Link Engine Management
Link G4X WRXLink WRX2X ECU
Link G4X WRXLink WRX2X ECU
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The Link G4X WRXLink WRX2X ECU is a direct-fit engine management system designed for early Subaru WRX and STI platforms using the EJ20 engine. It installs into the factory ECU enclosure and connects directly to the OEM wiring loom with no modification required.
This ECU is intended for manual transmission vehicles only and supports most factory systems while providing advanced tuning capability through the G4X platform.
Important: Manual transmission only. Designed for WRX V1–V2 EJ20 engines. An intake air temperature sensor is highly recommended. E-throttle requires modification before use. Please confirm your ECU pinout connector matches the header shown in the product images before purchase.
Engine Control Capability
- Designed for EJ20 turbo engines
- Sequential fuel injection
- Digital triggering using OEM patterns
- Precision closed loop cam control
- Staged injection support
- Knock control with windowing
Hardware and Platform
- Direct plug-in installation using factory ECU enclosure
- Continuous onboard barometric correction
- USB tuning connection
- CAN communication support
- 512 MB onboard data logging
Vehicle Compatibility
- Subaru WRX and STI V1–V2
- GC8A, GC8B, GC8C chassis
- Production dates 10/1992–08/1996
- Manual transmission only
G4X Plug-In Key Features
- Up to 6D fuel and ignition mapping
- OEM idle hardware supported
- 5D boost control with three switchable tables
- Launch control, anti lag, and flat shift
- Individual cylinder fuel and ignition correction
- Gear-based fuel, ignition, and boost compensation
- QuickTune automated fuel tuning
- Selectable dual fuel, ignition, and boost maps
- CAN communication support
I/O Expansion
Expansion Connector 1
- GND – Sensor ground
- +5V – Low current +5V supply
- DI5 – Digital input
- DI6 – Digital input
- Analogue Voltage 5 (0–5V)
- Analogue Voltage 6 (0–5V)
- Analogue Temperature 2
- Analogue Temperature 3
Expansion Connector 2
- GND – Sensor ground
- +5V – Low current +5V supply
- DI9 – Digital input
- DI10 – Digital input
- Analogue Voltage 8 (0–5V)
- Analogue Voltage 9 (0–5V)
- Ign 7 – Ignition auxiliary output
- Ign 8 – Ignition auxiliary output
Downloads and Resources
