The LFS Suspension Calc is a small and simple spreadsheet that does a few slightly complicated equations regarding spring rates and damping. It's a fast and relatively easy way to determine how stiff to make your springs, and how much damping to use for a given stiffness.
This spreadsheet, although technically usable on its own, does require the knowledge of the exact forces on the front and rear of the car. This can be determined with difficulty by yourself, or it can be determined easily and quickly by using Bob Smith's LFS GRC2, which includes a downforce calculator.
The first version of this spreadsheet, 0.5, is fundamentally flawed. It will give a decent approximation of the right values, but it is, in a word, wrong. Version 0.6 (hopefully) fixes these flaws, mostly by making the talented Bob Smith do the real work. This version is also a little easier to use.
This spreadsheet, although technically usable on its own, does require the knowledge of the exact forces on the front and rear of the car. This can be determined with difficulty by yourself, or it can be determined easily and quickly by using Bob Smith's LFS GRC2, which includes a downforce calculator.
The first version of this spreadsheet, 0.5, is fundamentally flawed. It will give a decent approximation of the right values, but it is, in a word, wrong. Version 0.6 (hopefully) fixes these flaws, mostly by making the talented Bob Smith do the real work. This version is also a little easier to use.