Link G4X WRX4X Plug-In ECU – Subaru WRX & STI V3–V4 EJ20 (1996–1998)

WRXLink (3–4) – WRX4X G4X Plug-In ECU for Subaru WRX & STI V3–V4 EJ20. Easy to install, affordable, and reliable. This ECU fits inside the factory OEM enclosure and connects to the original wiring loom with no changes required for the supported models.

Designed for

WRX & STI Version 3–4 with EJ20 engine (build dates 09/1996 to 08/1998).

Suitable applications (227-4000)

• GC8D
• GC8E
• WRX & STI from 09/1996 to 08/1998

Important fitment notes

• Manual transmission only.
• Air temp sensor recommended.
• Please check your connector matches the header shown in the product photos before purchasing.
• This ECU requires a modification before E‑Throttle is usable.

G4X PlugIn key features

• Up to 6D fuel and ignition mapping
• Precision closed loop cam control (four cam, independent control)
• Sequential fuel delivery
• Digital triggering, all OEM patterns
• OEM idle hardware supported
• 5D boost control with three switchable tables
• Motorsport features: antilag, launch, flat shift
• Continuous barometric correction (on board)
• CAN port
• QuickTune automated fuel tuning
• Individual cylinder correction
• USB tuning cable included
• Stats recording into on board memory
• Gear compensations for spark, boost and fuel
• Real time selectable dual fuel, ignition and boost maps
• Supports Hall, VR, or optical sync and crank sensors
• Boost control referenced to gear, speed or throttle position
• 512 MB data logging memory
• Staged injection
• Knock control with “windowing”

I/O options

Expansion connector 1

• GND — Sensor Ground Only
• +5V — Low Current +5V Supply
• DI 5 — Digital Input
• DI 6 — Digital Input
• Volt 5 — Analog 0–5 V input
• Volt 6 — Analog 0–5 V input
• Temp 4 — Temperature sensor input
• Temp 3 — Temperature sensor input

Expansion connector 2

• GND — Sensor Ground Only
• +5V — Low Current +5V Supply
• DI 9 — Digital Input
• DI 10 — Digital Input
• Volt 8 — Analog 0–5 V input
• Volt 9 — Analog 0–5 V input
• Ign 7 — Ignition 7 Auxiliary Output
• Ign 8 — Ignition 8 Auxiliary Output

Downloads

• 📘 Specifications — G4X WRXLink (3–4) WRX4X
• 🛠️ Installation Manual — G4X WRXLink (3–4) WRX4X
• 🧰 Wiring & Pinout — G4X WRXLink (3–4) WRX4X

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