I'm happy to share my first tune, just finished the endurance mission on Alsace with the good old Ferrari 308 GTB at 450pp.
At the beginning of the game, I overtuned this car a lot which made it not drivable, I thought I would never use it again, but I tried my best to make it fit on this event, and it actually did well.
Best lap at 2:26.067, average lap at 2:28, 24 laps, 2 stops (every 20 minutes), best AI was the 300 SL 53 seconds behind.
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You don't need to tune up all the engine parts like I did, just set everything else "as is", and then tweak ECU/power restrictor to match the 450pp.
Also, I kept the spoiler and wing just for style, but you can remove it to save some pp that you can use to power up the car or lighten the ballast.
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About transmission, set it to 200 km/h and then raise the "final" offset so that 5th gears reaches the max speed for the car on that track (182 Km/h). You don't need to touch the 1 to 5 gears, just set max speed to 200 and adjust "final" to reach around 182 for 5th gear.
Oh yeah, I also have a wide body on that car and wide rims + wide offset.
Also that car is very nice to drive at that performance level, there has been some turns where I was very late, and you can always manage to keep it safe, losing some time of course, but not hitting a wall or spinning out that could ruin the race.
If you use it, please give your best lap time, I'm a rookie I wonder how low it could go.
P. S. Just forgot to tell that I used fuel map 1 all along (that's usually the case when not mentioned I suppose)