Tires

[reece146]

The Racer community has struggled with this problem for quite some time, since they use the same tire model we do. Whenever a Racer car has been imported the tire values have come with it. Look through the Racer sections of the Race Sim Central forums, you'll find quite a bit about Pacejka constants.

There is no easy way to get these values. Many tire companies do measure them (I think) but don't publish them, and purchasing this sort of information can be very expensive, as far as I know. However, I know very little about it altogether, and there may be a way to abstract the formula and estimate the values. There are also Pacejka editors, Racer comes with a simple 2D one and I've found simple 3D ones on the internet before.

I guess what needs to be done is to try to find a decent model of a car (Racer or other) and then take the curves to represent the tires that came on that car from the OEM.

If say, a `88 911 came with Dunlop D40 205/55VR16 front tires and the curves seem reasonable we can say in our look up table that D40 - 205/55VR16 is this curve. We'd just need to build this table at that point.

This assumes that the Racer model hasn't been teaked and is a valid set of curves of course.

It's something I want to take on eventually; culling this data out of the various forums and presenting the table.

Maybe an "ultimate" thing to do is to make a "vdrift spec" tire that has our own curves. I'm thinking ahead to the tuner/career stuff in the game.