In order to do that you have to enter the RPM stage where you can shift without a clutch. Otherwise you can just rip off everything you got. So you have to hear the moment. But if you trained good enough, you can shift real fast with the clutch. My legs are trained. So i dont get a burnout while getting to the second
My grandpa back in russia used to make money by helping road drivers with bad tranny to get home. He could switch gears without clutch. And he was getting good tips