Watching the demonstration lap can be very helpful, there you can see the racing line, breaking points and how much throttle and brake you can apply on specific corners. It's the closest we can get to a telemetry.
From the top of my mind, I can remember that the Porsche RSR is very good at taking corners, you can carry more speed than you think. For reference, there is a map of the circuit at the end of my reply, here is my guided lap:
Coming from the start/finish line, break down to 2nd gear righ before the 100 m board to take turn 1, you can do it in 1st gear, but 2nd gear keeps the car more stable. Go deep on the right side at the entrance and left side at the exit of the corner, the track is very wide in this section, so use it to your advantage.
Eau Rouge can be taken with gentle throttle lift at around 240 km/h, you don't have to break. By doing it, you can carry a lot of speed through Radillion and the Kemmel Straight.
For turn 5, you can break hard at the 100m board, go down to 3rd gear and hold your speed through turns 5 and 6. After turn 6 you can get a little more speed to do turn 7, which can be done in 4th gear.
After turn 7 you will go full throttle downhill, break hard at the 100m board down to 2nd gear, Bruxelles is a long corner, you have to be patient and keep the inside line.
Following Bruxelles is a small straight, you can go to 4th gear there, and than break to 3rd gear to take turn 9. Use the curbs on the right side while exiting the corner.
Turn 9 ends on a long straight, take it with open throttle all the way to 6th gear, right before the 50 meter board break hard to 4th gear. After the first apex, at turn 10, you have speed and downforce enough to go full thottle through the second apex, at turn 11. You have to be careful with the racing line and weight transfer of the car, Double Gauche is a challenging sector.
Turns 12, 13 and 14 are like a scaled up version of turns 5, 6 and 7. Right before the 50m board break to 3rd gear to take turn 12. You can accelerate and gain more speed in the middle of turn 12, and take turn 13 in 4th gear, use the curbs (right side) on the exit.
Turn 14 can be taken in 3rd gear, use a lot of the curbs in this section. Paul Frère can be done with a very short throttle lift, be careful not to atack the left side curbs exiting turn 15, they can make the car unstable and ruin your lap.
Go flatout through turn 16. Blanchimont is another challenging turn, you are at very high speeds coming to it, about 280 km/h. You don't have to break to take this corner, it's all about the racing line, a throttle lift is enough. Turn 17 can be done at 260 km/h.
There is a chicane at the end of the lap, coming full throtlle from turn 17, break hard between the 150 m and the 100 m boards, down to 2nd gear to take the right hander. Go deep on the right side curb. Reduce to 1st gear to take the left hander, use the right side curb exiting the corner, be gentle with the throttle to not spin around and you're done!
That's all I can remember, this is one of my favorite tracks! As I said before, watch the demonstration lap for a full understanding, enjoy it!
