Here is a write up I did on another forum. It might be worth your time to check out the Kumho v710. Rumor has it it will be the spec tire for the POC in 07.

We spent 6 hours testing different track tires a a year ago @ PIR. (Our tire of choice in the past was the Hoosier R3S03.)

Hoosier R3S03 and A3S03
Michelin Pilot Sport Cup
Kumho Ecsta V710
Kumho VictoRacer V700

By far the best tire in the group was the Kumho Ecsta V710. It was far superior in feel, bite, responsiveness, and getting the power down. Not ta mention they knocked almost 1.25 sec off of our lap times versus Hoosiers (the A3S03 and autocross tire could not even come close). 1.25sec is a lot on a 1:24 lap time The Michelin felt ok but could not compare to either the Hoosiers or Kumhos.

Kumho has done a great job developing these tires. (night and day differnce from the Victoracer) Hopefully, Kumho will have more sizes available soon. I would love to run these on my street car since they are DOT legal. Give'em a try. You will not be disappointed.

 

Toyo RA1's IMO are nothing short of amazing!!!!!!!

 

Did you test them on a 911? In my experience, the rear weight bias really tests the sidewall stiffness. Soft sidewall tires do not do well on the 911 due to extreme yaw..

 

This explains some of the complaints about the PS2's (?)

 

I have PS2s and was happy once I pumped the rears to 44 PSI. I now run 36F 44R. The added sidewall stiffness in noticeable. They grip better in RWD than my contis did in AWD. No joke.

Here's a controversial opinion. Porsche claims to have excorcized the 911 of snap oversteer with the 993. I think they just fattened up the rear tires (of course I'm sure a lot engineering went into the suspension as well.) My car definitely exhibited some (mild) yaw induced oversteer in off throttle turns until I pumped the rears up.

 

I noticed on my Toyo T1R's the sidewalls and tire was WAY TOO SOFT, but in fact it helped me grip better straight line and under boost out of a turn, but t felt sloppy sometimes into the turns!

The Toyo RA1's have a soft sticky compound once heated up, BUT the sidewall is very stiff not soft, like the Pilot Cup Sport Michelin's.

 

I have considered the RA1's but they werent on Tire Rack so I left them alone . At this point I'm gonna try a few and see what suits my driving style. I dont want to be sideline by a little wet, so something that's decent in the wet would be good. I'm almost certain I will be getting some R6's because I found a good deal on some. After that, I'm thinking.

A048 (Rode on some yesterday in a noble M400 , that car is insane! and I like the tires too)
RA1 (dont have a lot of info but have heard all good things)
MPSC (lots of $)
Kuhmo (hadn't heard all good things about these, though I'm not sure if it was the V710's)

 

It seems to me that the tire answer would be the MPSC's have them heat cycled before you get them. They are capable of driving to the event and on streets and will at least tolerate some wet conditions.
Remember each tire is really designed to be best at one thing. Others that claim all round greatness usually are not really good at anything...ie all weather tires!
Again, the only way to help the problem is multiple wheel sets, I fought this at first but once you got extra wheels in the garage your performance improves!!

 

Tom im telling you ive been on both on the track, same car, Toyo RA1's blow the MPSC's out of the water, im serious!

 

I had MPSC's on my car when it make 580 rwhp and I absolutely hated them. I sold them after only 1 week of ownership.

 

I'm not worried about driving on the street, first of all because I live only 7 miles from Road Atlanta which is where most of my track time would be spent. I also have a 24 footer for long trips which I will probably take to Road Atlanta for events just in case.

I do agree that I should have multiple wheel sets but I'm not serious enough into racing to buy them all rigt now. With my first set of track dedicated wheels, or maybe even two sets, I'm gonna try a few sets of tires and compare the ones that are pretty close to the came category, from there I can narrow it down. With all the sessions over weekends, I'm sure I can try at least 3 for this season alone.

I found a couple of tire websites that are substantially cheaper than tires rack, which makes buying multiple sets of tires even easier.

 

and what are those sites!

 

onlinetires.com has good prices on the Kuhmo V710 and better prices on the PS2's if you use those for DD like me. I havent found RA1's anywhere else so someone let me know if they are cheaper somewhere else.

Tiresavings.com also has some favorable prices. the MPSC prices are very good.

havent found the advans for better anywhere else.

neither carry hoosier



AM I allowed to post this? If not please delete. Not advertising, just did a search.

 

zippy, can you elaborate more?

1st, i'm assuming these were 18"s w/ your current JIC suspension?

2nd, did the car hydroplane at all? or less than you expected?


i have Motons and 19" 315 PS2's and the car is downright scary in the rain. i need to find something better; if i can get a stickier tire and improved wet traction, i'm all ears.

- chuck

 

Well because of you I am trying them as my next set, which should be soon!!

HeavyChevy, I am jealous at your location near Road Atlanta, lucky guy. But a spare set of wheels would be as cheap as a set of extra tires.
Get you car set up and we will meet up in the spring!!

Chuck, motons, 19's. and PS2 havent seen that combo before. Is that just your street setup?? curious cause just went to motons myself, but 95% track driven car. Are you having trouble with the motons or the tires? thanks, tom