The MG eMG Scalable B – Electric is a permanent magnet synchronous electric motor introduced in 2023 for MG's dedicated EV platform. It features a single-speed reduction gearbox and liquid-cooled power electronics, delivering 170 kW (231 PS) and 350 Nm of torque for brisk, linear acceleration. The scalable architecture allows for integration into various wheelbases and vehicle sizes, targeting global urban and suburban mobility.
Fitted to the MG4 EV (MG Mulan) and MG Cyberster models, this motor was engineered for responsive performance and everyday efficiency. Emissions compliance is inherent to its zero-tailpipe-emission design, meeting all current global standards including Euro 7 EV equivalency. The system enables a WLTP range of up to 450 km and supports DC fast charging at rates up to 135 kW.
One documented area for attention is potential software-related torque vectoring calibration in early Cyberster RWD units, addressed in SAIC Motor's Technical Service Bulletin EV-05-2024. This update refined the traction control logic for improved handling dynamics. No major hardware revisions have been issued as of 2025, with continuous over-the-air (OTA) software updates being deployed.
All production years (2023–Present) meet zero tailpipe emissions standards (VCA UK Type Approval #VCA/EMS/5680).
The MG eMG Scalable B – Electric is a 170 kW permanent magnet synchronous motor engineered for compact and sports EVs (2023–Present). It combines a single-speed reduction gearbox with liquid-cooled power electronics to deliver instant torque and smooth power delivery. Designed for global markets, it inherently complies with all current zero-emission vehicle regulations.
| 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 | 170 kW (231 PS) | |
| Torque | 350 Nm (instantaneous) | |
| Fuel system | N/A | |
| Emissions standard | Zero Tailpipe Emissions | |
| Compression ratio | N/A | |
| Cooling system | Liquid-cooled (motor and power electronics) | |
| Turbocharger | N/A | |
| Timing system | N/A | |
| Oil type | SAIC EV Gear Oil (75W-85 GL-4) | |
| Dry weight | Approx. 89 kg |
The electric motor provides immediate, silent torque for effortless city driving and confident highway merging. To maintain optimal performance, SAIC recommends an annual inspection of the cooling system and gearbox oil. The specified 75W-85 GL-4 gear oil is critical for the longevity of the reduction gearbox. Owners should ensure software is kept up-to-date via OTA updates to benefit from the latest traction and torque vectoring calibrations, as outlined in SAIC TSB EV-05-2024.
Oil Specs: Requires SAIC EV Gear Oil (75W-85 GL-4) for the reduction gearbox (SAIC Motor Owner's Manual).
Emissions: Zero tailpipe emissions certification applies to all model years (2023–Present) (VCA Type Approval #VCA/EMS/5680).
Power Ratings: Measured under SAE J1349 standards for electric motors (SAIC Motor PT-2023).
SAIC Motor Technical Information System (TIS): Docs EV-MOTOR-B-01, EV-05-2024
VCA Type Approval Database (VCA/EMS/5680)
SAIC Motor Parts Catalogue (EPC) Rev. 3.1
The MG eMG Scalable B – Electric was used across MG's Modular Scalable Platform (MSP) with rear-wheel-drive mounting. This motor received platform-specific adaptations-including unique inverter calibrations for the Cyberster-creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the motor identification plate on the side of the motor housing, typically near the high-voltage connector (SAIC TIS EV-MOTOR-B-01). The vehicle's VIN plate will also list the powertrain type as "BEV". Visually, the motor is identifiable by its compact, cylindrical housing and the presence of orange high-voltage cables. Critical differentiation from other MG EV motors: The Scalable B motor is used in RWD applications; AWD models use a different front motor. Software calibrations are specific to the MG4 and Cyberster applications.
The eMG Scalable B's primary reliability consideration is software calibration for torque vectoring and traction control, with elevated incidence in early Cyberster units. SAIC Motor service data indicates this is resolved via OTA updates, while UK DVSA records show no systemic safety failures. Maintaining up-to-date software and adhering to annual cooling system inspections make proactive system management critical.
Analysis derived from SAIC Motor 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-SCALABLE-B-ELECTRIC.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
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