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Originally Posted by sperry
But speaking of adjustable bump steer, I don't think I've ever paid close enough attention to bump steer to know how to adjust for it... really, I just put the car on the line it needs to apex properly, and react as necessary to keep the car where I want it... I don't think I've ever consciously experienced bump steer to the point where a voice in my head said "woah, I which that bump steer didn't happen", so the idea of tuning it seems near impossible.
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Well, that's just kinda the wrong way to think about it. It's really not
bump-steer, it's
roll-steer that you're tuning. It's wheel steering behavior in response to suspension movement - which happens every time you turn the car in to a corner. Consequently the roll steer has a significant effect on handling. This applies to both axles, btw - not just the front end.
At MM I ran through lots of iterations of different bumpsteer spacer arrangements on the racecar's IRS, and plotted the behavior out for them all; then when we tested the car at the track we were able to improve the IRS handling from stock quite a bit with that adjustment alone, and shave noticeable lap time.