I tried to tune my tuned Ford GT '06 for the WTC 600, but even when I uninstalled every part I could - and minimized the power while maximizing the ballast - I still could simply not get it below 600PP. So I think if I want to use a Ford for that event, I'd be tuning a Mustang GT '15 instead. I already used a tuned BMW M3 (E92) for the WTC 600 race at Spa-Francorchamps, too. And who knows, maybe a tuned Mustang GT '15 will end up being eligible for the Kyoto Driving Park One Hour, too. Or I could just stick with the BMW, haha! I love the sound of it, it's vicious!
A personal issue that I'm running into is that I'm favoriting too many cars that would comply to hypothetical regulations that don't even appear in World Circuits events, let alone Sport Mode. These regulations aren't even options in Lobbies, so I think I'm just making a mountain over a molehill.
I mean, for the Kyoto Driving Park One Hour, I'm thinking of taking a closer look at the cars I can expect to be typical opponents, then try to get (and likely tune) a car insofar that it has similar power/weight. For example, the "poster" for this event partially features an Alfa Romeo 8C Competizione, which has 442 HP and over 550PP, though I could see it be eligible with relatively minor changes to the power/weight settings. Meanwhile, my heavily-tuned Ford Focus ST '15 is incredibly close to 550PP, but as far as I can remember, it doesn't even have 300 HP! Even the GR Supra '19 - which has nearly 50 less HP than the 2020 model - has over 330 HP, with 536PP.
My impression is that the 550PP regulation is specifically ideal for cars that are almost at that metric as-stock, rather than requiring extensive tuning to get up there. But then again, my Focus ST '15 is also a lot lighter than the other cars I've tuned to similar PP, and the Kyoto Driving Park does seem awfully curvy. So I suppose my curiosity is really eating at me. I wanna see if I can really get P1 in the Kyoto Driving Park One Hour in that 2015 Ford Focus.
If I can't do it, then my next plan is to attempt using a Ferrari 458 that's had some minor changes to power/weight, but is otherwise entirely stock. Despite coming in at 614 PP as stock, I think a lot of its PP is due to the tires it comes on. Either way, when I equip the hardest compounds that this endurance permits - and if I play with the power and ballast a bit - then I'm really able to get under 550 PP. Besides, I plan to minimize pitting for this endurance, at any rate.
Say, I just had another idea. What if I could use the Ferrari 308 GTB for both endurances - or perhaps my Mustang Mach 1 '71? I think I'm going to tinker with the tuning for both cars, and see what happens.
EDIT: So I tried using my tuned Ford Focus ST '15 for the WTC 600 round at the Nurburgring GP, and then I tried using my tuned BMW M3 (E92). (Note: the Focus ST '15 can indeed reach 600PP!) Both times, I came in third, and was under ten seconds behind the leader, haha! So I'm thinking it's more that this is simply a tough event, rather than my car being inadequate. What's also interesting, is that I played around with my Ford Mustang Mach 1 '71, and it turns out it can get near 450, 550, and 600 PP, respectively making it a potential candidate for the Alsace One Hour, the Kyoto Driving Park One Hour, and even the WTC 600! Definitely gonna try using this Mustang at the Nurburgring GP, next, to see if it can win it.
I might try using the Focus ST '15 again, too, if only because I really do like the way it drives. Perhaps I'll consider adding some more weight, so that I can also add more power. Actually, I don't even know if that'll change much, and I do like being able to accelerate/brake a bit faster. As it stands, I think it's got 293 HP, and it's on Sports Softs, so I think I'll experiment a bit by putting on Sports Hards, and seeing how much I can raise the power.
