Quote:
Originally Posted by PST
As far as what kind of input I'm looking for, I would love to hear someone else's thoughts on that plateau in temps at the last big corner, more specifically my theory relating to sliding vs. static friction. I've got some books on the way to hopefully provide some more insight on that behavior.
Regarding the hysteresis of rubber, my understanding is it's all extremely proprietary and compound specific. I think the only way for us to determine the "heat life" of these tires is anecdotal.
Sessions range from 8-15 laps, max 25 minutes. When I get into the shop in a few hours, I'll post up some more detailed information about the session duration. I don't have pyrometer data for the last half dozen sessions.
Basically, I'm aware the tires are heat cycled out, but I'm trying to narrow in on the best way to confirm that with the IR data. If that plateau at the end is what I think it is, that's a clear sign that we reached the tractive limit of the tires much earlier than before.
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I think you're not too far off with your hypothesis, however I would put it in a simpler frame of reference, consider a hard low grip tire. Under duress compared to a stickier grippier tire, the hard tire will flex less, heat up less, and do less work providing less cornering force.
As the sticky tire has heat cycled out and lost it's compliant grippy nature it has morphed into a harder less sticky tire more resistant to cornering forces and heating up like the sticky rubber was.
Under what mechanisms it does that, well you'd have to infiltrate a tire manufacturer's racing division or a privileged race team to get anymore insight than the books your ordering.
But it sounds like you're getting <100 quick laps which translates to <130 minutes of hard running out of RE71R, that's not even 2x track days for us regular folks...