Thanks for posting!This is the Spring Rate calculator I used. https://www.thespringstore.com/spring-rate-calculator.html
I used calipers, to measure the springs wire diameter, counted the number of coils and measured the outside diameter. For my Badlands the calculator said 160lbs for the fronts and 253.8lbs for the rear. So, my reasoning for a stiffer rear spring is, you have raised the front rates but not the rears. As I understand your post, you have now switched to a 14" front spring, for the Badlands? If so, I think that is an excellent choice. In looking at my OEM fronts again, the mounted length, still on the strut but off the car is 11" but of course it's compressed, on the strut and I don't actually know its free length and it may well be 14" as well. The Badlands OEM rear springs are definitely 13"!
I'm not sure what the motion ratio of the rear suspension is and I haven't attempted to calculate it yet but it's very different than the front struts, so my suggestion of a 200lbs front and a 275lbs rear may well be an underestimate of what the rear rate should be, if the OEM handling balance is to be considered. Of course we aren't running these on a race track and if a customer doesn't mind the probable increase in understeer, due to a 50lbs difference, in front to rear spring rates, instead of the OEM 90lbs but instead wants to maximize the comfort aspect, of a minimally loaded rear suspension, then a 250lbs rear spring is a good choice. I can't say the 52lbs increase (160 to 212) in the front of my Badlands has resulted in any increase in ride harshness, so I'm thinking a 25-50lbs increase in the rear would be much the same and would reduce rear sag with an increased load and improve handling, a little.
If I remember correctly your shocks are rated for 200-350lbs? What rates are you suggesting for the overload springs?
I was looking at this kit once my factory shocks go out with the leveling kit.
I have had bc coilovers for other coils and I am even considering these for my FRS track car.
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