Designed for the WRX V1-2 EJ20. 

• Please check your pinoutconnector matches the header in the listed photo before purchasing.  
• This ECU works for manual transmissions only.  
• Air temp sensor highly recommended. 
• Most factory features are supported. 
• Check the features tab for I/O input & output expansion options.
• This ECU will need a modification before E-Throttle is usable.

Suitable Applications for 226-4000 Automotive Computer Unit:

• GC8A 
• GC8B 
• GC8C 
• WRX and STI from 10/1992 to 8/1996 

G4X PlugIn Key Features (where applicable):
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
Sync and crank sensors can be a combination of Hall effect, variable reluctance or optical
Boost control referenced to gear, speed or throttle position
512 mega bytes data logging memory within data storage unit
Staged injection
Knock with "windowing"


The following expansion connector inputs/outputs are provided: 
Expansion connector 1  
Gnd                Sensor Ground Only  
+5V                Low Current +5V Supply 
DI 5                Digital Input 
DI 6                Digital Input 
Volt 5                Analog 0-5V input 
Volt 6                Analog 0-5V input 
An Temp 2        Temperature sensor input 
An 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 0-5V input 
Volt 9                Analog 0-5V input 
Ign 7                Ignition 7 Auxiliary Output 
Ign 8                Ignition 8 Auxiliary Output 


Download Manual 
Click here

🎁 BONUS — FREE Remote Setup Support ($297 Value)

When you purchase from Kugan Tuning, you also receive:

• Remote ECU flashing assistance
• Basemap selection guidance
• Startup and sensor verification
• Professional tuning support

This ensures your car starts, idles, and runs correctly the first time — helping you avoid costly mistakes and wasted dyno time.