Quick Shifter's - How fast...?

What is a Quickshifter

When travelling at full throttle down the straights, in order to change up a gear, many riders will roll off the throttle, pull in the clutch, click up a gear, release the clutch and then roll the throttle back on again. Can consume about 300 to 600 milliseconds for a skilled rider.

With a Quickshifter, there is no need to touch either the clutch or throttle. All that’s needed while you are rocketing down the straight is a simple click up with the foot and the quickshifter will handle everything else for you.  where perfect upshifts performed entirely in 50 milliseconds or less

How They Work

Almost all quickshifter work on the same basis, a sensor detects the gear shift action, a microcontroller processes the data (and calculates the timing) and cuts off ignition or injection momentarily, resulting in reduction of load at the transmission allowing the new gear to slip (and engage) into its place. However the method of sensing and reducing the load can vary

When you lift up the gear lever to go up a gear, the quickshifter will reduce the load on the drive train by either momentarily cutting the ignition, or cutting the fuel in the engine (as little as 15 milliseconds).

This is enough to take the load off of the drive train so that the new gear can slip into place without any damage. This allows you to keep the throttle pinned while going up the gears.

When you push down the gear lever to go down a gear, the quickshifter will reduce the load on the drive train by autobliping the throttle for a few milliseconds (this can only be achieved in motorcycles equipped with a electronic throttle body).

This is how an aftermarket piggyback ignition cut type quickshifter system is connected

Source : https://i.stack.imgur.com/fNGDC.jpg

The same way wires with connectors are routed from the controller to the injectors too.

Source : https://www.triumphrat.net/attachments/imgp1102-jpg.658478/

Kill time Calibration table

Source : https://forum.ftecu.com/uploads/875/03PGOI0X5D5Y.png (X-axis = engine rpm Y-axis = gears), (Z-axis = kill time in milliseconds).

Kill times are calibrated accordingly with respect to riders feedback to ensure smooth rideability.

Quick shifters will be great for eking out those few extra seconds on the track, and a novelty on public roads, but really they’re all about having loads of fun changing gears faster than our human perception can comprehend.

Reference

https://lifeatlean.com/best-motorcycle-quickshifters/

https://en.wikipedia.org/wiki/Quickshifter