Audi 2.7 RS4 / S4 B5 Ecumaster EMU Black ECU & Plug-and-Play Adaptor

The Audi 2.7 RS4 / S4 B5 Ecumaster EMU Black ECU & Pre-Built Plug-and-Play Adaptor Kit is designed to connect the factory 2.7 Audi RS4 / S4 B5 engine harness to an Ecumaster EMU Black standalone ECU.

This kit includes an Ecumaster EMU Black ECU and a pre-built, ready-to-fit plug-and-play adaptor, giving you advanced standalone engine management without the usual wiring work associated with a full standalone installation.

Ideal for tuned 2.7 Bi-Turbo builds, engine swaps, track cars, and motorsport applications, this kit allows the EMU Black to take control of the engine while retaining the compatible factory engine harness.

Key Features

Designed for Audi 2.7 RS4 / S4 B5 Engines
Suitable for compatible Audi 2.7 RS4 and S4 B5 engine harness applications.

Ecumaster EMU Black ECU Included
Supplied with the Ecumaster EMU Black standalone ECU for advanced programmable engine management control.

Pre-Built Plug-and-Play Adaptor Included
Supplied as a complete, ready-to-fit adaptor, not loose connectors and wires.

Uses the Factory Engine Harness
Connects the Audi 2.7 RS4 / S4 B5 engine harness to the Ecumaster EMU Black ECU.

Standalone ECU Control Without the Wiring Hassle
A clean plug-and-play solution for customers wanting more control, tuning flexibility, and motorsport functionality.

Ideal for 2.7 Bi-Turbo Builds
Well suited to modified S4 / RS4 engines, upgraded turbo setups, engine swaps, track cars, and motorsport use.

Optional Bosch LSU 4.9 Lambda Upgrade
A Bosch LSU 4.9 wideband lambda sensor and matching connector can be added as an optional extra if required.

Ecumaster EMU Black Specification

The Ecumaster EMU Black is a powerful standalone engine management system designed to control advanced fuel, ignition, boost, and auxiliary strategies on a wide range of engines.

Key EMU Black features include:

• Built-in 4 bar MAP sensor
• Built-in wideband lambda controller
• Bosch LSU 4.2 and LSU 4.9 wideband sensor support
• Drive-by-wire throttle control support
• Flex fuel support
• CAN bus communication
• Advanced fuel and ignition control
• Advanced boost control strategies
• Launch control
• Flat shift
• Traction control strategies
• Motorsport data logging
• Knock control support
• Configurable inputs and outputs
• Closed-loop fuel control
• Closed-loop boost control
• Support for staged injection and advanced ignition strategies
• Windows-based tuning software

Optional Lambda Upgrade

An optional Bosch LSU 4.9 wideband lambda sensor and matching connector can be added to this kit if required.

Adding the lambda option allows the Ecumaster EMU Black to use wideband lambda feedback for accurate air/fuel ratio monitoring and closed-loop fuel control, making it a useful upgrade for tuned Audi 2.7 Bi-Turbo builds.

Kit Includes

• 1 × Ecumaster EMU Black standalone ECU
• 1 × Audi 2.7 RS4 / S4 B5 pre-built plug-and-play adaptor

Optional Extras

• Bosch LSU 4.9 wideband lambda sensor
• Matching lambda connector
• Additional sensors or wiring by request

Suitable Applications

• Audi S4 B5 2.7 Bi-Turbo engine harness
• Audi RS4 B5 2.7 Bi-Turbo engine harness
• Audi 2.7T standalone ECU conversions
• 2.7 Bi-Turbo engine swaps
• Upgraded turbo builds
• Fast road cars
• Track cars
• Motorsport builds

Important Notes

• Please confirm your vehicle model, engine, year, and ECU connector before ordering
• This listing is for the Ecumaster EMU Black ECU and plug-and-play adaptor kit
• Supplied with a pre-built, ready-to-fit plug-and-play adaptor, not loose connectors and wires
• Bosch LSU 4.9 wideband lambda sensor and connector are optional extras and are not included unless selected
• Professional installation and mapping are strongly recommended
• A base map may require adjustment before use
• Final calibration should be carried out by a qualified mapper
• Some factory functions depend on vehicle specification, wiring, and final ECU configuration
• Some features may require additional wiring, sensors, or modules

Lead Time Note

Please note there may be a 5–7 working day lead time if the adaptor needs to be built to order. We will confirm availability and build status after purchase where required.

Motorsport Use Notice

This product is intended for motorsport, competition, and off-road use where permitted. Please ensure the product is suitable for your intended application and complies with any relevant rules, regulations, or emissions requirements before use.