To contribute:
m_1 (unsprung mass) = 37.6 kg
m_2 (sprung mass) = 280.4 kg (front) 244.5 kg (rear)
k_1 (stiffness of tire) = 350 N/mm (at 30 psi)
k_2 (stiffness of suspension) = motion ratio * spring rate = 2.11 N/mm (front) 2.8453 N/mm (rear)
We can construct a piece-wise interpolation that's easily mapped using a "spline" fit.
How to Spline Like a Boss
note: Sign convention usually has compression as positive displacement/velocity and rebound as negative displacement/velocity.
damping coeffficient = Force/velocity
damping ratio = actual damping coefficient / critical damping coefficient
We want a damping ratio of nearly critical (1.0) for roll and pitch modes, but ride can be 0.5 - 0.8 for some driveability.
If anyone has not read these, please do!
OptimumG Technical Papers
WRT ride frequencies:
spring rate = 4 * pi^2 * ride frequency^2 * sprung mass * motion ratio^2
2294.2 = 4 * pi^2 * f_r^2 * 280.4 * (1/0.92)^2
f_r = 0.42 Hz
That's a very soft ride. Sway bars stiffen it up in roll though. That's another calculation for another day.