Friday, 19 April 2013

Modelling tires in rFactor

This is an idea I've been throwing around in my head lately, whereby characteristics are designed for individual tire compounds, and then transferred to different tire sizes.

Parameters in the TBC file like Heating and WearRate maintain what the average is around the full circumference of the tire. The heating parameter controls the effect of rolling and friction on the average temperature all the way around the tire, and the same applies to wear rate.

But tires of different measurements will have different surface areas. More rubber mass on the tire, more mass to heat up, and more mass to shave off when wearing the tire down. So, a larger tire of our compound will wear down slower and heat up slower than a tire of the same compound but smaller size, right?

This sort of thing extends to the tire width also. You could pick different load sensitivities and friction coefficients based on the contact patch size, and the heat distribution would surely be affected too. Camber effects would be more dramatic on a wider tire, and I also think wider tires rely more on air pressure to maintain their size than their smaller counterparts, and so are more sensitive to pressure changes.

But something else this particular method of tire modelling establishes is a relationship across tires for different cars. It's very common for the same tire compounds to be shared between different cars, with only the size being different.

This is something I'm still looking into myself, but I'm getting interesting results out of it. All I need now is more prototypes and GTs to test this on! :)

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