Do you have a question?
Husqvarna FS 450 2017 to 2023 - FLAWLESS Quickshifter GP Retrofit
Quickshifter retrofitting for the Husqvarna FS 450 2017 to 2023
With the FLAWLESS Quickshifter GP, we retrofit the quickshifter for your Husqvarna FS 450 (model years 2017 to 2023) directly into the original ECU – for fast upshifting without the clutch, without an additional sensor and without an auxiliary control unit on the motorcycle.
This is made possible by our own custom code within the engine control unit. It works with the existing gear position sensor and utilizes the reference values already learned by the ECU. Manual reading or adjusting of these values is completely unnecessary.
The optimization remains invisible from the outside, the software number of the ECU does not change, and Husqvarna diagnostic testers can continue to be used without restriction.
Husqvarna FS 450: Standard vs. FLAWLESS Quickshifter GP
| Feature | Standard | with FLAWLESS Quickshifter GP |
|---|---|---|
| Upshifting without clutch | not possible | possible |
| Shifting from 1st to 2nd gear | – | supported |
| Additional sensor | – | not required |
| Gear position sensor reference values | learned in ECU | adopted directly, no reading necessary |
| Interruption time | – | adaptive, adjusts to every gear shift |
| Ignition restoration | – | only after gear change is fully complete |
| Additional control units on the bike | – | not required |
| ECU software number | Standard | unchanged |
Without an additional sensor – how the retrofit works
Standard quickshifter retrofits require their own shift sensor and an additional control unit on the motorcycle. Both are unnecessary with us.
Instead, our FLAWLESS Quickshifter GP utilizes the existing gear position sensor of your FS 450. The reference values for this sensor are already learned within the ECU – our custom code uses them directly. You do not need to read out anything, adjust anything, or install anything.
Closed-loop system and adaptive interruption times
Thanks to the closed-loop system of our code, the ignition is only reactivated once the gear change has been fully completed.
The interruption times adaptively adjust to the specific gear change. Systems with fixed interruption times, by contrast, restore ignition based on a rigid setting – often too early depending on the shift. We avoid exactly that, ensuring you receive consistently clean performance with every shift.
Shifting from 1st to 2nd gear
Due to our specially developed custom code, the FLAWLESS Quickshifter GP works much more precisely than comparable solutions – and even functions during the shift from 1st to 2nd gear.
How to retrofit your quickshifter
- Configure – Order the FLAWLESS Quickshifter GP for your Husqvarna FS 450 and select your desired options.
- Send in the ECU – Remove the ECU from your Husqvarna FS 450 and send it to us well-packaged and insured.
- Programming – Once received, your ECU is typically processed by our technicians within 24 hours. For shipments from Switzerland, the processing time is usually 24 to 72 hours.
- Install and ride – We will send your ECU back to you. Connect it, install it, and you're ready to go.
No additional hardware necessary
No additional control unit or sensor needs to be installed on the motorcycle for the quickshifter retrofit. Your original ECU is programmed by us. The control unit is not opened or damaged and remains unchanged from the outside.
The software number of your ECU remains unchanged, and Husqvarna diagnostic testers can continue to be used without restriction.
Why FLAWLESS Industries?
We have been developing our own software optimizations in-house for over 5 years and write every piece of code individually – we do not use purchased, off-the-shelf files.
The basis for this is created on our own high-performance simulation test bench. Each configuration is installed individually and specifically tuned during development. Our programming is therefore based on real measurement data rather than estimates or copied files.
We process well over 1000 ECUs every year. Development and programming take place entirely in Germany. If you have questions about your motorcycle, you can reach us directly – we are happy to advise you before you place your order.
Suitable for
- Husqvarna FS 450 model years 2017 to 2023
Looking for more power as well? For many models, we also offer the FLAWLESS Quickshifter GP as an option within our complete ECU Performance Flash. You can find all optimizations for your Husqvarna in our Husqvarna FS category.
Your benefits
- Quickshifter retrofit directly in the original ECU
- No additional sensor required
- No additional control unit on the motorcycle
- Uses the existing gear position sensor and its learned reference values
- No manual reading or adjustment of reference values needed
- Closed-loop system: ignition restoration only after gear change is complete
- Adaptive interruption times instead of fixed settings
- Works even when shifting from 1st to 2nd gear
- Invisible from the outside; ECU is not opened or damaged
- Software number remains unchanged; Husqvarna diagnostic testers remain fully usable
- Processing typically within 24 hours
Usage note
The FLAWLESS Quickshifter GP modifies the engine management software from the stock state. Use is permitted exclusively on closed terrain or the racetrack.
Frequently Asked Questions about the quickshifter retrofit
Do I need an additional sensor?
No. The FLAWLESS Quickshifter GP uses the existing gear position sensor of your FS 450 and the reference values already learned in the ECU. No additional sensor is installed.
Does an additional control unit need to be installed?
No. We program the quickshifter directly into your original ECU. No additional box is installed on the motorcycle.
Do I need to have the sensor reference values read out?
No. Our custom code uses the reference values already stored in the ECU directly. Manual reading or adjustment is not necessary.
What does a closed-loop system mean?
The ignition is only reactivated once the gear change has been fully completed. This prevents the ignition from being restored too early, as can occur with systems using fixed interruption times.
What are adaptive interruption times?
The duration of the ignition cut adjusts to the actual progress of each gear shift rather than following a rigid requirement. This keeps the shift quality consistently high across all gears and riding situations.
Does the quickshifter also work from 1st to 2nd gear?
Yes. Due to our specially developed custom code, the FLAWLESS Quickshifter GP functions starting from the shift from 1st to 2nd gear.
Can I continue using a diagnostic tester?
Yes. Husqvarna diagnostic testers continue to work without restriction, as the ECU's software number remains unchanged.
Does the ECU need to be opened for programming?
No. The ECU is not opened or damaged during programming. The retrofit is also unrecognizable from the outside.
How long does the processing take?
After your ECU arrives, processing is usually completed within 24 hours. For shipments from Switzerland, the processing time is typically 24 to 72 hours.
Is the retrofit suitable for all FS 450 models from 2017 to 2023?
Yes. This quickshifter retrofit is specifically intended for Husqvarna FS 450 model years 2017 to 2023.
Can I combine the quickshifter with a performance increase?
For many models, we also offer the FLAWLESS Quickshifter GP as an option within our complete FLAWLESS ECU Performance Flash, combined with performance gains, map switching, and other features. Contact us before ordering, and we will clarify what is possible for your motorcycle.