Speed Master 4 Ultra:Tuning Kit for Xiaomi 4 Ultra Electric Scooter

Speed Master 4 Ultra: Advanced Tuning Kit for Xiaomi 4 Ultra Electric Scooter

Key Features:

Full System Replacement
Upgrades both the controller and display for a complete performance overhaul
Speed Limit Removal
Unlock speeds well beyond the factory 20 km/h cap, reaching up to 40 km/h, depending on terrain, rider weight, and battery condition.
+30% Acceleration Boost
Fully utilize the 940W peak motor for faster takeoffs, smoother throttle response, and better torque delivery.
Improved Climbing Power
Enhanced motor control provides significantly better uphill performance and hill starts.
Customizable Speed Settings
Set or adjust your speed cap (e.g., 20 km/h, 25 km/h, 40 km/h) anytime through the controller or companion app.
Smarter, Smoother Control
Enjoy more responsive handling and optimized ride feel thanks to advanced hardware integration.

Precision Control Features

Cruise Control Mode – after 10 seconds of consistent throttle, the scooter maintains the current speed automatically. Cruise cancels upon throttle or brake input.
One-Touch Tuning Toggle – activate or deactivate tuning by holding the brake and power button for 2 seconds, or toggle via the SpeedMaster 365 app (available on Google Play; iOS version coming soon).
Password Protection – create a 4-digit PIN to block unauthorized tuning access. An optional secondary password is available for multi-user setups.
Adjustable Kickstart Mode – choose between non-zero start (kickstart like a traditional scooter) or throttle-based launch.

Easy Installation
Installation is straightforward — simply replace the original controller and display with the included SpeedMaster components. The package comes complete with:
Performance controller
Advanced display unit
Adapter cables and connectors

No soldering required, and no special tools necessary. With basic mechanical skills and patience, most users can complete the upgrade themselves. A step-by-step installation video and written instructions are included.
Click to open the tutorial: Installation

App Integration
Pair your kit with the SpeedMaster 365 app for advanced settings and real-time monitoring. Via the app, you can:
Adjust speed limits
Set motor pole pairs and wheel diameter
Switch between battery configurations (10S or 12S)
Monitor live data and diagnose errors
For optimal performance and correct speed display, accurate settings (e.g., tire diameter, motor poles, tire pressure, and battery status) must be entered during setup.

Self-Learning Motor Calibration (Required)

The SpeedMaster V4 controller includes a motor auto-learning process to ensure compatibility with your scooter’s motor specs.
To initiate self-learning:
1. Make sure the scooter is powered off and placed on a flat, stable surface.
2. Hold the power button for about 10 seconds.
3. The wheel will spin slowly forward, then backward.
4. A “beep” sound indicates successful calibration.

Technical Details

Compatible model: Xiaomi Electric Scooter 4 Ultra (also known as Xiaomi 4 Ultra)
Battery support: 10S (36–42V) and 12S (43.2–50.4V) lithium batteries
Motor config: Default 14 pole pairs (28 poles); configurable via app
Material: ABS+electronic components
Product Weight: 300g
Package Weight: 400g
Package size: 15 x 10 x 4 cm
Packing: Graphic Carton
Ages: 16+