SpeedFun Furious Ultra for Specialized Gen4, 3.1 motor

This Speedfun tuning kit removes the 16mph (25km/h) speed limit, allowing the motor to help you at higher speeds. With the speed limit removed, 28-37mph (~45-60km/h) can be expected, depending on the bicycle and gearing.

The tuning kit manipulates the speed signal without altering the motor's power relative to pedaling speed. This guarantees a smooth motor control without speed limit interruptions. Depending on a tuning kit, some determine when assistance stops, while others remove the restriction entirely for continuous support. However, the achievable speed mostly depends on the eBike model. Achievable speed can be calculated using a simple formula:

Speed = Cadence [rpm] * Wheel circumference [mm] * Front Chainring Teeth / Rear Chainring Teeth * 60 [min/h] / 1.000.000 [mm/km]

The function of the Furious Ultra tuning device for Specialized 3.1 motor (Turbo Levo gen4) is to electronically manipulate the rotation speed of the rear wheel and to communicate to the motor a speed always lower than 25 KmH in order to obtain a real speed with very high active motor. The maximum speed limit will therefore be dictated by the power of the engine added to the power expressed by one’s legs.

When the tuning device is active, having no communication with the display, it will show the halved data on any display (or app) starting from a certain threshold.

This tuning kit can be installed on Specialized Turbo Levo (gen4) equipped with Specialized 3.1 motor and MasterMind T3.

Furious Evo Ultra devices offer a choice of operating modes:
– Always active, cannot be deactivated
– Activated/deactivated by pedaling with the wheel lifted
– If tuning was active before turning off, it will also be active after turning it back on.
– If tuning was active before turning off, it will be deactivated after turning it back on.
– Tuning can be activated/deactivated with an external button (not included in the kit).
For more information, see the instructions on the page.
The device is supplied plug and go ready to use and is installed in a very simple way thanks to the compatible connectors with which no physical modification of the ebike is necessary.

WARNING!
This device is not compatible with Specialized Gen1, Gen2, or Gen3 e-bikes equipped with TCU01 (blue LED), TCU01 (Mastermind), or TCD. This device is not compatible with Specialized ebikes equipped with motor-controlled electronic shifting.

ACTIVATION/DEACTIVATION - PEDAL SYSTEM
- Place the chain in the highest gear (the smallest rear sprocket).
- Place the left pedal at 11 o'clock.
- Lift the rear wheel and apply a strong pedal stroke (just one, with your foot). Let the wheel spin above 30 km/h for a few seconds.

The system recognizes acceleration and considers it as a command to activate or deactivate (cyclically) the speed release. When activated, the display shows the speed changing from real to halved. When deactivated, the display shows the speed changing from halved to real, and the bike returns as original.

This Speedfun tuning kit is made to work with Specialized 3.1 motor ONLY with any combination with all available displays and the Speacialized application.

Specialized ebike with 3.1 motor where the Furious Ultra device was successfully installed (this list is illustrative and not exhaustive)

– Specialized S-Works Turbo Levo 4 LTD
– Specialized S-Works Turbo Levo 4
– Specialized Turbo Levo 4 Pro
– Specialized Turbo Levo 4 Expert
– Specialized Turbo Levo 4 Comp
– Specialized Turbo Levo 4 Comp Alloy
– Specialized Turbo Levo 4 Alloy

When connecting Tuning Kit to an e-bike you will find connectors colored to make installation very simple. We have prepared detailed instructions and videos to make installation easy for you. Disassembly of our tuning kit is just as easy. If you have any troubles with installation or disassembly, do not hesitate to contact us.

If you are planning to install Speedfun on a brand-new bike, make sure you ride it for at least 0.6 miles (1 km) before the tuning kit is activated.

Please note that the operation of this type of modified electric bikes on public roads may be against the law in some countries. The manufacturer takes no responsibility for damages resulting from the use of Speedfun products. Electric bikes equipped with Speedfun products are not allowed to be used on public roads, cycling paths and public places. Electric bikes equipped with Speedfun products can be used exclusively on private property and entirely at one’s own risk. The use of Speedfun products may void the warranty of your ebike.

We strongly recommend using other safety features and protective gear to prevent injuries in higher speeds.

Speedfun products are thoroughly tested and we stand by their quality - Speedfun provides 2 years warranty to all their products.

Warranty does not cover damage resulting from eBike software updates. Remove the tuning kit before updating the software. Check with us first to ensure the kit is compatible with your updated eBike. We cannot guarantee that the kit will function the same after updates. Please exercise caution.