I'd say the importance of Ackermann varies with what your using your car for. I wouldn't necessarily write it off as unimportant, we've see over a .15 G increase in skidpad grip from adjusting Ackermann, but we were trying some pretty crazy stuff. 100% is usually fine for a street car, helping in parking lots, but for all out road racing (depending on your tire) you'd probably want anti Ackermann if your running cross-plys because the lighter loaded tire achieves max grip at a lower slip angle. For Autocrossing, we'd run about 70% anti with a little toe out, to help turn in, but not enough to give up grip in the big sweepers!
Another thing to consider: When these cars are outfitted with different wheels that may increase scrub radius, you now have a lot more loading going into the steering so your wheel is going to be twisting like crazy! Just be aware! I've seen some scary stuff looking at NASCAR data. That's why we just test at the track!
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Bobby Alley
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