I remember with V8 Supercars 2 (or Toca 2, whatever its called in the relevant countries) that al the races were fairly easy to win, except for the last race. And that was using the original disc so it had nothing to do with any protections kicking in.
Anyway the last race was extremely hard to win, every time once the lead car got in front that was pretty well the end of the race as I could never catch it, didnt matter how perfect I raced.
But, what I did was made sure I got to the second corner first and made sure I braked hard causing the other cars behind to crash into each other and therefore trapping the car that always won in with the crash. That way I managed to get a decent enough lead and all I had to do was to drive a perfect race, making sure not to allow anyone to pass me. And only then did I manage to win the race.
So you could say I cheated without using any cheats.
Now I havent played Toca 3 so I dont know if the last race you are referring to needs to be completed in the same manner?
I too think the above post could prove useful to others and dont know why it got such a hard reception? Not that I would personally want to use a cheat like that. I like to work out ways of beating games without using cheats or trainers.