[s-cars] UrS teardown question

LL - NY larrycleung at gmail.com
Fri Oct 26 16:29:18 PDT 2007


Taka covered everything totally correctly. NER should be able to class you
they're one of the powerhouse regions. No way you should be running against
STX is mostly a WRX class. And they're right around 3300 lbs (ask me how I

And, yup, boosting is out, even in SP classes. For your Audi, really look at
roll, the improvement in transition rates will REALLY help you in the
slalom. You may
wish to start your roll reduction at the rear of the car, vs. the front, i.e.
you may want
to invest in swaybars as well as lowering your suspension, although you may
well be
as low as you can go and still get decent geometry. The thing that will
matter most
will be negative camber, go for as much as you can get, you really can't get
too much
on a street car. Believe it or not, tire wear won't be so bad with the
camber, however
the thing that will work quite well is toe out. Not the most stable, but it
will help get the
A4 to turn in. Unfortunately, the toe out will kill tires if driven on the

Finally, make an appointment to take another Evo school. If your sliding
that much,
you're overdriving the tires. THe BFG's although not the top tier of ST
tires, aren't
THAT bad, so it's more likely you're carrying too much speed into the turns,
the slaloms. What kills time in slaloms is roll (transition time) or
entering too quickly,
you spend too much time recovering and waiting for the car to roll from side
to side.
One of the reasons I'm going to be mounting up a an HSRB sized FRONT bar on
Saabaru for next season, my mere 1" FSB helps, but I need more. Running in
DS, and fighting the urge to go STX where I won't have to deal with ITR's
and 330's.



And sorry I haven't gotten pics yet on the Borbet T's. Been up to my
eyeballs in Alligators

On 10/26/07, Taka Mizutani <t44tqtro at gmail.com> wrote:
> 2007 Solo Rules, p. 80, section 14.10 (E)(1):
> 1. Reprogrammed ECU may be used in the standard housing.
> Traction control parameters may not be altered. Altered
> engine controllers may not alter boost levels in forced induction
> engines.
> You can't run a chip that increases boost on a turbo car.
> STX is a street tire category, tires have to have a treadwear of 140, you
> cannot run R compound tires.
> Evos are specifically excluded and run in STU actually, so that's not an
> issue.
> Other clubs run different rules, but if you want to run competitively, you
> have to prep the car to the rules, not the other way around, otherwise,
> you'll end up with an uncompetitive car. For example, my Miata is mostly
> STS2 compliant, but I have an aftermarket steering wheel, which is not
> allowed- if someone were to protest, I'd be DQed.
> For autocross, suspension tuning can be quite a bit unorthodox- for
> example,
> most cars benefit in stock class from a huge front bar- the increase in
> roll
> stiffness and improved camber control is a greater benefit than the
> theoretically huge increase in understeer that this mod would cause.
> Since you can use crash bolts in STX, you can adjust for max camber that
> way- sorry, I was thinking about stock class.
> You competition sounds like you're totally mismatched- run a SCCA autox
> against G Stock and STS/STX competitors and see how you do- it's hard to
> get
> a gauge on how you're driving if you don't have some sort of yardstick.
> Sorry for all the armchair QBing.
> Taka
> On 10/26/07, Lee Levitt <lee at wheelman.com> wrote:
> >
> >
> >
> >
> >
> > On Fri Oct 26 13:13:44 PDT 2007, Taka Mizutani
> > <t44tqtro at gmail.com> wrote:
> >
> > > Lee-
> > > In STX, you're down 57hp on the WRX and 100hp on the Evo- boost
> > > mods are not
> > > allowed.
> >
> > Hmm. My reading of the regs allows chips but not turbo exchanges.
> > And I tend to get lumped in with some pretty serious hardware as
> > we're all afterthoughts at both Porsche and BMW club events.
> >
> > At my first event in September, there were 3 cars, a purpose built
> > open wheel job, a built Mitsu with coilovers, big R compounds,
> > horsepower, and me!
> >
> > >
> > > You can't run R compound tires in STX, so I hope you didn't just
> > > make a very
> > > expensive mistake.
> >
> > Tires cost me $200 for the 4, had 1 day on them. Not too expensive
> > a mistake, if it was one.  I also thought that STX allows R
> > compound.
> >
> > >
> > > Best tires for STX would be Falken RT-615, Bridgestone RE-01R-
> > > the Hankook
> > > Z212 RS2, BFG KD and Kumho MX are further behind.
> >
> > I'm on the BFG tires now. Pretty good, but I need more grip (well,
> > actually, I need better form...)
> >
> > >
> > > I'd think you need at least H&R race coilovers and big sway bars
> > > to get that
> > > A4 in shape. With enough drop, you can get a fair bit of camber.
> > >
> >
> > I'm running Eibachs, Bilsteins and HSport bars. I also understand
> > that the VW/Audi suspension doesn't really like to be lowered too
> > much (see Dick Shine Racing website for discussion).
> >
> > > I don't know where you got those weight numbers- B5 A4s are a
> > > wash with WRXs
> > > and Evos- they weigh nearly the same, all about 3250-3300lbs.
> > >
> >
> > Talking out my nose on that one, I ASSumed that the other cars
> > were lighter...
> >
> >
> > > Evo school is generally regarded as a very good way to get a good
> > > start in
> > > autox w/o picking up a ton of bad habits. You might have to wait
> > > until next
> > > year to go to a school up in your area- season is pretty much
> > > over now,
> > > isn't it?
> >
> > Yes. There's a Test and Tune tomorrow at Devens, but it's going to
> > be raining most of the day and I've got too much to do...I did an
> > Evo school in my urS6 a few years ago, will do another one in the
> > spring.
> >
> > I also just signed up for the winter driving school, but that's a
> > different topic. And I'm not sure what car I'll drive...the C5 A6
> > or the B5 A4. I was not planning on putting winter tires on the
> > A4...so I guess it will be the A6. My winter wheels won't fit over
> > the Porsche brakes...
> >
> > Lee
> >
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