Why Xiaomi’s Factory Limits Are Hindering Speed
Xiaomi scooters are among the most popular in the world due to the balance of price, quality and technical characteristics. M365 The Pro or Mi Electric Scooter 4 Pro have factory speed limits of 25-30 km/h depending on the region. These limits are laid not only because of the legal regulations (in the EU and Russia, the maximum allowed speed for scooters is 25 km / h), but also to protect the battery, controller and engine from overloads.
But what if you need more? You may be driving on closed tracks, competing, or just wanting to get your adrenaline. In this article, we'll look at 7 proven ways to speed up Xiaomi's scooter, from software tuning to iron upgrades. Importantly, each method has its own risks, and some of them can take you out of warranty or cause your battery to burn if you don't do it correctly. So before you start, assess your technical skills and preparedness for the consequences.
1. Controller firmware: the most popular way to overclock
Flip-flashing ESC-Electronic Speed Controller is the first step that Xiaomi owners take M365, The Pro 2 and other models are factory firmware that limits top speed, engine current and power, but alternative versions (such as the Custom Firmware from the ScooterHacking community) allow these restrictions to be removed.
The firmware will require:
- 🔧 Screwdriver for disassembling a scooter (usually Torx) T20).
- 💻 Windows or Linux computer (MacOS is not supported by most tools).
- 🔌 ST-Link cable V2 or USB-TTL plug-in.
- 📁 Firmware for your model (for example, CFW for M365 or DRV for Pro 2).
Step-by-step:
- Remove the bottom cover of the scooter and find the controller (usually it is hidden under the heat pad).
- Connect the ST-Link to the connector SWD on board (pins) GND, SWCLK, SWDIO, 3.3V).
- Run the program. STM32 Flash Loader or ScooterHacking Utility.
- Select a firmware file (.bin) and wait for the recording to be completed (usually 2-5 minutes).
⚠️ Attention: Incorrect firmware can "brick" the controller. If the scooter does not turn on after the update, you will need a soldering iron and experience with chips to restore through Bootloader.
Disconnect the scooter from charging|Download the firmware from the official repository|Check the compatibility of the controller version|Prepare a spare battery in case of failure-->
Modifications BMS: voltage
BMS (Battery Management System is the battery's brain that controls charge/discharge, temperature and protects against short circuit. BMS It limits the maximum discharge current, which directly affects the speed. BMS This allows you to increase this parameter, but requires a deep knowledge of electrical engineering.
Modification methods:
- 🔋 Replacement of resistors on the board BMS (for example, R13 and R14 into M365 responsible for limiting current).
- 🔌 Firmware BMS through UART-Port (less often, as not all models support this).
- 🔄 Installation of the exterior BMS with higher thresholds (e.g. for lithium-ion batteries) 20S 40A).
Example of modification for Xiaomi M365:
// The parameters of the original BMS:
Max Discharge Current: 18A
Max Charge Current: 3A
// After modification (replacement of resistors):
Max Discharge Current: 30A
Max Charge Current: 5A (requires a more powerful charger!)⚠️ Attention: Increase in discharge current above 25A For standard Xiaomi batteries, cells overheat and battery life is reduced by 2-3 times, and the risk of fire increases with damage to insulation or mechanical shocks.
Controller firmware|Modifications BMS|Engine replacement|Installation of an additional battery|Other-->
3. Engine replacement: radical upgrade
Standard engines in Xiaomi scooters (for example, 250W into M365 or 350W Pro 2 is designed for moderate loads, replacing them with more powerful analogues (for example, 500W–800W) can increase the speed to 40-50 km / h, but will require the revision of the frame, controller and cooling system.
Popular options for upgrade:
| Model scooter | Standard engine | Recommended upgrade | Max: Speed after replacement |
|---|---|---|---|
| Xiaomi M365 | 250W | 500W–600W (for example, QS Motor 273) | 35-40 km/h |
| Xiaomi Pro 2 | 350W | 800W (for example, MY1020) | 45-50 km/h |
| Xiaomi 1S | 300W | 500W–700W | 40-45 km/h |
What to consider when replacing:
- 🔧 Modification of mounts will be required (the new engine may not fit in size).
- 🔥 Additional cooling must be installed (e.g. radiator or fan).
- ⚡ The controller must maintain an increased current (otherwise it will burn).
What happens if you install a more powerful engine? 1000W?
Installation of an additional battery: more energy - higher speed
The speed of the scooter depends not only on the power of the engine, but also on the battery voltage. 36V (10S) or 48V (13S Installation of an additional battery (in parallel or in series) allows you to increase the voltage to 60V–72V, This directly affects the speed of.
