Or the equivalent equation from OptimumG technical papers ( ) Using the equations Milliken book (p.589 and 596) (The spreadsheet can be found there: FCM_MSDS_1_6NA.xls) So let’s start with FCM’s result when only considering the front springs for the roll stiffness (roll bars diameter at 0): Since I don’t expect anybody to simply believe my words, I will demonstrate the error with references: I did email FCM to inform them that the spring’s contribution in roll stiffness is twice the actual value, but I did not receive any answer and the spreadsheets are still the same. I have been using those spreadsheets myself to calculate FRC% until I discovered the error in the roll stiffness calculation. First of all, I don’t usually contribute to forums, but today I’m making an exception because I believe everyone should be aware of the obvious mistake present in FCM’s spreadsheets.
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