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To my knowledge, there is no simple formula for the effects unsprung vs. sprung mass. There are rules of thumb that seem OK to a first approximation, and there are formulae that let you calculate specific effects for particular masses sprung in a particular way. The latter require more inputs than we usually have conveniently available to us (e.g., motion ratios, masses of the specific parts, etc.), and the former are about a half-step better than wild guesses.
-soD
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