Do this, get a Chaparral Race car 2J, the latest model not the oldest. I believe it's the 2J, whichever is most current. Tune the gearbox to about 190mph or less, supe it up to the max, and use a mid to cool personality, closer to mid driver. I smoked the competition on the deep forest track, but on cote d'azur, b-spec bob overtook 1st place on the very last lap on the 3rd turn. Keep him 3/4 away from Cold, towards Hot. Remember if B Spec Bob does well for the most part, the competition will drive awkwardly. Time your overtakes properly, and avoid spins by adding LSD if applicable.
Personality of driver
Cool----------[Right Here]---Mid-----------Hot
Personality while driving
Cool-------------Mid---[Right Here]--------Hot
If you keep him like that for the most part you should be fine. In the beginning he'll be up on hot which should be okay. But once your in second keep his personality mid to hot. My Bob beat this, level 14.
That's how my Bob won that race, the 1st place 2J was doing the same thing and Bob was able to catch up before almost hitting it himself.