Quote:

The actual rate you get at the wheel from a torsion bar depends on how long your lower control arm is (B/E different to A) and how wide your wheels/tires are.



Are you sure about this? I had always thought that, because the torsion bar is directly connected to the lower control arm inner pivot, the spring rate is the same as the wheel rate, regardless of the length of the LCA or the wheel offset - in contrast to any coil spring setup which necessarily has to be mounted somewhere between the control arm outer pivot and inner pivot and so only a percentage of the spring rate would act on the wheel, the actual amount depending on the length of the control arm and where on the arm the spring is attached (and in which case, the wheel offset would move the outer pivot and so affect the ratios and the percentage of the spring rate acting on the wheel).

Of course, I've been wrong before. . . .