Ok so here's the info on how your supose to be able to download tuning setups. if you figure out how post the info here let us all no!!
All that being said… here’s my best tuning advice…
Go to Multiplayer Leaderboards, find the car you want to tune (in the appropriate class) and download setups (from the people honorable enough to post them) and “tweak”… anyone on the leaderboard (Top 10) probably had to do some amount of tuning (or plagiarizing) to get where they are. Leverage their tuning ability and try out their setups. If you don’t like it, try someone else’s… almost assuredly, you’ll find a setup that “feels good”… now go look for more setups by that person and in other cars and classes… they will probably feel similar
Have fun