STi MY16 — Stage 2 ECU Tune
- Increased power output to 204kW at 22psi
- Enhanced turbocharger efficiency with TD05-20G upgrade
- Improved intercooler response with Process West top-mount design
- Better fuel atomization with ID1050 injectors
- Optimized boost control for smooth delivery
- Enhanced valve train durability with forged internals
This MY16 STi was built for serious track use and handed the full treatment: forged internals, upgraded valve springs and head gasket, then fed by larger injectors and a bigger turbo. The Motec M150 GPR replaced the factory ECU entirely, giving proper control over fuelling and ignition to suit the hardware.
With 1.52 bar of boost and a 3-inch exhaust flowing through the upgraded top-mount intercooler, the tune delivered 204 kW at the wheels and 368 Nm. The result is a well-sorted package that puts the power down cleanly through the AWD system, built to withstand sustained laps rather than peak numbers on a single dyno pull.
The calibration accounts for the TGV delete and manages boost delivery through the electronic controller, keeping everything in safe zones while making the most of the turbo upgrade and supporting mods.
Why use a Motec M150 on this build?
With forged internals and a larger turbo, the factory ECU can't manage the fuelling and ignition mapping properly. The M150 GPR is a full standalone system that gives precise control over every parameter, essential when you're pushing well beyond stock hardware limits on track.
Is this tune suitable for street use?
This is a closed-circuit competition build with forged internals and a standalone ECU. While it can be driven on the road, it's calibrated for off-road use with track-focused hardware.
What fuel does this calibration require?
The tune was developed for petrol. With this level of modification and boost pressure, premium 98 RON is the minimum—many would consider E85 for added safety margin on track.
This calibration was developed for a workshop like yours
The Subaru STi above was calibrated by Protunes for a partner workshop — they did the vehicle work and kept their customer; we did the calibration engineering on the Motec M150 GPR. Add professional ECU and TCU calibration to your workshop without employing a calibration engineer.
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