what tires are you running? just curious, the Yokohama S-drives I have are alright but they don't feel grippy enough.
NT01s. Theres a lot of things that go into grip of a tire that ive gathered over the last few years while working at a race shop.
1. heat cycles effect the grip. Tires can only go from hot to cold so many times, and max temp also affects this.
2. storage of the tire - tires typically shouldnt be stored in cold places for long periods of time. I tend do keep my race tires in my office.
3. tires you drive on every day dont make good track tires (refer to #1).
4. weather and UV index / track temp have things to do with grip
5. all tracks react differently to tires - Buttonwillow typically gets greasy after lunch and Buttonwillow isnt great for sticker tires. We found the track is faster on 1 heat cycled tires where as thunderhill is fastest on stickers.
