Description
BMW E38 / E39 Standalone ECU Upgrade | RM Primis Plug & Play ECU for M5.2.1 & ME7.2 / M7.2 M62 Engines
Product Overview
Unlock the full performance potential of your BMW E38 or E39 with the RM Primis Standalone ECU, engineered specifically for vehicles originally equipped with M5.2.1 and ME7.2 / M7.2 M62 engine management systems.
This true plug-and-play ECU solution delivers exceptional drivability, advanced tuning capabilities, and complete CAN-Bus integration—making it one of the most powerful and flexible aftermarket ECUs available for the M62 platform.
What’s Included
Your RM Primis kit arrives ready to install with:
RM Primis Standalone ECU
Harness adaptor for direct plug-in
ECU-adaptor cable
USB communication cable
Additional accessories required for setup
No wiring rewrites or complicated installations—simply plug it in and start tuning.
Full CAN-Bus Integration
Designed to work seamlessly with BMW’s factory systems, the RM Primis offers:
Complete CAN Bus control of major vehicle modules
ZF 5HP automatic transmission support (GS20 TCU compatibility)
Free CAN-based 8HP transmission control (details HERE)
Whether you run the original gearbox or plan an 8HP swap, the RM Primis ECU offers unmatched flexibility.
Advanced Engine Management Features
This ECU controls and monitors every essential system on the M62 engine, including:
Dual VANOS management
EVAP canister / tank vent
DISA valve operation
PWM cooling fan control
Electronic thermostat
Idle control valves
Boost, ignition, fuel, and safety strategies
Professional Tuning & Datalogging
The included RM-Tuner software provides:
Real-time datalogging
Complete access to fuel, ignition, VVT, boost, and protection tables
User-friendly layout for beginners and professionals
Perfect for both street builds and high-power turbocharged setups.
Performance & Motorsport Functions
Internal MAP Sensor (400 kPa)
Ideal for naturally aspirated and boosted engines, giving accurate pressure monitoring up to ~3 bar boost.
Drive-by-Wire Support
Add electronic throttle control for smoother throttle modulation and improved drivability.
Wideband Compatibility
Compatible with Bosch LSU 4.9 / 4.2 (NTK support currently under testing).
Boost Control
Closed-loop & open-loop PID boost control
Dual boost tables
Boost-by-gear available
VVT (VANOS) Control
2 channels
Open and closed loop mode
- 1 and 2 solenoids per CAM
Idle Control
Supports 1-wire and 3-wire idle valves and ignition-based idle stabilization.
Motorsport Features
Launch control
Antilag
Boost-by-gear
Built-in safeties for MAP, AFR, CLT, IAT, oil pressure, and more
Technical Specifications
6x GP low-side outputs
4x GP high-side outputs
1–2x VR sensor inputs
3x digital inputs
8x analog inputs
Dedicated IAT / CLT / TPS inputs
2x knock sensor inputs
1x electronic throttle input
Full CAN-Bus communication
Programmable inputs/outputs with multiple logic rules
8HP Transmission Compatible – More info HERE.
Software & Customization
Fully programmable through RM-Tuner
Load custom strategies, boost logic, safety rules, and more
Backed by our detailed online Help Center for step-by-step assistance
Compatibility Notes
The RM Primis does not directly receive the IBus A/C request in some BMW E38/E39 models.
A/C activation must instead be handled using a ground signal trigger.
Why Choose RM Primis for Your BMW E38/E39?
True Plug-and-Play: No wiring headaches—connect and start tuning
Massive Feature Set: Supports everything from basic N/A builds to high-boost turbo conversions
8HP Ready: Built-in CAN for modern transmission swaps
Professional Support: Free tuning software + full documentation
Superior Performance: Precision engine control with advanced safety and datalogging
Perfect for enthusiasts, tuners, and high-performance BMW applications.
