BMW F80 M3 F82 F83 M4 S55 431HP Engine Unit Module ECU DME 8650701 Automatic

The BMW F80 M3 F82 F83 M4 S55 431HP is an original part from the Electronic Control Units and Controllers group, designed for sporty BMW models with the S55 engine producing 431 HP. This used control unit ensures the factory operating characteristics of the powertrain, maintaining correct parameters for the gasoline engine and manual transmission, which translates to consistent, predictable vehicle behavior.

Specifications and technical data

• SKU: 8650701-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8650701
• Substitutable numbers: 8650701, 0261S12856, 0 261 S12 856
• Fuel type: Petrol
• Gearbox type: Automatic
• ECU type: Engine Control Unit
• Category: ECUs & Computer Modules

Control Unit Purpose and Function

The presented module belongs to the Electronic Control Units and Controllers category and is responsible for advanced engine management in BMW M3 F80 and M4 F82/F83 models equipped with the S55 431 HP unit. It controls, among other things, fuel injection, ignition timing, boost pressure, and interaction with other vehicle systems, which is crucial for maintaining stable performance and proper powertrain operation.

The module is configured for a gasoline engine and a manual transmission, ensuring that the control logic is adapted to the characteristics of manual gear changes and the dynamic driving style typical of M versions.

Benefits of Using an Original BMW Module

Using an original control unit from a dismantled vehicle allows for consistency with BMW's factory electronic architecture. This means:

• maintaining the stock engine map for the S55 431 HP engine,
• proper interaction with the vehicle's onboard systems,
• no need to adapt universal aftermarket solutions.

For users expecting precise throttle response, predictable vehicle behavior on the track and road, and stable operation across the entire RPM range, such a module is a technically safe choice when replacing a damaged control unit.

Application in the Powertrain (Gasoline + Manual)

BMW M3 F80 and M4 F82/F83 versions with the S55 431 HP engine in a gasoline + manual configuration require a control unit tailored to the specific operating logic of the powertrain. This module:

• takes into account the characteristics of manual gear shifting,
• coordinates engine response to rapid downshifts and accelerations,
• ensures proper interaction with stability control and traction control systems.

This provides the driver with consistent, predictable vehicle behavior, and the powertrain operates within the parameters intended by the manufacturer.

Product Condition and Use of Used Parts

The offered module is used, allowing for the combination of original part functionality with a more favorable purchase cost. For many BMW M series users, this is a sensible compromise between quality and budget, especially for repairs requiring the preservation of factory electronics.

Before installation, it is recommended to verify compatibility with your specific vehicle configuration and to perform appropriate programming or adaptation procedures at a specialized service center to ensure the control unit is correctly integrated with the rest of the systems.

More About BMW Electronic Modules and Used Parts

If you want to better understand how to care for engine control units, FRM modules, or the iDrive system in BMW 3 and 5 Series models, and how to safely use parts from dismantled vehicles, read the article: Years of Driving Pleasure – How to Care for iDrive Systems and Electronic Modules in BMW 3 and 5 Series Models. You will find practical tips on diagnostics and selecting used electronic components there.

If you are planning a comprehensive repair or upgrade of the engine control area in your BMW and need other parts from the same group, such as control modules, engine controllers, or other electronic units, check the available parts in the BMW Electronic Control Units and Controllers category.

Additionally, to better plan your used component purchases and optimize service costs, you can use the advice contained in the guide: Used Parts – Your Guide to the Best Offers in the Automotive Store, which describes how to make informed choices about dismantled parts and care for their continued operation.