Pacejka tire coefficients

[orangutan]

I have not comprehensively looked into all the coefficients, but in some little side work I was doing, which had me plotting some angle/Fy curves from the engine itself, I noticed that Fy for the touring tires was way way too high. The problem turns out to be a1 and a2 grossly amplify the lateral grip. If you want that much lateral grip, like an open wheel slick, you should be using a higher friction coefficient.

The spirit of the Magic Formula variants is that they peak near mu*Fz. D, the lateral peak term, is mainly to model load sensitivity, which Pacejka himself even calls 'peak side force *reduction* factor' in his 2002-2006 book.

I have not dug into your other numbers, but the general shapes of your curves seems fine enough, so I'd just try to fix your peak factors. BTW, those beckman Ferrari numbers are whack too -- they amplify force as well, even worse than your touring numbers.