Description
BMW S50 Standalone ECU
Upgrade your BMW E36 M3 with a BMW S50 Standalone ECU engineered specifically for the legendary BMW S50 engine.
The RM-Primis BMW S50 Standalone ECU replaces the factory Bosch ECU while retaining OEM-level integration and unlocking full motorsport-grade control.
As a result, you gain precise VANOS management, improved drivability, and complete tuning freedom—without cutting or modifying the original BMW wiring.
✅ Plug-and-Play ECU for BMW S50 Engines
This BMW S50 Plug-and-Play ECU is based on the RM-Primis universal standalone ECU combined with a dedicated Bosch 88-pin BMW harness adapter.
Therefore, installation is fast, clean, and fully reversible.
Supported engine:
BMW S50 (E36 M3)
Each unit is pre-configured before shipping, ensuring a ready-to-run installation.
✅ What’s Included with the BMW S50 Standalone ECU
RM-Primis Standalone ECU
BMW Bosch 88-pin harness adapter
ECU adapter cable
USB tuning cable
Pre-configured jumpers for BMW S50
Full access to RM-Tuner software
In short, everything needed to convert your BMW S50 to a modern standalone ECU.
✅ Advanced Engine & VANOS Control for BMW S50
Unlike piggyback systems, the BMW S50 Standalone ECU delivers complete authority over fuel, ignition, and VANOS control.
Engine Management Features
Full sequential fuel and ignition
Dual-VANOS control (open & closed loop)
Built-in 400 kPa MAP sensor
Wideband O₂ support (Bosch LSU 4.9 / 4.2)
Advanced idle control (1-wire & 3-wire valves)
Electronic throttle support (optional DBW upgrade)
Because of this, throttle response, mid-range torque, and high-RPM stability are dramatically improved.
✅ Motorsport Features for Track & High-Performance Builds
The BMW S50 is a motorsport icon, and the RM-Primis ECU is built to match.
Launch control
Flat-shift / torque reduction
Motorsport anti-lag
Dual open & closed loop boost control
Boost-by-gear
PWM fan control
Additionally, all fuel, ignition, and VANOS tables are fully adjustable via RM-Tuner.
✅ CAN-Bus & Drivetrain Expansion
The BMW S50 Standalone ECU includes full CAN-bus support, allowing integration with:
Digital dashboards
Data loggers
Expansion modules
ZF 8HP automatic transmission control (optional upgrade)
👉 Learn more about CAN and transmission support here:
https://help.primis-ecu.com
✅ Inputs, Outputs & Technical Specifications
Ignition outputs: 6
Injector outputs: 6
Low-side outputs: 6
High-side outputs: 4
Analog inputs: 8
Knock sensor inputs: 2
VR / Hall crank & cam support
Dedicated IAT / CLT / TPS inputs
Fully programmable I/O logic
This makes the ECU suitable for both OEM-plus and extreme motorsport builds.
✅ Built-In Engine Protection Strategies
To protect your BMW S50 under demanding conditions, the RM-Primis ECU includes:
Configurable rev limiter
Lean protection
Boost cut safety
Advanced knock control (per-cylinder)
Overrun fuel cut
Programmable analog sensor alarms
As a result, performance gains never come at the cost of reliability.
✅ Why Choose the RM-Primis BMW S50 Standalone ECU?
Designed specifically for BMW S50 engines
True plug-and-play installation
Full VANOS control
No subscriptions or locked features
Free RM-Tuner tuning software
Continuous firmware & software updates
Direct support from experienced engineers
Most importantly, this ECU scales from street builds to full race cars.
