A quick shifter, also known as a quickshifter or quickshift system, is a device or feature found on some motorcycles that allows for seamless and clutchless upshifting during acceleration. It enhances the rider's experience by making gear changes faster, smoother, and more convenient.
Here's how a quick shifter typically works:
Upshifting without the clutch: Normally, when shifting gears on a motorcycle, the rider needs to disengage the clutch by pulling the clutch lever. However, with a quick shifter, the rider can shift gears without using the clutch lever during upshifts. This feature is particularly useful during high-speed or aggressive riding, as it eliminates the need to manually coordinate the throttle, clutch, and gear shift lever.
Interrupting ignition or fuel supply: The quick shifter works by momentarily cutting the ignition or fuel supply to the engine when an upshift is detected. This brief interruption in power allows for a smooth engagement of the next gear without needing to back off the throttle or use the clutch.
Sensor and ECU integration: The quick shifter system typically includes a sensor near the gear shift lever that detects upward movement or pressure on the lever. This sensor sends a signal to the engine control unit (ECU), which then initiates the ignition or fuel cutoff for the specified duration. The ECU ensures that the quick shifter engages only when the throttle position and engine speed are within the predefined parameters.
Benefits of using a quick shifter include:
Faster gear changes: With a quick shifter, gear shifts can be executed without rolling off the throttle or using the clutch, allowing for lightning-fast upshifts.
Smooth and consistent shifts: The quick shifter's precise timing and seamless ignition or fuel cutoff result in smooth gear changes, reducing the chances of driveline shock or instability.
Improved rider focus: By eliminating the need to coordinate the clutch and throttle during upshifts, a quick shifter enables the rider to maintain better control and focus on other aspects of riding, such as braking and cornering.
It's important to note that quick shifters are not available on all motorcycles and may be found primarily on sport bikes and high-performance motorcycles. Additionally, some quick shifter systems are designed for both upshifts and downshifts, allowing for smoother clutchless downshifting as well.