Well thanks for the answers so far. I have been trying to find a clear reason on t'internet why a longer lever arm results in a softer ARB rate. Much is said about the greater leverage of the longer lever, but I still believe the added leverage is cancelled out by the equal size of the lever on the opposite side of the car, my schoolboy physics implies it would have to be.
However the wire ARB levers are not perfect - they flex a lot, and act more like springs. I think this may be the reason for the change in ARB rate, the long lever acts like a softer spring and absorbs a lot of the energy before it can be transferred to the other side of the car, the effect is duplicated on the other side.
I did do an empirical test on the B4 and yes, the bar is stiffer if you shorten the lever length. Wish I knew where the physics was actually happening but I suppose I shall have to either take another degree or just accept the results!
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