| From my experience and knowledge Ok, we all know that we have to push the clutch in to shift. This is to slow the engine down to the speed the next gear is "traveling". And do to the marvel invention of synchros, we only have to push the clutch in once. Back in the day before sychros, it was often nessesary to "double clutch". Purpose being, when the clutch was pressed in, the RPM dropped below the speed of the next gear. It was nessesary to release the clutch to allow the engine to speed itself back up again to a more "nominal" RPM, then you would push the clutch in again, and be able to catch the next gear at the correct speed. Speed shifting is when you are able to be a the precise RPM the next gear is traveling when you shift. In other words, there is no clutch involved in the process. At a certain RPM, you are able to pull the tranny out of gear and into the next one at the correct and perfect speed that next gear is traveling. This does not always mean that you can shift faster without the clutch. Sometimes you can, but it is all a game of russian ruelet. I knew a guy that could do it every time that he tried. Never grinded the gears or anything. It all boils down to knowing the car and the gear ratios and there rate of travel. thats it
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