you embarrass me every time, because I come up with a lot of puzzles and usually I have very little information about the car.
As for our puzzle, I have two different sources telling me two different things about the championship run by this car, so I don't think this is the right way to find the puzzle. But in everything you proposed, none corresponded to my sources (which contradict or complement each other???). For your question, I will again answer no, but maybe in some countries it was called prototype sport and not in others,