Fyi on my CORTEX Jri i ran 650F -800R
k, so what bar and what rates (ie hole location) are you using?
Cant find the graph.
Keep in mind that as you start running more an more aero, controlling the front ride height is *much* more important than controlling the rear. Your 950 rate is right in line with the GT4, but it could easily be your original rear spring was sufficient, considering they're running a stronger tire. The overall roll-couple distribution is usually more heavily influenced by the bars than the springs. I try to keep things simple...adjust springs for heave and pitch, bars for roll. I'm curious if you find a difference in powerdown or the ability to ride curbs with the stiffer setup.
I went from somewhere around 275 to 450. The ride is pretty marginal on really rough stuff (it's fine around town in normal life or on the freeway), but the handling feel is pretty damned good. I've got to fit a shorter spring for clearance and 450's aren't available. At present, I think I want a 400 on the street and a 500 on the track. For heavy duty track work, though, I think something in the 600-700# range is appropriate if you have a tire which can support it.
900lb/in WHEEL rate? or since many designs use 0.5 motion ratio at the spring, the wheel rate is 0.25 of 900?
No, the actual spring. Don't overthink it. There's zero science involved. If you're ever completely lost, just get a 900#/in spring and put it on the back of the car. It'll be 'in the ballpark.'
The idea why i went up is based on new DF expectation. So after calculating 150lbs more DF each front wheel i calculated in percentuage the additional load. Amd bought the appropriate new spring rate. The rear followed the same % so if i went 15% more spring in front so i did for the rear.
That sounds logical. I love how wild you've gone with the car. The thing's a beast.
