Then, by driving the crankshaft the rear wheel can cause the engine to over-rev by pushing it through its redline, risking damage. Also, the forces jerking on the chain as it tries to turn the engine upset the suspension and place undue stress on the tyres, which must fight resistance from the engine as well as grip the tarmac. As you decelerate and downshift, resistance can become too much for the rear tyre to cope with (especially under hard braking or in the wet when traction is poor), so the wheel hops and at worst locks up. On a high compression engine, the crankshaft must fight the trapped compression inside the combustion chamber during the combustion stroke to push the piston back up, and this produces resistance in the form of engine braking, or 'back torque'. While the likes of Rossi could mash down the gears on their 500cc GP two-strokes and fly into corners without a twitch from the bike, it's a different story on the new generation four-stroke MotoGP bikes. What's more important going flat out straight or hammering through the corners! The quickshifter combined with the slipper clutch mod, and my bike feels like a RACE BIKE! Understanding Quickshifters and Slipper Clutches - Workshop - Visordown Oh, and a constant throttle is also more fuel efficient, marginally! As well as saving time, it won't unsettle the suspension and the bike will be more stable, especially in a corner. The secret lies in interrupting the engine faster than is humanly possible to operate the throttle so time spent shifting gear plummets typically to between 15 and 50 milliseconds - that's quick. These gadgets kill the engine momentarily, taking the load off the gearbox to let you shift up the gears without backing off the throttle. Yep ANY bike will upshift with no clutch, you only need a quick shifter for full throttle upshifts. ![]() Slipper clutches are very handy for over enthusiastic riders going down box, you can easily lock up going down box, once set up to ramp you can never go wrong. I'd say the slipper clutch will only be beneficial on the track. Even clutchless change-ups take on average 300 milliseconds for a skilled rider to perform - yep, that's a lot.īasically a slipper clutch stops the back wheel locking up when going down the gears for a corner, I.e 4 to 2 and keeps the bike a lot more stable and no hopping etc. This keeps the system from activating at too low of an rpm, such as low speed road riding.įor using the Quick Shifter you need the shift rod(s) Typ A and 2 x Typ C.ĭynojet Quick Shifter No.Problem is by the time the rider has pulled in the clutch, rolled off the throttle, changed gear and rolled the throttle back on not only a fuel injected bike will they have lost time but the bike will pitch and dive, upsetting handling, suspension and geometry. The user can also set a minimum rpm for the system to function. The amount of "kill time" is adjustable by the user via the provided software. ![]() No cutting or splicing of your bike's wiring harness is necessary. The Power Commander incorporates all of the Quick Shifter functionality in with the main fuel controller and is fully programmable. During this time, the rider can shift up to the next gear without rolling off the throttle or using the clutch. This is done by momentarily cutting the fuel and or ignition, which unloads the transmission. ![]() The Dynojet Quick Shifter (DQS) allows full throttle, clutch less shifting. ![]() Rolling off the throttle, even slightly, slows your times and can be the difference between winning and losing. It was called Gear Shift Assist and it was clunky, to say the least, but it did work. In racing (both drag and road race), split seconds count. So step forward a year and the first proper production motorcycle with a quick gearshifter was BMW’s K1300s back in 2010. Normally during "up shifting" you must roll off of the throttle and pull in the clutch in order to engage the next higher gear.
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