If the car is handling properly the steering input is more about transferring weight than actually redirecting the nose of the car. In the middle of the corner the left front should be doing so little work (especially nonwing) that a dynamic toe gain shouldn't really make a difference. It's more so acting as steering offset because you could adjust how far the RF turns based on the same steering input. The big worry that I would have on the dirt would be how darty the car may be down the straights if you're changing the Ackermann, the car would feel significantly different.
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Jim Gardner
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