Center of Turn on projection of the rear axle?

[MSI]

Q: According to Gillespie, the center of the turn must lie on a projection of the rear axle, with the radius of the curve through the center of gravity of the vehicle. The perpendicular of both front wheels also must also pass through the center of the turn.

A: In real cars, at low speed the rear wheels track inside the fronts. At high speeds the rear wheels track outside. There are also variations if the vehicle you set up is understeer, oversteer or neutral steer vehicle. (See the section on cornering properties in the and m-smac Input manual and/or the McHenry Accident Reconstruction Book ).
Wheels/tires operate at slip angles. And to quote from the John Bean "Wheel and Steer Alignment Technical Manual"
"Theoretically the front wheels should turn in a circle whose center is in line with the rear axle. Actually this is not true if the speed of the car is greater than a dog trot. Centrifugal force acts on the car to cause all tires to slip. The result is that the real turning center is considerable ahead of the theoretical center. Different cars have different slip angles which explains why all cars of the same wheelbase do not have the same toe-out on turns."