Quote:
Originally Posted by Photonic
Countersteering increases front slip angle. This means understeer. You are increasing front slip so that the front end tracks out to match the rear track radius and keep the car pointed on a straight line. understeer = front track radius increases. which is what you are doing when you manage oversteer.
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Countersteer reduces front slip angle. Countersteer is required to reduce grip forces exerted at the front axle to match side force exerted at the rear axle and avoid a spin out.
Oversteer results from the tires at the rear axle running at larger slip angles than the front axle. This means the rear axle loses side force first. To prevent oversteer requires that you reduce the front slip angle so as to prevent the rear tires from reaching the limit of grip first.
Turning radius isn't really relevant, it's all slip angle.