Subject	Q. about coilovers and spring rates
Posted by	Gordo NA2LS Daytona on January 30, 2019 at 9:20 PM
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Message	I had the car corner balanced. Total weight 3178 LF 867 // RF 865 >>> TOTAL FRONT 1732 (54.5%) LR 718 // RR 727 >>> TOTAL REAR 1446 (45.5%) ________________________________ Given the following OEM spring rates: TT Front: 168 lbs/in or 3.0 Kg/mm // TT Rear: 134 lbs/in or 2.4 Kg/mm NA Front: 168 lbs/in or 3.0 Kg/mm // NA Rear: 123 lbs/in or 2.2 Kg/mm ____________________________ Everyone keeps saying you need at least 7kg / 5kg to keep the car from bottoming out. But why would the car bottom out with less than 7.0 Kg on a coilover, when it doesn't with only 3.0 kg on stock springs? A Front Coil Spring Rate of 7 kg/mm is 392 lbs/in; and a Rear Coil Spring Rate of 5 kg/mm is 280 lbs/in. Why would I need so much more spring in a coilover compared to the OEM springs? Say for example, If my left front wheel supports 867 lbs and the spring is rated at say 200 lbs/in; wouldn't that give me approximately 4" of travel before bottoming out? What am I missing here? Is it something to do w/ spring travel being that much shorter on a coilover? _________________________________________________
Follow Ups	Q. about coilovers and spring rates - Gordo NA2LS Daytona 21:20:09 01/30/19 Coilover travel is only 3.5-ish (n/m) - Ted (92TT) 22:09:11 01/30/19 So to preserve a more streetable ride, then the key is - Gordo NA2LS Daytona 07:02:41 01/31/19 and ones that use non solid top hats mounts,(ie OEM tops). (n/m) - itsa300zx 11:24:29 01/31/19 Yes.. The term pillow ball is certainly a misleading one. (n/m) - Gordo NA2LS Daytona 15:28:45 01/31/19 How much travel do the KW V3 have? (n/m) - RonZ300 (Socal) 16:59:43 02/09/19 I found this coilover spring rate calculator... - Gordo NA2LS Daytona 07:27:48 01/31/19 Rate, shock/spring travel capability, load capability... - LitlElvis 12:50:06 01/31/19 It seems the two factors I didn't account for are: - Gordo NA2LS Daytona 14:58:59 01/31/19 lbsf=pounds force; not pounds per square foot (n/m) - itsa300zx 15:05:41 01/31/19 Thx. Now it makes sense. (n/m) - Gordo NA2LS Daytona 15:24:43 01/31/19 I'm not sure the harshness comes from the spring rate - LitlElvis 18:35:48 01/31/19 It makes sense that if the shock couldn't evacuate its - Gordo NA2LS Daytona 19:43:35 01/31/19
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