I proposed to add the game a series of races where you’re tied to compete with an specific family of cars from an specific brand and model. For instance, a series of races where you start with the Nissan Skyline 200GT-R (the oldest) and you need to complete an Amateur Races, 2-3 races and then Profesisonal same, 2-3 races and finally the “GT-FederationDriven” event where you use the protagonist car as its maximum PI level and specific restrictions requirements.
The idea behind is like to make a car a Project, a thing you want to evolve because it is required to be that car and in that specific PI level. Maybe for the high end tier races (GT-FederationDriven) the car needs to have the Body Kit installed and maybe an specific Engine/Drive Train swap to match the rules of similar World Championship real events.
But it doesnt need to end with a single model, for instance the 1971 before mentioned Skyline? make the user to race through decades with the next version of the iconic car in the same way up to the R35! Maybe it can be grouped per family of cars that has many versions, iterations, successors.
In case that to use actual world event and organizations (IMSA, DTM, CART, F1, GT Challenge, etc), make your own! Create your own Forza Federation of Automobile and creates differents events similar to real world organizations (Open Wheels, Endurance, GT, etc).
This is like that experience of starting with One car, push it forward because is required to be that one, if achieved, drive the next version, repeat pushing it forward, the PI I refer by pushing forward and as a closing event or races, drive the car in its maximum level, body kit required, specific Swaps required, specific weight, specific power that matches the Federation Event and let the player feels that they evolved the car.
L. Agramonte