In the GT6 drag leaderboards.
I doubt you'll find it in a YouTube video, as it's certainly not common knowledge.
Drag folk are extremely sensitive about releasing transmission info they've discovered through the test track created for the leaderboard.
And tbh, how it corresponds to other tracks is open for debate....but it stands to reason that the principals remain the same.
Many cars launch harder when held in 1st to around 40mph.
This technique also allows us to run a much wider second gear... In many instances second gear is full left on the slider.
Doing this drastically decreases shift lag and increases overall pull through the higher gears.
There are also many other settings that can drastically increase a cars launch.
Even most drag folk don't know about.
Also, in my experience standing start launch techniques flow over to all forms of racing in GT6.
It's kind of like a boost launch in Mario karts.
As for proof of my claims....
I can only point you to the leaderboards I guess.
My PSN is Neck-it.
40 mph instead of taller or shorter 1st? With a shorter 1st gear you get a lot of wheelspin in the more powerful cars, so even if you have a billion torques at the wheel, the tyres are only able to convert a fraction of it to a frictional force that accelerates the car.
As the game operates at a framerate, in theory an ideal gearbox would be omptimized by the number of frames required to shift gear. For instance, reducing the theoretical shift time from 5.1/60th of a second (6 frames in the game) to 4.9/60th of a second (5 frames in the game) reduces the shift time by 1 frame (1/60th of a second), while reducing the theoretical shift time from 5.9/60th of a second (6 frames) to 5.1/60th of a second (6 frames) doesn't have any effect.
For instance, say that you have the following theoretical shift times, determined by the gap between the gears:
1 to 2: 7.2/60 seconds (8 frames)
2 to 3: 6.5/60 seconds (7 frames)
3 to 4: 5.5/60 seconds (6 frames)
4 to 5: 5.2/60 seconds (6 frames)
5 to 6: 4.8/60 seconds (5 frames)
Total theoretical shift time: 29.2/60th of a second
Total shift time locked by framerate: 32/60th of a second
Seconds lost due to framerate: 2.8/60, or 0.047 seconds
An optimal configuration:
1 to 2: 6.9/60 seconds (7 frames)
2 to 3: 6.9/60 seconds (7 frames)
3 to 4: 4.9/60 seconds (5 frames)
4 to 5: 4.9/60 seconds (5 frames)
5 to 6: 4.9/60 seconds (5 frames)
Total theoretical shift time: 28.5/60th of a second
Total shift time locked by framerate: 29/60th of a second
Seconds lost due to framerate: 0.5/60, or 0.008 seconds
It would take a lot of work to calculate the theoretical shift time though and to optimize the gearbox to the framerate, but if every millisecond counts...