You can also affect the self-steering by using suspension geometry. IIRC, in the front you want leading arms to give you the "steer into the wind" effect, while in the rear you want trailing arms for the same effect. The notion is that between the compliance in suspension bushings, flexing of parts, and so on, the arm will pivot roughly where it is attached to the chassis of the car when a side-force is placed on the car.
-soD
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