Street Tire Class 2013

Daniel Camacho · **Posted:** Fri Mar 08, 2013 12:39 pm

michaelsmiller wrote:

I get 22 MPG in aZ06 and 23 to24 in a Mazdaspeed 3 around town. Now I don't feel guilty about having high HP cars. :thumbsup:

My 240SX gets about 28mpg overall...
Too bad it's not the least bit competitive in "Street Touring, Civic" :roll:

Chuck Branscomb · **Posted:** Fri Apr 05, 2013 1:56 pm

RodneyWright wrote:

Chuck Branscomb wrote:

We put on the the SSR 8.5" wheel, 44mm offset, in the rear with the old BFG R1 245/40 on it, and it rubbed the fender lip badly (gauged the tire sidewall), but the R1 is a very wide for its size tire, and it carries its section width all the way to the tread face unlike most tires). So that's why we want to test fit the Rival -- not sure if the Rival is going to be "section-width-wide-all-the-way-to-tread-face" like the R1. Of course in STX she can have the fender lips rolled in the back, so I suppose she'll do that if needed.

I think her car is sitting about 1 1/4" lower up front and maybe 3/4" lower in the rear from stock. The problem with the 245/40 also is that it is larger in diameter, so it makes clearances tighter. I know with the stock suspension it rubbed the inside of the fender liner on the front side (tire tread face rubbed liner with wheel turned) for example.

As to pushing, from what I hear from a guy in the Midwest (very, very good autoxer), the E90 M3 is a much improved front suspension design from the E46 (so camber wear is nowhere near as bad), and the car is tail happy at will in many cases. The larger front bar (sitting in garage already) is very helpful.

Speaking of Jackie's car, IF she ever decides to sell, I'm still very interested in buying it.

Here ya go Rodney...no sunroof ZHP, blue, Alcantara interior:

http://www.e46fanatics.com/forum/showthread.php?t=974124

Jeremy Ellison · **Joined:** Fri May 13, 2011 5:01 pm **Posts:** 186

Chuck Branscomb wrote:

Here ya go Rodney...no sunroof ZHP, blue, Alcantara interior:

http://www.e46fanatics.com/forum/showthread.php?t=974124

[chant]Do it! Do it! Do it![chant]

... It's probably already sold.

RodneyWright · **Posted:** Mon Apr 08, 2013 7:53 am

Chuck Branscomb wrote:

[Here ya go Rodney...no sunroof ZHP, blue, Alcantara interior:

http://www.e46fanatics.com/forum/showthread.php?t=974124

Oh man, don't do that to me now, just paid off the 3. Considering that car is located in Michigan, I think I'll pass on that one even though it does look good in the pics.

Bill Aycock · **Joined:** Wed Sep 26, 2012 1:55 pm **Posts:** 117

Ok, so I have a TIR/pax/classing question.

I have talked to a couple of people over the course of this season who started the year out in TIR, but then did an upgrade to their cars, which pushed them into an ST class. I have also noticed some people running in TIR class that are in the Street Prepared category, and it was my understanding that a Street Prepared car is more heavily modified car than an ST car.

I was under the impression that any class car could run in TIR. Are ST cars disqualified from running in TIR, or is there just more of a pax incentive to run in ST?

Zach Hill · **Posted:** Tue Jun 04, 2013 2:54 pm

Bill Aycock wrote:

I was under the impression that any class car could run in TIR. Are ST cars disqualified from running in TIR, or is there just more of a pax incentive to run in ST?

TIR/RT cannot have ST entries as the ST* pax already is adjusted for 140+ treadwear tires ("street" tires) since that is specified in the ST* rules. Thus, only cars in classes that normally allow race rubber are allowed to run TIR/RT. Confused yet??? :shock:

Bill Aycock · **Joined:** Wed Sep 26, 2012 1:55 pm **Posts:** 117

Zach Hill wrote:

Bill Aycock wrote:

I was under the impression that any class car could run in TIR. Are ST cars disqualified from running in TIR, or is there just more of a pax incentive to run in ST?

