Quote:
Originally Posted by BackOnBlack
Tires - There is so much to say about the tires. In short, the PS4S is certainly not the right tire for track events, particularly for intermediate and lower level drivers. Better and more experienced drivers can probably manage them more effectively, but then again, their speed would be much higher, demanding more from the tires. I don’t think these tires are suitable for anyone on track. They are superb on the street and even autox, but track driving needs a lot more. They gained heat way too much and too quickly. They behave noticeably inconsistently as they go through different pressures and eventually become rather greasy, but not dangerously so. My tires would gain between 10-12 psi within the first 6 or 7 laps, and track temperatures were not any higher than 45-50 deg.
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The fact that it was relatively cold outside is precisely the reason why your tire pressure went up dramatically. The same would not have happened on a warmer day.
Think about it. Cold air is denser, so you need more air to reach a certain PSI threshold on a cold day. As the air warms up, it expands (which means PSI goes up). If you were starting with warmer air, there would be less of a change in temperature after multiple laps.