jpgunn

With the SCCA moving to eliminate R tires from Stock classes over the next year and PCA offering a Showroom Stock set of classes, I am trying to get some feedback from the community and tire manufacturers on what tires they will be offering that will work well on the 991 S and other models running 20".

Initially in the SCCA we will have a 140+ tread wear minimum for 2014 moving to 200+ in 2015. Are manufacturers going to be upping their tread wear ratings? Will there be a concerted effort by any to really up the game?

Hankook has RS-3s coming out in a large number of sizes for 20 inch wheels.

Is BFG releasing more Rival sizes? PCalhoun? Will Michelin do something too? MPSC's with higher Tread Wear ratings? There is a 20" and 21" for the 918 that has higher tread wear ratings.

How about Kumo, Toyo, Bridgestone, Yokohama and Dunlop?


James Gunn-Wilkinson
2005 SCCA Pro Solo and Solo2 ASP National Champion
Driving Porsche GT2

452gt3

James, great job at Sat. AX I was driving the blue corvette and had the white 991s. It was a eye opener to see what the 991s can do on street tires and I will also be waiting to see the answers to your questions for 20". I have been looking in 19s also because of limited sizing. Hope to see you out there next year.
Mike

jpgunn

Thanks Mike,

The car was really exceptional -- completely stock alignment, tires, etc. It would just do what I wanted it to every time. No push, and easy rotation on lift throttle (good 911 trait IMHO).

Hudyman

Super stock is not going to street tires...

jpgunn

Please correct me if I am wrong -- this is the way I am reading things.

Super Stock with R tires becomes Super Street R I believe.

Super Street is on 140+ for 2014 and 200+ for 2015.

From the May Fast Track:http://scca.cdn.racersites.com/prod/...strack-may.pdf

The implementation plan is currently as follows:
2014:
• Street Category will compete with full National status using the on-car designation “S”. Appendix A will be
considered new classifications and subject to the 12 month reclassification window listed in 3.2.
• Street-R Category will compete with full National status using the on-car designation “SR”. Appendix A will be
unchanged from 2013.
2015:
• Street-R Category will be limited to a single class, SSR, and will consist of only those cars listed in the 2014
Appendix A for Super Street-R.
This staggered implementation was chosen to allow those who are currently vested in the Stock Category a more tenable
transition path, while also giving this exciting new category to the vast amount of the membership who responded that
it is what they desire. The staggered implementation will mean a one year increase in the number of classes, but that SCCA Fastrack News May 2013 Page 14
will be followed by a net decrease in classes for 2015.
Additionally, feedback was consistent in desire to have a place for the fastest street cars to compete on the fastest DOT
tires. Given that Super Stock has been the best performing of the Stock Category classes, participation seemed to
echo this feedback. This is the reason that SSR will move forward following the transition. To ensure that this doesn’t
lead to category proliferation that the participation does not justify, a sunset provision has been written into the rules,
which sets a participation threshold for this class.

burglar

jpgunn is correct.

"Old SS" is going to stick around as long as it makes numbers at Nationals. It keeps the old classing structure and rules. Just named SSR from now on.

The rest of "Old Stock" stays as it was in 2013 for 2014, then is phased out.

New SS - Super Street - and the rest of the new Street classes - are on street tires and follows the reclassing structure in the November 2013 Fastrack. Uh, the 991 isn't listed there, which means it's classing is buried somewhere in some other Fastrack. Ugh.

sjfehr

Tech Bulletin in the Dec Fastrack put 991 (non-GT3) into SS and SSR.

http://scca.cdn.racersites.com/prod/...strack-dec.pdf

Hudyman

Thank you for the clarity!

But I am "super" confused on a different matter. How can they put the 350 HP 991 in the same class as the 400-430 HP 991S? 80 horsepower more with the 991S Powerkit is a ton considering it only weighs 75-100 lbs more than the 3.4 991. SCCA is usually good about separating the S variants of Coxster from the base model. What gives?

jpgunn

http://scca.cdn.racersites.com/prod/...k-dec-solo.pdf

#12581 Porsche 911 Classing Proposal
Per the SAC, the following new listing is added to both Super Stock and Super Street.
Porsche
911 (991 chassis) non-GT3 (2012-2014)

kjchristopher

Most likely because they feel the base is too good for AS. Assuming it was considered. Write a letter.

knfeparty

A Street is a total crap shoot. I've given up the little hope I had with my 996. Lots of old SS cars (Vipers, more 'Vette models) moved down into it, but the Porsches are staying put where they are.

sjfehr

Same reason they put the 306HP 987.2S in the same class as the 350hp 991 and 435hp 997GT3, I suppose. SCCA is deathly afraid of accidentally making a Porsche "the car to have" for a class. I daresay 991 would be an overdog in AS. So, it instead gets buried in SS.

I was actually planning to order a (base) 981 this winter with all the performance goodies to run in A-Street in 2014, but I'm terrified that SCCA is going to shuffle classing again, either by bumping the 981 to SS, or 981S down, or any other number of potential classing moves that would render a car I can barely afford instantly obsolete. So, I'm holding off a year instead.

Hudyman

The mid-engine platform is supposed to be superior in balance and transition to the rear engine layout, that's why they have the cayman/Boxster classed in SS. However, the 996 GT3 385 HP has won the last 2 or 3 nationals in SS, and I have never seen the Boxster/Cayman competitive in SS. They really should move the Coxster to AS with the base 997 & base 991. I sent an email to an SCCA rules person to no avail.

jpgunn

I think if there was participation by the Coxster owners they would be classed fairly. Of course without fair classing the Coxster drivers won't come out... I think the cars should be affordable enough now that there is no reason participation should not rise locally. Nationally it is hard to justify all the expense when a car is buried. Chicken and the egg.

sjfehr

IMHO, Boxster/Cayman's biggest weakness in stock/street class is lack of camber and other suspension adjustability. That's the single greatest advantage the GT3 has. There's just no way it can compete head-to-head against a GT3. I do fear it would be too fast for AS, though.

I don't think they're necessarily classed unfairly, I just think we haven't seen the right driver yet with a well-prepped car.