sevtixQS

Directly integrated into the Keihin ECU firmware

Overview:

The whole functionality relies on stock gear (drum) position sensor.
The software is comparing the live sensor values against the calibrated values multiple times per crank revolution and decides whether to reduce torque or keep the engine running normally.
Precise gear definitions allowing very low engagement force to minimize gearbox and shift fork wear.
In order to enable smooth shifting with the clutch, the QS is inactive below the configured TPS threshold.

The software was tested on multiple bikes for several thousands of kilometers in total. All that without showing any additional wear

The additional software was entirely created from scratch
No parts were copied or reused from the 2023+ KTM software!
This is to ensure the QS is working reliable and exactly as specified.


Videos:


Re-/Calibration:

The latest QS update includes simplified gear calibration without the need for a computer or tools.
The kill switch and check engine light are being temporarily repurposed to provide a simple interface.
Configuring a gear-position-based quickshifter has never been easier!

This is especially important after an engine rebuild or to compensate sensor drift

Features & Pros:

Shift as fast as safely possible:

Fast configuration
No interference when shifting with clutch
Very low engagement force
No false neutrals
Functionality is toggleable
No time-based configuration
No additional hardware or aftermarket ecu neccessary
Failsafe in case gear sensor unplugged / failed

Working principle:

Ignition retard

This approach retards the ignition timing so far that no torque on the gearbox is being generated.
A dedicated ignition map calulcated the amount of ignition retard necessary to ensure a clean and smooth power interruption in partial and full load

Modes:

Shift up

In this mode quickshifter is only working while upshifting.
Upshifting is possible in each gear from tps threshold up to full load

Shift up & down

In this mode quickshifter is working while upshifting AND downshifting.
The downshift is possible from light load up to full load.

A dedicated overrev protection is not implemented!

Photos:

Stock engine without additional hardware

No additional hardware

Original QS is not neccessary

Toggle custom / stock qs

Custom qs configuration

Configure QS (tps threshold, gear ranges and more)


Compatibility & requirements:

In general this modification is possible to all 4 stroke KTM/Husqvarna and GasGas competition bikes using the gear position sensor.
Due to transmission differences, different variants of the QS are used and the shift speed/precision may vary.

Perfectly working and precise gear position sensor & gearbox are absolutely mandatory for the best results.

Subject to errors and changes