not Forgotten)
>