Suggested R compounds and wheels for CS
 

Has anyone campaigned a twin in C stock this year? I was considering giving it a whirl on the local level. I don't want to modify the car but I'd still like to hit an autocross or two every month. I was wondering if there was a proven R compound size that worked best.

Any suggestions?

Since Hoosiers are going away from stock next year, it's probably a moot point.

Hoosier A6s would have been your drug of choice. Now you have may drugs to choose from in many different sizes - RS3, ZII, Rival. Check out the RTR thread.

season's almost done, just run what you got and wait until they update the rules for 2014

then you can focus on researching and saving for some high-performance street tires

@Oldfatguy you can run one more year with R comps as Street R, but I don't think there will be many in C Street R. I'd assume most would adopt the new Street rules and go directly to street tires only.

What the what? Guess I've been away from the game too long. So no R compounds on a stock car? That's wild.

yeah, you can arrive and drive a car without having to change tires and still be competetive, go figure.

I was gone 5 years and had no idea. You had the sense to ask first while I didn't. :) Bittersweet as R comps are so much fun, but the huge price cut will be nice.

Do I smell shaved Rivals and RS3s? >.<

I know very little of AutoX, outside of what some buddies tell me...

Shaving street tires for a competitiveedge is the same as getting a hooker drunk before fucking her.



Like… seriously?

When guys are in it to win... the cost of tires is minimal compared to other expenses. Street tires are cheaper than Hoosiers too.

I know a guy local to me that literally takes a full spare car with him. To go try to win cone dodging championships.

Well, at least you missed all of the drama :lol:

Wow I can imagine. Last local championship I won was in STS on Falken Azenis if that tells you how long ago it was for me. I was thinking of running R compounds only to permit me to run an otherwise unmodded car and be competitive. I don't mind monkeying with the alignment and camber with crash bolts I was just trying to avoid bolting on power adders. How big of a disadvantage will I have if I don't prep to the max in RTR?

RTR is the same rules as C Stock, with the only exception being that tires need to be 200 treadwear or higher. So the only prep available is factory crash bolts, dampers, and either a front or rear swaybar, but not both (that is also a rule change since you last autocrossed probably - they opened up the rule to be a swaybar at either end).

As I understand it the car is competitive out of the box in RTR - most are running OTS Koni yellows, max front negative camber, and a mildly stiffer front bar, 225/45 and 235/40 tires seem to be successful. There are a few good RTR threads in here so you can see people's setups.

@Oldfatguy for legal front camber you'll need 901000394 (Subaru) / SU003-02818 (Scion). It's the same bolt used in the lower strut mount hole.

Thanks a bunch fellas. I'd give you an official "thanks" but I guess my post count is too low.

How embarassing

No problem! Just have fun with your car at events.

It was wild that "stock" cars were on R-Comps before!

Keep up with the times for Nationals (going on right now) here: http://sololive.scca.com/

That way we can all watch RTR and see who is winning on what tires. Hankooks looked decent for STX but on camber challenge cars in Stock, I think the Rivals are going to take it. We'll see!

Amen.

Got a couple MR2's in CStock on Hoosiers and I'm consistently beating them with my FR-S on Rivals.

Clarification, Street class will be 140 treadwear next year and 200 treadwear the year after. Unless SEB changed that too...

I ran 245/40/17 A6s but sold mine a couple months ago and bought some Rivals. Ed Jones (edj) on here was using the same tires but switched to street tires for nationals since the BRZ/FRS isn't competitive with the current CS cars and he had a better chance in RTR.

Good catch on the tire rule. At nationals the winning RX8 in STX used two sets of shaved 235/40/17 Toyo R1Rs, one for each day. Theoretically that's probably the fastest tire for the BRZ/FRS, but they only last 15-20 runs, maybe a little longer on the twins. The 195 size of those tires is explicitly banned my hope is they do the same with the 235/40/17. He probably spent $1600+ for tires to run at one event which is crazy IMHO but perfectly legal. R1R is still 140, the other fast tires are all 200 now.

and as it turned out i didn't have much of a chance in RTR either... :(

if anybody is interested, I have 4 used 245/40R17 Hoosier A6 tires for sale (36 runs).
plus i have 1 brand new sticker A6 in the same size for sale also. PM me for details.

eric

And this is why the thought that 200tw street tires solve the tire expense riddle at a national level is assinine :bonk:

Next year I'm going to pull a Braun and run a fresh set of shaved Toyos for every run at nationals :lol:

Just curious, but why should the 235/40/17 size be banned? Gearing advantage?

I was wondering the same. The 195 was banned because there is a difference in compound depths. I believe that all sizes other than the 195 have the soft compound go down to about 3/32nds and then a harder compound after 3/32nds. The 195s have the soft compound all the way through the tread so they can be shaved while the other sizes can't.

Isn't that always the case on motorsports?

I thought the same too.

It was found last week at Nationals(obviously others knew it before, but it's now more commonly known) that the 235/40/17 R1R is akin to the 195/50/15 (aka cheater street tire).

As for tires, The Rivals just weren't competitive at Nats (the surface didn't mesh will). RS3s blazing hot and ZIIs stone cold were the tickets.

Other than these cheater tires, you won't see much shaving I feel. The RS3 is best after 1-2 event break in. ZIIs as well. Relatively consistent until down to ~3/32 left. Though we may see the field change as new tires are developed specifically for the rules

Thanks for sharing

Good to note. I was leaning toward the Rivals for my next set but maybe I will take a second look at the ZIIs. The Hankooks are great for STX where you can have a lot of camber but I have to run mine at 45psi in the front to keep off the corners with only the 1* (ish) legal in stock form.

Just to add information, my ZIIs were worn almost to/at the wear bars (is that 3/32"?) at Nationals. I ran RTR and thought they lacked some grip, probably too far gone for this event/course. They also feel a little harder at this wear level, probably just because of the lack of rubber. They did not grip well at all on the west course (80's, cloudy and spitting rain). I lowered the air pressure to 34F/32R and the rear end seemed to stay in place much better, but still not confidence inspiring. They did seem to grip better on Friday, 93 and sunny on the east course. If I make it to Lincoln again I will have a fresher set of ZIIs. Looking at the overall results, I still think they are competitive in the street tire classes at Lincoln.

I'd definitely say they are letting go around that 3/32" then. I havent had any that low on ZIIs. I know my RS3s were decent down to 1/32, didn't really feel significant drop until 2-3/32 but they were still usable (that was local events mind you).

The Rivals seem to work pretty well everywhere except Lincoln... If you are normally running on asphalt they will work well.

I'm hoping the 235/40 R1R gets banned because it might be the tire to have on a C-Street BRZ but nobody wants to run a tire that only lasts 20 runs.

This. This. This.

In ST*, it's going to be legal, like the 195/50, I feel.
But in RT/Street, this needs to be banned, just like the 195/50/15 is.

Where do I send letters to the SEB? That part is new to me.

use this link to write to the various SCCA boards.

Your newsletter. I wish to subscribe to it.

I never heard that about the 235 Toyos. Good to know.

I am personally still sticking with the Rivals. I like the feel and I don't drive on concrete in my region.

Definitely. Not a lot of point in switching to street tires if you gotta have a new shaved set every 20 runs to stay competitive.

I wrote the SEB asking this be reviewed and hopefully banned. Quoting my letter below if anyone wants to see it for any points to make in their own. Please write them to see if this can be rectified before C-Street becomes ruined on it's first year out.