Many years ago, Race2Play was a racing community who presented Setup Developer. It was a free tool learning how to build a car setup. I found it in the archives and like to share it with anyone who's struggling to build a good and stable car setup. This tool provides setup changes based on your feedback and helps to understand carhandling without reading lengthy setup guides. Description can be found HERE. (NOTE: Don't use the download link in this article as it doesn't exist anymore) Send me a pm if you're interested in a free copy.
Is this the excel sheet? Was very useful and still is. Tim continued to expand and develop this with a full graphical interface as well https://store.steampowered.com/app/840690/Setup_Developer_Tool_2018/