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When the Roll Center gets close to ground level, it moves left or right dramatically for small changes in dive and/or roll. Is this correct?

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When the Roll Center gets close to ground level, it moves left or right dramatically for small changes in dive and/or roll. Is this correct?

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The program IS calculating the Roll Center position correctly MATHEMATICALLY. When both instant centers are at approx. ground level (0.0 height), minor changes will move the Roll Center left or right considerably, but not change the height much. Most circle track cars are set up so the instant centers and Roll Center stay well above ground, so this does not become an issue. This brings up a debate about Roll Centers. How critical is the position left or right. Some “authorities” only use the Roll Center HEIGHT to determine handling characteristics. Most experts agree that asymmetries in spring and wheel rates left and right have a large effect on how the body rolls. This contradicts the simple Roll Center theory that says the body rolls about the Roll Center, and spring rates have no effect. Performance Trends is simply showing you the mathematical roll center and letting the user decide how to use it.

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