EFM4 Integrated Drive Unit

Name: EFM4 Integrated Drive Unit
Brand: Voltsport
SKU: IDM_EFM4-122
Availability: OutOfStock

Out of stock

EFM Gearbox 3:1 (12.2:1 ratio) 2:1 (no gearbox) 3:1 (9.7:1 ratio)

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Excluding VAT

Motor Pairing Considerations

Most customers speak to us before purchasing to ensure compatibility with:

Load profile: Is the motor driving a constant load, variable load, or shock loads?
Duty cycle: Continuous vs intermittent use, peak vs average power demand.
Environment: Marine (corrosion, humidity), agriculture (dust, mud), motorsport (heat, vibration).
Power/torque curve (does the motor deliver the torque at the speed you need?).
Cooling requirements (air vs liquid cooled, ventilation needs).

Unlock OEM‑level electric drive performance with the EFM4 3‑in‑1 Electric Drive Unit, a compact, high‑efficiency powertrain engineered for serious EV builders. Designed around a 400 V architecture, this integrated system combines a high‑speed traction motor, inverter, and bolt‑on transmission into one lightweight, installation‑ready package.

Built on Stellantis drivetrain technology and refined by Electrofit & Voltsport, the EFM4 delivers exceptional power density, smooth operation, and rock‑solid reliability for road‑legal conversions, motorsport, off‑highway, and specialist EV applications.

Why Choose the EFM4
The EFM4 is engineered for projects that demand OEM‑grade refinement without OEM‑grade complexity. Its integrated layout reduces wiring, simplifies installation, and delivers a clean, professional powertrain solution. With its high efficiency, wide operating range, and robust cooling system, it’s ideal for everything from lightweight sports EVs to commercial conversions.

Technical Highlights

Nominal Voltage: 400 V DC
Cooling: Water/Glycol
Transmission: Stellantis bolt‑on, 9.7 or 12.2 ratio
Max Speed: >15,200 rpm
Continuous Torque: 210 Nm
Peak Power (10 s): 210 kW @ 380 V
Weight: 73 kg (motor + inverter), 92.7 kg (complete 3‑in‑1)

Perfect For:

Road‑legal EV conversions
Motorsport and track builds
Light commercial EVs
Off‑highway and industrial EV platforms
Prototype and R&D applications

Specifications

Product Datasheet	Datasheet
Dimensions	-
Manual	-

Any questions?

If you are purchasing motor/controller or component pairings and you are not sure - please contact us first. Stock can be reserved as necessary.

Phone: 01914 932 345 (9am to 5pm)

Outside of UK working hours, it is best to email us and we will get back to you as soon as possible.

Email: info@voltsport.co.uk

Does it come with a warranty?

Yes most products have a standard warranty, motors and controllers have extended warranty; used or second-hand products will not have warranty, but your purchase will still be protected. We would never sell you a product we have not inspected ourselves.

What happens if I don't like it?

If you are facing technical issues, let us help you first. We know how tricky it can be with wires, pins and complicated tools so let us see if we can figure it out first. In the chance that your product is defective, then you can use our returns process.

How fast is shipping?

UK Economy - 4 Days

UK Express 2-3 Days

International shipping can vary.

Items can also be collected from our facilities, but please advise us when you want to collect and access to forklift truck etc.

What's the returns policy?

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EFM4 Integrated Drive Unit