2004 SUBARU WRX · LINK G4 · FLEX FUEL
A WRX for autocross.
Link engine management and flex-fuel calibration by Keith Fields, documented on AWD Tuning’s dyno in the December 2025 feature.
Discuss my Link project →
- THE CAR
- 2004 Subaru WRX
- ENGINE MANAGEMENT
- Link G4 · flex fuel
- INTENDED USE
- Autocross
ON THE ROLLERS
Watch the calibration session.
AWD’s December 6, 2025 feature documents this WRX’s Link G4 and flex-fuel setup for autocross. Watch the original session below.
PLAN YOUR OWN COMBINATION
Start with the car and how you drive it.
For an autocross project, tell me about your engine, turbo, fuel system, ECU and intended use. We can plan the calibration around the complete setup, including throttle response and usable power delivery.
A flex-fuel project also needs the appropriate fuel hardware, ethanol measurement and ECU configuration. Send your installed equipment and available logs so I can review the tuning scope.
Explore Link ECU tuning and preparation →What are you building?
Send your WRX’s year, hardware and goals. No payment is required to ask about your project.
Ask Keith about my WRX →