David,
You're welcome. That's a good question about the Corvette. My humble guess is that GM wouldn't let a little redesign of suspension components stop them from achieving the geometry they were after. You can also change Ackermann by moving the rack forward or aft. As you pointed out earlier in this thread, you try to make each tire operate at its optimum slip angle. With a fairly well balanced car like the Corvette, the front tires probably operate at very near the same slip angle during a corner, which means adding a lot of toe out (Ackermann) might cause a lot of drag, especially with wide tires and short sidewalls. A less balanced car (higher center of gravity, more body roll, an "unloaded" inside front tire) or a car with a narrower front tire might not experience the same adverse affects from toe-out induced drag. Like you said, testing is the only sure way to work it out.
Pappy
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