2004–2007 Subaru WRX STI – Open Source Staged Tunes

Unlock the potential of your 2004–2007 Subaru WRX STI with an LRW staged calibration utilizing EcuFlash open-source tuning software. Each calibration is tailored to your vehicle's modifications and fuel type, optimizing fueling, ignition timing, boost control, AVCS operation, and overall engine performance.

Whether you're improving your stock STI, installing full bolt-ons, or upgrading to a larger turbocharger, our staged calibrations focus on responsive power delivery, consistent drivability, and reliable performance.

All remote calibrations require a compatible Tactrix OpenPort interface, EcuFlash software, and a supported datalogging solution.

Two tuning revisions are included with each stage.

Stage 1 – Stock Turbo / Stock Hardware

Mod Requirements:

• Factory EJ257 2.5L turbocharged engine.
• Factory STI turbocharger.
• Factory intake and fuel system.
• Factory boost control configuration.
• Cat-back exhaust is acceptable.
• 91 or 93 octane fuel.

Designed for otherwise stock STIs looking to improve boost delivery, throttle response, and overall engine performance without extensive hardware modifications.

Stage 2 – Full Bolt-On Calibration

Mod Requirements:

• Factory STI turbocharger.
• Performance intake (manufacturer and model must be specified).
• Upgraded exhaust system.
• Upgraded intercooler recommended.
• Compatible aftermarket boost control solenoid is acceptable.
• Fuel system upgrades as required by the combination.
• 91 or 93 octane fuel.
• Stage 2 is intended for full bolt-on STIs retaining the factory turbocharger. Calibration adjustments accommodate increased airflow, revised boost control, and the vehicle's specific modifications.

Customers must provide their exact intake, MAF housing, and boost control solenoid configurations before tuning begins.

Stage 3 – Upgraded Turbo Calibration

Mod Requirements:

• Compatible upgraded turbocharger, including 18G, 20G, or similar supported bolt-on configurations.
• Performance intake.
• Upgraded exhaust system.
• Upgraded intercooler.
• Fuel injectors appropriately sized for the intended power output.
• Upgraded fuel pump capable of supporting the intended fuel demand.
• Compatible electronic boost control system.
• 91 or 93 octane fuel.

Stage 3 is intended for STIs equipped with an upgraded turbocharger and the supporting modifications necessary for increased airflow and boost pressure.

Fuel Injector Requirements:

Injector sizing must be appropriate for the selected turbocharger, fuel type, and horsepower goals. Customers must provide the injector manufacturer, part number, flow specifications, and applicable calibration data for aftermarket injectors.

Unverified or no-name fuel injectors are not supported.

Larger turbocharger applications, external wastegate configurations, and extensively modified engines may require additional calibration work or a separate custom tuning service.

Required Information Before Tuning

Customers must provide:

• Vehicle model year and market (USDM/JDM).
• Complete modification list.
• Turbocharger manufacturer and model.
• Fuel type and octane rating.
• Fuel injector manufacturer, model, and specifications.
• Fuel pump and fuel pressure regulator configuration.
• Intake and MAF housing specifications.
• Boost control solenoid configuration.
• Engine internal modifications, if applicable.
• Original ECU ROM file.

Any nonstandard MAF or MAP sensor configuration must be disclosed before purchase. Manufacturer calibration data may be required.

Remote Tuning Requirements

Remote tuning requires a compatible Tactrix OpenPort interface, EcuFlash software, and the ability to read, write, and datalog the vehicle's ECU.

Customers must submit their original ECU ROM file and order number to Michael.Leto@lrwtuned.com after purchase.

Two calibration revisions are included with each stage. Additional revisions, hardware changes, or diagnostic work may incur additional charges.

Important: These calibrations are developed for the specified hardware combination. Vehicles must be mechanically sound and free of boost leaks, fueling issues, misfires, and existing mechanical problems before tuning begins.

Vehicles with JDM EJ207 engines, standalone engine management, extensively modified engine configurations, or unsupported ECU software require approval before purchase.

Please review our Pre-Tune Checklist before beginning your tuning session.