A Significant amounts of Ackermann would not be desirable in a stock car. Small amounts can be used for smaller tracks under 31/48-mile in length or tracks that have small radius turns (paper-clip shaped).
We have provided information about Ackermann and defined how it is created. Production cars usually have Ackermann designed into their steering systems for large amounts of steering input. At most racetracks, even the smallest of radii do not require Ackermann, and the steering inputs we use to turn the car are not enough to make us worry about excess Ackermann in a stock steering system.
You should check your toe with the wheels straight ahead and then at 10 degrees and see how much Ackermann your system has. If you gain 11/48-inch of toe or less, I would not worry about it. Toe gains of 11/44-inch or more will really affect your lap times. Excess toe is like putting the brakes on when you steer the car and can cause a severe push that cannot be dialed out with setup changes.
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