It's written to be as S550 specific as I can make it. I've made all sorts of assumptions, so it won't be perfect. There are no actual suspension geometries involved. Most good racing springs are #/in (at least in the US), so I left them in imperial units.
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Click on this. I think it will be what you're looking for if you want to tailor the numbers to your car. A live rear car is going to be a little different in how it produces ride/roll rates, but you can tune it for the S550/650 variants.
I meant is the vehicle assumptions/geometry inputs not able to follow the metric and imperial button selection? I can convert everything. I just didn't know if this was a bug or has to be metric inputs?

