Still plugging away at this. Decided to upgrade my Porsche 914 to the heady heights of Rank A, with a PI of 834 currently. I can’t see how to push it any further, unless a new engine (and then starting again with the upgrades associated with it) will help.
Anyway, with that car I then took part in a couple of races, before deciding up up the opponent AI from Medium to Hard. Where “Hard” means “Cheating”, clearly. Suddenly, C and D rank cars both accelerate faster and reach higher top speeds than my high-end A rank Porsche. CHEATING.
And my auction fell through, as no-one had bought it. BOO and HISS.
Put it back up with a reduced buy price and starting price, and dumped a few unwanted prize cars up too.