[mkodama]

Originally Posted by tsk94

The FCM spreadsheet isn't good.

Use this one: https://robrobinette.com/Suspension_Spreadsheet.htm

Much easier and more intuitive. The only thing you need to know is the sway bar rate. Which for this car is easy to find out.

The roll stiffness math looks broken on that spreadsheet; the sway bar rate isn't being added to the spring stiffness, but is instead mixed in with the radians to degrees math.