Of most interest to me are the low rates on the Boss 302 ... 148F/186R lbs/in,
Boss 302 Laguna Seca 137F/191R lbs/in. These seem REALLY low for a performance oriented car - and higher in rear than front - ???. Am I missing something here?
Tab,
I'm not sure about the Boss but I know on my 2011 GT the front bar is actually glued (wtf!!) to the sway bar bushings. So the effective front wheel rate likely is higher than the reported spring rate at ride height. Something about reducing squeaks. I don't think it was glued on the 2005-09 models. The rear asb is not glued.
Also remember the Boss models came with a staggered setup so more rear bias may be appropriate?
It seems a lot of the custom coilover track setups run approximately twice the spring rate in front as in back, just as a general reference point. But as you say, lots of variation depending on sway bar sizes, rear spring mount location, etc.