Hi,
My humble conclusion about this series is that you need very short gears ratios, and a light weight; because AIs have the chance to dose their gas throttle in the turns whereas you can't, you may need to power slide, and have a giant acceleration capacity to compensate the loss of speed in the bends.
I also think that N.A. engines are best fitted for this, thanks to early available & more linear torque and the fact it's easier not to spin out with it.
I've won this series 6 or 7 times, with fully tuned/soft slicks:
- RT/10
- 96' Corvette
- Cerbera
- Griffith 500
- NSX Type S zero
Never won with 900hp (but much heavier) cars
For Autumn Ring II, final gear ratio must be adjusted to shortest possible, 5th or 6th gear must shift at 180 or 190 km/h (118 mp/h). Top speed is useless I think for this track, whereas powering out capacity is needed. For other tracks, max speed of 300 km/h (188 mp/h) is enough. I tune this point finely for each track with the final ratio too.
I also must admit that sometimes there's some AI bashing from my side, and some wall riding... I just can't win if I (try to) drive too clean
Here is a file where I recorded my settings for 4 of the 5 cars above, I forgot to save the NSX ones.
One of these days, I'll try to beat this with an FF N.A. car, Prelude or something like this, but I'm not sure it'll be enough...

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