MadMatt wrote:Interesting information there, thanks a lot ! I'm not advanced on the calculation point of view, but at least I can explain why !
My question was a bit naive, since you cannot know the EXACT rubber mixture used by the manufacturer. If all of them would provide the composition that if a company (like TüV for example) would test all of them using the same method, I am sure we could get a formula defining the friction coefficient depending on the temperature.
What would be interesting is to evaluate which components in the mixture has the most influence on the grip parameter. Durability would also have to be considered, but I can imagine the curve is not exponential so in the end it is always a compromise.
A shame this discussion is going to a dead end but that micro-waves method is interesting nevertheless ! Who knows what's next !
Sorry to be blunt, but you are being naive.
Even if you know the "exact" composition of the rubber, you still don't know how it was cured, what thickness it is on the tyre, how the tyre carcass influences the amount of energy input into the compound. In turn the race track layout will also affect the energy going into the tyre; long corners or short corners? Then you've got the track surface; what type of aggregate, how worn is it? How much more wear has it got since the last time we measured it. Is it contaminated with dust, how much rubber's down?
On top of that what suspension setup are the team running this weekend, what if we gain 10C tyre temp because they changed the dampers.
In the nicest possible way I'm sick of simulation engineers and people who play iRacer a lot thinking there's a closed form equation for everything... /rant