I did what I wanted to do yesterday, but had to grind all day first to afford the car.
Anyway, my first attempt at 3h endurance race in the Sauber C9 was epic
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I made plenty mistakes, getting used to the car in varying conditions. It's not my favorite GR.C car but is still better than everything else in the campaign

One thing to note is, it doesn't like medium speed corners, very hard to turn.
The VGTs are hard to catch, XJR-9 is the runt of the litter
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And for 3.5 hours of my time, setting it up and completing the race
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That's the weather program I used, gonna refine it a bit more for next attempt.
I had it set up wrong, forgot to add time compression so it was 3h real time, no night. But the race finished while the sun was getting low, so was very pretty.
The AI drives by different rules. They can do 5 laps on softs, that up there is my 3rd lap on softs... While having to fuel save last lap as the lap indicator lies as usual (left with 3.5 laps indicated, had to short shift and go to map 3 in the final lap to make it). The AI doesn't have the foresight to change tires while weather is approaching on the radar, and drives very slow when caught in the rain. Yet after they get rain tires on, they are much faster than you can be on the same tires. They seem to have a lot more grip, but do spin out regularly.
Intermediate tires are good up to 210 kph when the rain meter nudges up to the 3rd segment. It never seems to go higher then a little blue line into the 3rd segment (in torrential rain) but when you hit 220 kph on intermediate tires in that state it's instant aquaplaning. On heavy wets you can go full speed, but they feel less grippy, more prone to snap oversteer compared to intermediates with the same rain conditions. Intermediates better cornering but capped top speed.
Epic race, next time with full day/night cycle and more variation in weather. R01 doesn't seem to do anything for example, just looks boring. I also don't know how to get more random rain. I got a bit at the start with varied rain but then it turned into solid lines again, on/off. First time I tried in GR.3 with all random weather, I didn't get a single drop of rain. It would be nice to have more control over the weather and a weather radar that extends further than about a minute and a half before it hits you.