TIR/RT cannot have ST entries as the ST* pax already is adjusted for 140+ treadwear tires ("street" tires) since that is specified in the ST* rules. Thus, only cars in classes that normally allow race rubber are allowed to run TIR/RT. Confused yet??? :shock:

So, rather than the ST class being a step in a natural progression of more and more modified cars, ST really is an island unto itself, but one you are forced to visit with a certain level of modification?

Seems a shame as there are so many ST class cars that are running all by themselves at events. I'm interested in tuning my ECU, but not sure I want to compete only against Noah.

Aaron Buckley · **Posted:** Tue Jun 04, 2013 3:05 pm

You still could run in tire using the appropriate *SP pax if you just want more competitors. - AB

Bill Aycock · **Joined:** Wed Sep 26, 2012 1:55 pm **Posts:** 117

Aaron Buckley wrote:

You still could run in tire using the appropriate *SP pax if you just want more competitors. - AB

But if I did that, I would be giving up additional PAX, without the benefit of the corresponding mods, no?

RTDS = .809 (what I normally run)
STX = .827 (what I believe my car would be in STX)
DSP = .837 (what I could run to stay in TIR?)

Aaron Buckley · **Posted:** Tue Jun 04, 2013 3:19 pm

Bill Aycock wrote:

But if I did that, I would be giving up additional PAX, without the benefit of the corresponding mods, no?

RTDS = .809 (what I normally run)
STX = .827 (what I believe my car would be in STX)
DSP = .837 (what I could run to stay in TIR?)

Yup... I'm sure you will not make up the PAX difference with ECU alone. - AB

JamesShort · **Posted:** Tue Jun 04, 2013 3:45 pm

BIll, electronic boost modifications are not allowed in ST* anyway. I assume your 'ecu mod' would change boost levels and therefore you'd have to go to RTDSP or DSP.

I was in this same boat when i started autocrossing. I had a WRX with an accessport which would bump me to BSP. Colin Anderson explained to me how the classing worked so I started flashing back to stock at events to run D stock. Then I finally realized the stage 1 crap wasn't worth it so I sold it and with the proceeds bought some real extreme performance summer tires and I was instantly faster. Tires >>> ecu mods

.

Just buy the tires and don't lose out on the ECU tuner 'toy' depreciation like me.

Steven Carter · **Posted:** Tue Jun 04, 2013 3:53 pm

PAX assumes you have a car fully prepared to the limits of the rules, and that you are an awesome driver competing against other awesome drivers, as it is based on the results of national-level events. For us locals it's not a great measurement, but it's the best available option.

ST is not an island unto itself, and the degree of preparation is between Stock/Street and Street Prepared.

In a similar vein, I drove with a novice who had ECU-modded his GTI/Golf R. He had something like 300+hp going to OE wheels and tires and no suspension improvements. OMG it was horribly understeer- and wheelspin-prone and really no fun to drive. If I could sway your desire, consider a suite of improvements (wheels and tires first->suspension->ECU) instead of just going for moar powah.

JamesShort · **Posted:** Tue Jun 04, 2013 3:59 pm

Another point to mention is with the SCCA Street classes (stock on street tires with a bit of shuffling) coming next year, who knows what is going to happen with RT/TIR from a THSCC perspective so I wouldn't let the category you compete in make too much of a bearing on your choices.

shawnwhipple · **Joined:** Wed Aug 20, 2003 6:28 pm **Posts:** 603

Bill, I guess it all depends what your goals are?

If you want to be competitive in a PAX based class like RT then you have prep your car to the max of the rules for the class it's in. That's why folks are saying look at wheels/tires as a first mod. This of course assumes you stay with DS legal wheels. Maxing out your car to DS rules will be the most cost effective way to be the most competitive with your car in RT/TIR

If your goal is a more powerful street car then do the ECU mod first, but if you do that you have to accept that your car will be less competitive for autocross.

Or you can max out the spending and fully prep your car for DSP. :twisted:

I hope you'll stick with driving a competitive car whatever class you choose since you are a good driver and I'd like to see you be successful at autocross.

Aaron Buckley · **Posted:** Tue Jun 04, 2013 6:45 pm

IIRC, the R32 is not turbocharged. - AB

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