Detailed Guide on Enabling and Disabling Speed Limiter for Electric Vehicles

I. Basic Principle of Electric Vehicle Speed Limiter

• Controller-based limitation: The most common type, setting the maximum motor power via programming.
• Speed limit wire control: Restricting speed through specific wire harness connections.
• Voltage limitation: Limiting the output voltage of the battery.

• Sensor monitoring: Detecting speed and cutting off power when exceeding the limit.

II. Detailed Methods to Disable Speed Limiter

1️⃣ Throttle + Brake Combination Method (Suitable for Most Electric Bicycles)

• Squeeze the brake and twist the throttle to the maximum.
• Turn on the electric door lock (keep the brake and throttle in position).
• Release the throttle, then twist it to the maximum again, repeating 3 times (maintain braking throughout).
• After twisting the throttle to the maximum for the third time, wait 3-5 seconds.
• Release the brake and throttle; the speed limiter is disabled.

• Squeeze brake + twist throttle to maximum → Turn on electric door lock → Maintain for 15-20 seconds → Release brake and throttle.

2️⃣ Button Combination Method (Suitable for Models with Remote Control or Multifunctional Buttons)

• Turn on the electric door lock.
• Long-press the unlock button (cruise button for some models) until a "beep-beep" sound is heard; the speed limiter is disabled.
• To restore the speed limiter, long-press the lock button until a "beep-beep" sound is heard; the speed limiter is enabled.

3️⃣ Wire Harness Operation Method (Suitable for Electric Tricycles and Some Electric Bicycles)

• Turn off the power and prop up the vehicle.
• Locate the controller (usually under the seat).
• Identify the speed limit wire (typically two white or same-color connected wires).
• Unplug or cut the connecting plug, and insulate the wire ends with electrical tape.
• Reconnect the wires to restore the speed limiter.

III. Comparison of Speed Limiter Disabling Methods by Vehicle Type

IV. Safety and Legality Reminders

1. Legality Issues:
   • The New National Standard (GB17761-2018) clearly stipulates that the maximum speed of electric bicycles shall not exceed 25km/h, and they "shall not have detachable or modifiable speed-limiting devices".
   • Disabling the speed limiter violates the Road Traffic Safety Law and constitutes illegal modification. It may lead to:
     • Failure to register or inspect the vehicle.
     • Insurance claim denial.
     • Increased liability in traffic accidents.
2. Safety Risks:
   • The braking system is matched to the speed limit; speeding will extend the braking distance.
   • The frame structure, battery, and motor are designed based on the speed-limited state. Modification may cause component damage or safety accidents.
   • New national standard models are equipped with "overspeed power cutoff" protection, which may fail after modification.

V. Practical Suggestions

1. Prioritize Non-Destructive Methods:
   • Try Method 1 or Method 2 first; these operations are reversible and do not damage the vehicle.
   • Test the speed after success to ensure it does not exceed the safe range.
2. If Using the Wire Harness Method:
   • Take photos to record the wire harness position before operation.
   • Properly insulate the cut wire ends with electrical tape to prevent short circuits.
   • Keep the speed limit wire for future restoration.
3. Seek Professional Help:
   • Consult an authorized brand maintenance point if unsure.
   • Some brands offer official speed-up services (e.g., certain electric motorcycles).

Summary

1. Throttle + Brake Combination Operation (Method 1)
2. Button Combination Method (Method 2)
3. Wire Harness Operation Method (Method 3, only for tricycles and some old models)