mass, force and tire load

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The config is not compatible with VDrift master. For what car is it? How did you determine that mass distribution is 50%, by hand?

I did the following test. Take XS.car. Set engine and driver mass to zero. Use 4 mass points at wheel positions 250kg each. I get 2620-2640 Newton load at each wheel, 50% mass distribution. It is also confirmed by mass center offset y of -0.06 = (1.14 - 1.26) / 2 equal to wheel median along y axis.

The suspension force arises from the car falling down at each simulation step. This compresses suspension, increases suspension force. The whole thing is stabilized by damping, else it would oscillate indefinitely.