Engineering calculations on something like this are next to worthless. Engineering calculations generally rely on highly conservative assumptions designed to make sure whatever it is doesn't break. More detailed calculations make it cheaper/lighter/etc, but are still highly conservative. You can't really do the same with car handling. Someone probably did calcs to pick the initial springs and shocks*, but as an engineer (a real-world engineer, not a student), I can assure you that it was all trial and error from that point on until the sweet spot was found.

* said calcs were probably based off a similar car and scaled up/down, vice calculated from scratch.