[s-cars] UrS teardown question

[Taka Mizutani]

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:
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> 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
>