Quote:
Originally Posted by dradernh
Do you assume that to be the average sprung corner mass for each corner of the car? My corners, with ~4 gallons of fuel, 170# / 77kg driver, and with a measured tire and wheel weight of 45# / 20.5kg reduced from each scaled corner weight, are:
RF – 886# / 403kg
RR – 790# / 359kg
LR – 820# / 373kg
LF – 926# / 421kg.
FWIW, the coilover spring rates are:
Front – 350# / 61296N/m
Rear – 600# / 105079N/m.
With OEM anti-roll bars, I would say that qualitatively the car feels stiff, but not uncomfortably so. I find it to be both usefully trackable and very responsive away from the track.
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I assumed an average of 400kg per corner, minus 25kg per wheel and tyre, minus 25kg for brake, hub and suspension arms - for ease of calculation. A variance of +/-25kg at 2.0Hz would cause
a +/-7% variance in the spring rate at resonance i.e. 51,322N/m to 59,218N/m or 293 lb/in to 338 lb/in.