Steve said:
Am considering the Kumho v700 rear in a 245/40/17 and front V710 215/40/16. Any idea on tire life and TCS issues.
Why are you considering different model track tires for the front vs the rear? That's generally not advisable. For neutral handling, use the same tire, front and rear. You don't want to introduce an additional variable that is only going to confuse things.
TCS should not be a problem with those sizes on your '93. The outer diameter of the front is 1.3 percent less than stock, and the rear 0.6 percent less, so the front-to-rear ratio of diameters is changing by less than 1 percent.
Steve said:
Would like to get 3000 miles with a few track days per year. These tires have a treadwear rating of 30 in the front and 50 in the rear.
Are you planning to drive these tires on the street? Or only to and from the track? Most people only use track tires on the track (possibly also to and from the track, although these sizes should fit inside the car if you want to drive to the track on your street tires). In which case, you generally measure your treadlife based on track miles, not on street miles.
I've found that one big factor that affects treadlife with track tires is how the tread wears. When you drive on the track, the outer shoulders of the tire tend to get rounded off (and even more so on the left tire for tracks that run clockwise i.e. more right turns, and on the right tire for tracks that run counterclockwise i.e. more left turns). I've driven with some track tires like the Yokohama A032R, where this shoulder can get rounded off without exposing any belts, so you can keep driving on the tires until the belts show in the middle of the tread. As a result, these tires last longer. I've also driven with some track tires like the Kumho Victoracer V700, where the belts go further out to the edge of the tread; as the shoulder gets rounded off, the belts start showing, and you have to dispose of the tire even though there may be tread depth along the rest of the width of the tread. Which explains why I get a whole lot more track miles on the A032R than on the Victoracer.
I have not used either of the tires you mention. I have used several different kinds of track tires on my '91 NSX, all in the stock '91-93 sizes. (They fit inside the car so I can drive to the track on my street tires, and you can pick up used sets of stock '91-93 wheels for next to nothing!) I find that I'm generally getting around 1700 track miles plus 500 street miles for Yokohama A032R tires on the NSX, both front and rear, with tires heat cycled but not shaved, from the time they're new until the belts start showing. I get maybe a couple hundred fewer track miles on Toyo RA-1 tires, also heat cycled but not shaved.