SpeedFun Furious Ultra is an e-bike tuning device that allows you to remove the 25 km/h speed limit, fully exploiting the potential of the Specialized 3.1 motor.
This speed release device is specifically designed for Specialized Turbo Levo Gen4 e-bikes equipped with the Specialized 3.1 motor and MasterMind T3 display.
All SpeedFun Furious Ultra speed release devices can be activated or deactivated as desired.
What is the SpeedFun Furious Ultra e-bike tuning device for Specialized 3.1 motors (Turbo Levo Gen4)?
The function of the Furious Ultra tuning device for Specialized 3.1 motors (Turbo Levo Gen4) is to electronically manipulate the rotational speed of the rear wheel and to always set the motor to a speed lower than 25 km/h, thus achieving a very high actual speed with the motor active. The maximum speed limit will therefore be dictated by the motor power added to the power expressed by the rider's legs (info).
When the tuning device is active, as it does not communicate with the display, it will show half the data on any display (or app) starting from a certain threshold.
This tuning kit is compatible with Specialized Turbo Levo (gen 4) ebikes equipped with the Specialized 3.1 motor and MasterMind T3.
For Furious Evo Ultra devices, you can choose the operating mode:
– Always active, not deactivatable
– 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 for use. Installation is very simple thanks to compatible connectors, which do not require any physical modifications to the ebike.
ATTENTION!
This device is not compatible with Specialized Gen1, Gen2, or Gen3 ebikes equipped with TCU01 (blue LED), TCU01 (Mastermind), or TCD.
This device is not compatible with Specialized ebikes equipped with motor-controlled electronic shifting.
INSTRUCTIONS: https://www.speedfun.bike/wp-content/uploads/2025/09/Istruzioni-FURIOUS-ULTRA-SPECIALIZED-3.1-IT-EN-FR_compressed.pdf
