I found out that RaceChrono has a mode that allows you to log data from Assetto Corsa
(RaceChrono can't stop amazing me), so I couldn't help but log some data.
I did a few laps at Laguna Seca in the '13-'16 GT86 that comes with in the game.
According to my calculations, the built-in torque curve produced ~167 wheel hp,
which is typical for these cars irl.
Car setup:
- -1.7º camber all around (tweaked the car config to allow such camber adjustments)
- 0 toe front, 0.1 toe rear per side
- Street tires
- TC off
- Otherwise default
- Track conditions: "Ideal"
My opt lap in the GT86 was 1:48.63
Then I also did a few laps in the same car with the same setup, but with
the torque curve from
the earlier post (~197 wheel hp, matches what Toyota folks say).
My opt lap in the "GR 86" was 1:46.05
I can certainly polish my laps slightly, but I don't think I can
easily shave off more than a few tenths from these opt laps.
Here's the comparison between speed traces of the best laps in each car:
If you trust such a testing approach, looks like we'll be
seeing 4–5 mph of difference at the end of longer straights,
and ~2.5s of difference per lap at Laguna Seca.
It's important to note that my 1:48.63 lap in the GT86 is over
2 seconds faster than the 86DC Stock class record (1:50.78).
This can be explained by many factors, such as:
- The virtual model of the track is different (fewer bumps?)
- The virtual track had "ideal conditions"
- The virtual Street tires generate more grip than GT Radial SX2
As another data point, I'm seeing corner speeds in the sim 1–2 mph
higher than my car does irl in the 86DC Street class.
(wider tires than 86DC Stock, coilovers)
Having said that, I think the "4–5 mph speed, 2.5s per lap" difference
is the right ballpark.