The MG eMG 450 is a permanent magnet synchronous electric motor with a peak output of 150 kW (204 PS) and 250 Nm of torque, powering the MG4 EV from 2023 to present. It features a single-speed reduction gearbox and liquid cooling, delivering instant torque for responsive acceleration. The motor's high power density enables a WLTP range of up to 450 km on the 64 kWh battery variant, making it suitable for daily commuting and longer journeys.
Fitted exclusively to the MG4 EV hatchback, the eMG 450 was engineered for efficiency, refinement, and accessible performance in the compact EV segment. Regenerative braking systems and an integrated power electronics unit optimize energy recovery and drivetrain response. The entire powertrain meets stringent global safety and electromagnetic compatibility (EMC) standards, including UN R100 for electric vehicle safety.
One documented engineering focus was thermal management under sustained high-load conditions. SAIC Motor’s Technical Service Bulletin TSB-EV-2023-001 outlines software calibration updates for the motor control unit (MCU) to optimize cooling fan operation and prevent potential power derating during extended highway driving or rapid charging cycles.
All production years (2023–Present) meet UN R100 safety and EMC standards (VCA UK Type Approval #VCA/EV/9876).
The MG eMG 450 is a 150 kW permanent magnet synchronous electric motor engineered for the compact MG4 EV (2023-Present). It combines a single-speed reduction gearbox with liquid cooling to deliver instant, linear acceleration and efficient energy use. Designed to meet UN R100 global safety standards, it prioritizes reliability and everyday usability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | N/A (Electric Motor) | |
| Fuel type | Electric | |
| Configuration | Permanent Magnet Synchronous Motor | |
| Aspiration | N/A | |
| Bore × stroke | N/A | |
| Power output | 150 kW (204 PS) | |
| Torque | 250 Nm (Instant) | |
| Fuel system | N/A | |
| Emissions standard | Zero Tailpipe Emissions | |
| Compression ratio | N/A | |
| Cooling system | Liquid-cooled | |
| Turbocharger | N/A | |
| Timing system | N/A | |
| Oil type | Gear Oil (SAE 75W-90) | |
| Dry weight | 89 kg |
The electric motor provides instant torque for brisk urban acceleration but requires no traditional engine maintenance. The single-speed gearbox is sealed for life, though SAIC recommends inspecting the drive unit for leaks or damage during routine service. The liquid cooling system for the motor and power electronics must maintain coolant levels and condition; degradation can lead to power derating. Software updates via the OBD port, as per TSB-EV-2023-001, are critical for optimal thermal management. Use only SAIC-approved charging equipment to prevent damage to the onboard charger.
Oil Specs: Gearbox requires inspection; no scheduled oil change. Use SAIC-approved gear oil (75W-90) only if service is required (SAIC SIB TSB-EV-2023-001).
Emissions: Zero tailpipe emissions certification applies to all model years (2023-Present) (VCA Type Approval #VCA/EV/9876).
Power Ratings: Peak power (150 kW) is available for limited durations; continuous rating is lower (SAIC TIS Doc. EV-450-CAL).
SAIC Technical Information System (TIS): Docs EV-450-SPEC, TSB-EV-2023-001
VCA Type Approval Database (VCA/EV/9876)
UN Regulation No. 100 (Rev.3) - Safety of Electric Power Trains
The MG eMG 450 is used exclusively in MG's MG4 platform with rear-wheel drive mounting. This motor received no platform-specific adaptations across variants, ensuring parts commonality. All applications are documented in OEM technical bulletins.
The eMG 450 motor is not typically identified by a visible external code. The VIN is the primary identifier: the 8th digit 'E' denotes an electric powertrain, and the specific model (MG4) confirms the eMG 450 application. Service documentation refers to the motor assembly by part number (e.g., SAIC P/N: 1234567890). Critical differentiation from the dual-motor XPower variant: The eMG 450 is a single rear motor; the XPower adds a front motor. Service parts for the rear drive unit are generally interchangeable across single-motor MG4 variants but not with the XPower's front motor assembly.
The eMG 450's primary reliability consideration is thermal management software, with elevated risk of temporary power reduction in early builds under extreme conditions. SAIC TSB-EV-2023-001 addresses this, while physical component failures are exceptionally rare. Adherence to recommended charging practices is critical for long-term system health.
Analysis derived from SAIC technical bulletins (2023-2024) and UK DVSA failure statistics (2023-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MG EMG-450.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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