Where do the setup files go?

[smasha]

Searched the game folder,my documents,app data.

Nothing.
Did a quick google and nothing.

Ok in my documents.

Getting too old.

 

[Mestarn]

Check out My Documents/Assetto Corsa/Setup/<car>/<track>

 

[Sam Eaton]

Searched the game folder,my documents,app data.

Nothing.
Did a quick google and nothing.

Ok in my documents.

Getting too old.

The setup folder is only created when you 'Save' a setup. Just open the setup window when you go to track and save the default setup. Then exit the game and you should have the setup folder in the location @Mestarn provided.

Alternatively create the folder yourself

p.s I think you've already resolved the issue, but may help others.