First off, the cars are random. So if you see the 2D at all, go out and reenter until you dont.
Second, the Toyota7 and the 2j are fine if theres only 1 of them in the line up, if both are there, same thing, out and in.
The Ferrari looks mean, but the AI doesnt drive her like we would, so nevermind them.
Third of all, pump your front brake # up to 9, and back # 8. You have to master late braking and utilize your massive torque to get in the range of the front 2 cars by lap 3. If you find yourself playing bumper car a lot, work on your braking skills by starting just a tiny bit before then normal.
Forth, you have the long track where the start line is, then the long windy track up hill, going up that hill, floor it....pedal to the metal. You WILL play bumper car on this one spot, but dont worry, the placement of the guardrails up top aim you right where you need to be. Sounds messed up but do it. That one spot times 4 laps gives you an edge ground wise as all the others brake very early in those spots.
Now, the last thing you need to get really good at is the last little guard rail on the final streach. Dont slam on the gas until the nose of the car see's a straight line through that pass, in this one spot, it is not ideal to speed up at apex UNLESS you turned late and the apex actually IS at a straight line through, just dont slam on the gas while your still turning.
The GT hates going slow, you will notice this as the car almost yells at you when you hit the gas again after you almost came to a complete stop. So try not to. Utilise turning while coasting, while letting the actual mph and rev meter not get too too far low. I tuned it so it would turn very well in low speed corners, lol, or tried to anyway^^
Let me know how it goes.