The general consensus on the internet seems to be that quick-shifting can be less harmful for the gearbox than slow-shifting since the engine power is guaranteed to be lowered when the fuel/ignition are cut. Is Quick-Shifting Harmful for the Gearbox? In this case you have one cable for each sparkplug which suggests that this unit cuts the ignition when quick-shifting. It looks something like this:Ī quick-shifter circuit typically looks like this: The quick-shifter is usually a sensor reading the position of the shifter, informing a microcontroller of when up-shifting takes place in order for the controller to cut the fuel/ignition. Just to give you an idea of how fast a quick-shifter can operate, see this video of a quick-shifting ZX10. All of this happens without the need to close the throttle. The way this is done is usually by momentarily cutting fuel and/or ignition for a few tens of milliseconds during which the gear is engaged. There are many types of quick-shifters out there and not all use the same methods although they all aim at achieving a common goal: reduce load on the drive-train to safely engage a higher gear without damaging the gearbox. Now, this is a time-consuming process ( a few hundreds of milliseconds) which might be undesirable in a racing environment where every fraction of a second counts. When you slow-shift you usually close the throttle, disengage the clutch, act on the gear shifting pedal, engage the clutch and reopen the throttle. Since these are called quick-shifters we'll dub slow-shifting the traditional way of shifting gear.
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