Just a curious observation that I want to share and validate.
Before NSXPO 2003, I installed a set of new Yoko AOH22 oem tires on my 16/17. Drove about 500 miles before getting onto the track at Infineon.
The pressure build up in the first session was about 8 psi in the rear and they were reading 36 front and 45 rear! I had started with 31 and 36 cold and I was taking it easy as I had a lot of wiggle in the rear given they were not heat cycled yet.
Got them down by 3 psi and the following session driving a little more aggressively, they got back up to 36 and 44! So that is almost 12 psi from cold on the rears. Lowered them again and by the end of the day I was getting closer to my normal running temps but they were over my benchamrak of 31 and 40 when hot. On my older Yokos, the pressure build up was no more than about 5-6 psi on the fronts and 7-8 psi in the rears.
Well this weekend I was at Infineon again, and started again with 31 and 36 as we had wet track and it was drizziling. I normally start with an aim to get at 27-28 front and 33-34 rear cold. The morning sessions were easy driving. By afternoon as the track dried and the sun started to come up, the pressure started to get back by about 10 psi on the rear and 7 on the front. Lowered it down by 2 psi ...... following sessions they got back to 36 and 44 ........ car was still wiggly at some sections and I could tell it was from too much tire pressure so had to take cool down laps before picking the pace again ......
So my question is this, how many heat cycles does a "new" high performance street tire need to go through to settle down, or how many street miles does it take? I have now some 1100 miles on these tires, of which 330 miles are on the track - 200 miles qualify as really pushing the tires.
Before NSXPO 2003, I installed a set of new Yoko AOH22 oem tires on my 16/17. Drove about 500 miles before getting onto the track at Infineon.
The pressure build up in the first session was about 8 psi in the rear and they were reading 36 front and 45 rear! I had started with 31 and 36 cold and I was taking it easy as I had a lot of wiggle in the rear given they were not heat cycled yet.
Got them down by 3 psi and the following session driving a little more aggressively, they got back up to 36 and 44! So that is almost 12 psi from cold on the rears. Lowered them again and by the end of the day I was getting closer to my normal running temps but they were over my benchamrak of 31 and 40 when hot. On my older Yokos, the pressure build up was no more than about 5-6 psi on the fronts and 7-8 psi in the rears.
Well this weekend I was at Infineon again, and started again with 31 and 36 as we had wet track and it was drizziling. I normally start with an aim to get at 27-28 front and 33-34 rear cold. The morning sessions were easy driving. By afternoon as the track dried and the sun started to come up, the pressure started to get back by about 10 psi on the rear and 7 on the front. Lowered it down by 2 psi ...... following sessions they got back to 36 and 44 ........ car was still wiggly at some sections and I could tell it was from too much tire pressure so had to take cool down laps before picking the pace again ......
So my question is this, how many heat cycles does a "new" high performance street tire need to go through to settle down, or how many street miles does it take? I have now some 1100 miles on these tires, of which 330 miles are on the track - 200 miles qualify as really pushing the tires.