Bill Wilson

After many years away from it I'm going to give NCCC autocrossing a try again. I'm pretty sure My '94 Corvette will run the Group II G class. Except for the engine and exhaust sytem mods made to the Vette for Bracket Drag Racing the Vette will be fairly stock for low speed autocrossing on extra wheels (Corvette aftermarket 17X9.5") that I have and tires which I need to buy.
What is the best autocross tire to buy for low speed events to be used on a Vette with a stock suspension and stock shocks? I do have a couple of five spoke ZR1 wheels that are 11.5" if someone things I should run them on the back. Oh one last thing I have an open trailer and can tow the Vette to the autocross events if needed.
Thanks for the advise.

VetteDrmr

First off, what are the NCCC rules for your class? Any wheel/tire limitations?

Want to help, but need more info.

Have a good one,
Mike

AUTO_X_AL

In 2 you can run the 17x11 ZR1 wheels at all four corners with 315/35R17 if you wish. You dont have to but in 2G you have the option of running just about anywheel you can get your hands on as long as you put "D.O.T." approved rubber on it. Alot of people say the Kuhmo V710 is a great tire that lasts quite awhile and is pretty forgiving. The Hoosier A6 seems to be neck and neck with the kuhmo so it really is more driver preferance than anything else I would think.

Al

Bimota Guy

No experience with the Hoosier A6, but the Kumho 710 was (is) far better than the Hooiser 5. With the rims you have you can put 275/40-17 tires. And the Kumho is less expensive. Though I sure would want a bigger tire on the back.

Carolina C4 Racer

Welcome back to the NCCC.
Come down to the Carolinas, lots of events down here.
I run Kumho 710's. 315's on 17x11 Zr1 wheels or 17x12 CCW's on all 4 corners of my 92 Group II G car.

AUTO_X_AL

The A3S05 Hoosier works well aside from the cording issues. I run almost the exact setup that CAROLINA C4 RACER runs except my ccw's are 11 1/2. You will thank yourself for being able to rotate tires and extend the life of them. The Balance is much better than even having a 295 in the front. I tried that and it was not good for us so stick with 4x315 and you will be a happy racer.

Bimota Guy

Well, the 710 will last longer and works better than the Hoosier 5, so you might want to try the Kumho so you can be...a happier racer.

AUTO_X_AL

The 710 is a great tire. I have gone through a couple of sets. The tread seems to far outlast the grip but very good and durable. I plan on running the A6's soon. My whole catch with the Kuhmo is this whole watering BS You water flowers not tires but hey what do i know. If the 315 A6's work really well i will post saying so. Although alot of people I know have gone to the A'6 with excellent results.

gkmccready

Can somebody explain the 'watering' of 710s?

GTB/ZR-1

They tend to get... ahem.... a little greasy if they're not watered (cooled) down on back-to-back runs.
My rears got hot on the Gainesville Test Track & it felt like the car had 2 round bars of soap for rear tires

gkmccready

How do the road racers survive for 20-30 minutes!?

Bill Dearborn

This is the first I have heard of any watering of the 710s. I use 275 fronts and 315 rears for both autocross and track events. The only problem I have had with them is the front 275s popping out pieces of tread rubber where they got stones embedded in them when I drove into the pits after a long track session. The last time I autocrossed with them both my son and I drove the car and it barely had time to rest. I would get in the car and make a run and as soon as I got back to the parking area he would get in and get into line. The tires had 16 runs on them in a short amount of time and even though the front tires were losing dime size spots of rubber they went well enough for me to get FTD and never felt greasy. On the track I usually start with 26 lbs cold and by the time I finish a 45 minute session they are usually right at 38 to 40 lbs. For an autocross I run a little more cold pressure (around 30) and they work fine. If it wasn't for the holes in the front tires I would be using the current set for a few more events. The holes show there is plenty of rubber left otherwise. If somebody is getting them greasy they are probably running too low on pressure and overheating the tire.

Bill

AUTO_X_AL

Hummm. Well in large part in Michigan almost everyone who runs the 710 waters them down to bring the tire temp back down. In Michigan there are quite a few serious racers that wont run them in a single driver car let alone a two driver car without significant cooling. Ice water seems to be preferred. Great tire to have in the fall and the spring but summer heat turns Kuhmo's to grease!

jwt1603

Pretty much everyone who runs 710s here in FL, especially two driver cars, waters them down at least a little between runs.