Quote:
Originally Posted by aerobod
With a sprung corner mass of 350kg (close to that of an M240i with driver and tank of fuel, minus unsprung mass)
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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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2017 M240i: 23.8K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro;
GTechniq Crystal Serum Ultra Ceramic; Suntek PPF