Fascinating footwell video of a V8 Supercar lap. The car has an ignition cutout on the upshift so the foot stays flat on the accelerator during the gear change. The heel and toe (clutch in and engine blip) is something you will not see in pretty much any racing series now, but they wanted it to stay in Supercars.
Since around 2007 they pioneered 'seamless shifting' in F1, wherein - using some very trick arithmetic - two gears momentarily engage at the same time, so the next gear is 'queued' in milliseconds and the driveline simply keeps going with no interruption.
Here's Fernando Alonso having a go in a Supercar in 2022 at Albert Park, like he's never known anything else. I don't think he even blinks.
https://youtu.be/1f5QlfrODu8
There's a thing at Ferrari's site about it here: https://www.ferrari.com/en-EN/magazine/articles/great-ferrari-innovations-the-f1-semi-automatic-gearbox
@tk Yeah, most of the kits you can get do exactly that. I helped a friend sort out the timing on his Kawi (you had to manually adjust the cut).
@tk I think you need a gearbox with a fairly short throw, so many cars with H-pattern I think it would be too difficult to time. So many of them with semi-auto or DCT now anyway.
@tk Motorcycles with the non synchromesh gears move a very small amount, it's such a great and simple design that allows all these things.
Since pioneered in the 1989 Ferrari this is usually done by computer now; the transmission forks and throttle are moved by an actuator, the whole thing is coordinated by a computer. The driver changes gear via paddles behind the steering wheel.