This thread originally started as "are there example spreadsheets other than the FISI?" and it has turned into a detailed FAQ on how to use the physics calculator spreadsheet. Latest spreadsheet here: https://docs.studio-397.com/developers-guide/cars/car-physics/physics-calculation-tool Q: My car has no real aero (no diffuser, no front or rear wing). What do I do? A: Put in comment or Delete the entry in the HDV (the blocks FRONTWING, REARWING, DIFFUSER, FENDERS if any). Q: The cartesian coordinates are in reference to what? As an example, when I set X to 0 for the front wheel upper front arm, I see where it ends up in the diagram, but what actually is "0"? A: With help from Devin on Garage discord (https://discord.gg/q9FVQc3): So my interpretation/paraphrasing: Z is the front-back axis of the car (along center line from absolute center) Y is the up-down axis of the car (height above ground) X is the left-right axis of the car (distance from center line) all in reference to the absolute center of the vehicle Q: On the Susp tab, what is "pushrod"? In my particular vehicle case, I have a standard coilover shock and spring where the upper is mounted to the chassis and the lower is mounted to the lower control arm. Are these the "pushrod" measurements? A: Q: What is the best way to measure a real car to determine the cartesian coordinates (X,Y,Z) of the various suspension pickup points and arms? My best guess right now is to quite literally put the car on a giant piece of graph paper and determine the vehicle absolute center (X=0,Z=0) and then use a plumb bob to measure Y for each point in space. Is there a better/easier way? A: Q: On the "Spring" tab, what if I don't want to use N/m for the spring values? A: Starting on Row 65 there are some spring configurations. You can change the unit to kgf/mm You can change the min/max values You can change the steps The values in the dropdown (B34/B10) don't end up getting updated to the stepped values, though. They're still showing the calculated SI N/m values, which is not fun. But you can do the math to figure out what you should choose in the dropdown.