[s-cars] S2 Tyre Wear / Tracking Specs.

[Kirby Smith]

I thought the S2 and 90q used the same suspension, and thereby the same
geometry.  But only having 2 90qs and no S2, even ersatz, I'm no
authority.

Clearly a wide, flat, stiff tire will roll on the inside edge with
negative camber, unless the tire is running toe-out, a probably
undesirable condition.  Ideally, I think, camber should be set so the
tire is flat when at the point of incipient drift.  That might be too
much camber for tolerable wear.

You might want to do this experiment.  Chalk your front tires, and do
one of your extravagent turns.  Note where the chalk is scuffed off.
Reduce camber and try again.  You may find that street tires run at high
pressure will drift before scuffing very high, and that you can reduce
camber and still have good performance.  Or you could reduce pressure a
bit and see if it helps.

kirby

Ian Bradshaw wrote:
>
> Hi all,
>
> The front tyres of my Coupé QT S2 are wearing much quicker than the rears,
> particularly on the inside shoulders. Maybe an increased wear rate is to be
> expected with the front doing the steering and being heavier. What I have
> noticed is that the inside 50% of the tyre tread on both fronts is getting
> much hotter than the outside 50%.
>
> Compared to my '88 A80Q, the front wheels seem to have more camber. So I
> took it to have the wheels aligned and they said the camber is within
> manufacturers specs. (albeit at the high end) and that with wide tyres
> (225s) and a heavy car this wear is to be expected!
>
> I have a couple of questions:
>
> 1) Will reducing the camber to the middle of the specified range (or even
> minimum) help? N.B. I have recently installed polyurethane bushes (front
> only), so the wheel camber should be held more firmly in position. I don't
> race or do track days, but do hammer it on the road, including smoking
> brakes & the occasional sideways moment.
>
> 2) Does anyone know what the Audi specs are for camber and toe on the S2
> Coupé, or where I can find this information? N.B. the previous time I had
> the wheel alignment checked, on a different machine, the 'Factory Specs.'
> were different.
>
> Thanks,
>
> Ian
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list