Upgrade options:
- 🔋 Parallel connection: increases capacity (more range), but does not affect speed.
- ⚡ Serial connection: increases voltage (higher speed, but faster engine wear).
- 🔄 Replacement with LiPo batteries (for example, 22.2V 6S race-scooter).
Example of calculation for Xiaomi M365:
// Original battery:
Voltage: 36V (10S)
Capacity: 7800mAh
// After adding a second battery in series:
Voltage: 72V (20S)
Max. speed: ~45 km / h (when the controller is firmware under 72V)⚠️ Note: When connecting batteries consistently, be sure to use BMS The voltage difference between the cells is greater than the voltage difference between the cells. 0.1V It can cause overheating and explosion.
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Before buying an additional battery, check its compatibility with your controller. some firmware (for example, CFW) maintain tension 84V, standard ESC burn 60V+.
5. Optimization of wheels and gear ratio
The speed of the scooter depends not only on the electronics, but also on the mechanical part. Replacing the wheels with a smaller diameter or changing the gear ratio (for example, putting another asterisk on the engine) can increase the maximum speed by 5-15%.
Comparison of wheels for Xiaomi M365:
| Type of wheel | Diameter. | Impact on speed | Impact on acceleration |
|---|---|---|---|
| Standard. | 8.5" | Basic speed | Basic acceleration |
| Reduced slicks | 8.0" | +10% speed | -15% acceleration |
| Increased off-road | 10" | -5% speed | +20% acceleration |
How to change gear ratio:
- Remove the rear wheel and star from the engine.
- Install an asterisk with fewer teeth (for example, instead of a stellar stellar stellar stellar stellar stellar). 36T put it 30T).
- Adjust the tension of the chain or belt.
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Reducing the diameter of the wheels or star increases speed, but reduces torque, which means that the scooter will accelerate worse on the rises and require more current from the battery.
6. Brake tuning: why it matters for speed
At first glance, brakes don't seem to affect speed, but they don't. An efficient braking system allows you to get into corners faster and accelerate more confidently on straight lines. In Xiaomi scooters, standard mechanical brakes (disc or drum) often require improvement, especially after acceleration.
Methods of improving brakes:
- 🔧 Replacement of brake pads with ceramic or metal (for example, Sintered Pads).
- 💧 Hydraulics pumping (for models with hydraulic brakes, for example, Pro 2).
- 🔄 Installation of an additional brake (e.g. electromagnetic on the front wheel).
An example for Xiaomi M365:
// Standard brakes:
Braking distance from 25 km/h: ~4.5 m
Wear of pads: high
// After the upgrade:
Brakeway from 40 km/h: ~6 m (with ceramic pads)
Wear of pads: low⚠️ Note: At speeds above 35 km/h, Xiaomi standard brakes M365 It is recommended to install hydraulic brakes or a duplicate system (for example, regenerative braking through the controller).
7. Software tricks: settings through a mobile application
Not everyone knows, but even without physical improvements, you can slightly increase the speed of the Xiaomi scooter through the official or third-party application. KERS (regenerative braking system) and throttle response.
What can be customized:
- 📱 Switching from Eco to Sport increases speed by 5-10%.
- ⚡ Level. KERS: Reduced recovery of brake energy reduces resistance during acceleration.
- 🔄 Gas sensitivity: increased throttle response makes acceleration sharper.
Instructions for Mi Home:
- Connect the scooter to the application via Bluetooth.
- Go to Settings. → Driving mode.
- Choose Sport and install it. KERS 0% (unless recovery is required).
- In the Drocell section, select Aggressive.
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Software settings increase speeds by up to 10 percent, but they don't remove hardware constraints.
Risks and consequences of overclocking the Xiaomi scooter
Before you start tuning, assess the possible negative consequences:
- 🔥 Overheating and fire: Increased current and voltage increases the risk of short circuit.
- 🚨 Loss of warranty: Any modifications will void Xiaomi warranty.
- 🛑 Law problems: Most countries ban speeds above 25 km/h for electric scooters.
- 💸 Fast wear: battery, engine and bearings will fail 2-3 times faster.
Statistics of breakdowns after dispersal (according to service centers):
| Type of modification | Average speed gain | Risk of breakdown in the first year |
|---|---|---|
| Controller firmware | +20–30% | 15% |
| Modifications BMS | +30–40% | 40% |
| Engine replacement | +50–100% | 60% |
⚠️ Note: If you decide to disperse the scooter, be sure to install additional protection: thermal sensors on the battery, fuses on the battery 30A Class C fire extinguisher (for lithium batteries).