STI MY11 G3 — Stage 2 ECU Tune
- Increased power output to 247 kW on ethanol fuel
- Optimized drivability across both petrol and ethanol fuel types
- Enhanced boost pressure management to 22 lbs
- Improved turbocharger efficiency with ATP STI Gold upgrade
- Refined fuel system calibration for flexfuel compatibility
This MY11 STI arrived with the usual suspect list: ATP gold turbo, top-mount intercooler, full exhaust, intake, and fuel system prepped for ethanol. The Ecutek flex fuel kit was already fitted, so the brief was straightforward—extract what the hardware could deliver safely on both 98 RON and E85, calibrated for closed-circuit competition use.
We delivered 247 kW and 435 Nm at the wheels on E85, up from 224 kW and 407 Nm. Peak boost lifted to 1.52 bar. The tune transitions cleanly between pump and ethanol blends without drama, which matters when you're mixing fuels between track days.
The EJ25 responds well to the gold journal bearing turbo—it spools earlier than the factory twin-scroll and holds boost better through third and fourth. Timing and fuelling are mapped conservatively enough to live on track, but there's still headroom if the owner adds bigger injectors down the line.
Does the flex fuel calibration adjust automatically between 98 and E85?
Yes. The Ecutek flex fuel system reads ethanol content in real time and the calibration adjusts ignition timing, fuelling, and boost accordingly. You can run any blend from pump 98 RON through to full E85.
Is 247 kW safe on the factory block and internals?
This calibration assumes factory internals and is mapped for closed-circuit use with appropriate cooling and maintenance intervals. It's within the envelope for a well-maintained EJ25, but track use always accelerates wear.
Will I need bigger injectors if I want more power later?
The current fuel system is near capacity on E85 at this output. If you're chasing another 20–30 kW, you'll need larger injectors and possibly an uprated pump.
Workshop & Dealer Access
Protunes supplies ECU calibration files exclusively to approved workshops, tuners, and dealers throughout Australia. Platform: Ecutek.
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