SUBARU WRX & STI / CUSTOM E-TUNING
Work directly with Keith Fields on a custom Subaru WRX or STI e-tune, developed through datalogs and revisions for your hardware and fuel. I have tuned Subarus since 2005. Choose your engine generation below, or ask about your setup before ordering.
No payment required to ask. I’ll reply by email; an inquiry does not place an order or book a session.
Single-fuel Accessport custom tunes are $400; flex-fuel Accessport tunes are $600. Choose your generation to check requirements and documented results.
START WITH YOUR SUBARU
Choose your engine generation to check equipment, fuel and logging requirements. Single-fuel Accessport tunes are $400 and flex-fuel tunes are $600, with up to eight revisions for most custom e-tunes. Standalone custom tuning starts at $500, with compatibility and scope confirmed for your project. Atlas and in-person projects are quoted individually.
FA24 WRX tuning for your fuel and hardware. See equipment requirements and the separate development histories of James’s WRX and Cinderelli.
Explore FA24 WRX tuning →See the development: James’s 2024 WRX, dyno records & track footage →
VA WRX e-tuning for your specific combination. Confirm hardware, fuel, device and logging needs before ordering.
Explore FA20 WRX tuning →Explore a built-engine example: Chris’s 2016 WRX with IAG & Kelford hardware →
EJ Subaru tuning with specific preparation and wideband datalogging guidance. Discuss your current flex-fuel hardware and calibration before making changes.
Explore EJ WRX & STI tuning →See a stock-turbo example: Chris’s 2020 STI, flex fuel & first-drive video →
Allow up to one business day for each ready-to-review step once payment, required information and usable logs are received. The complete tuning timeline depends on your car and the requested checks. Hardware, licenses and in-person sessions are separate.
For supported FA20 and FA24 WRXs, I offer both tuning routes. Atlas uses its own software and compatible interface; Accessport maps and hardware are not interchangeable. I’ll review your current tune, equipment and goals before recommending a platform change.
WRX & STI / FROM MY DYNO ARCHIVE
My Subaru work spans FA24 WRX development, EJ STI builds and standalone engine management. These examples show how the tune follows the car’s hardware, fuel and intended use.
An extensively developed WRX, with dated pump-gas and ethanol dyno records and an original 2026 comparison chart.
Explore Chris’s 2016 WRX and dated dyno records →
Watch Chris’s first-drive reaction and follow his STI from its April pump-gas record to its May E75 session. The original turbo stays part of this documented bolt-on example.
See Chris’s STI, customer video & dyno records →
A staged FA24 project with a 424 hp July 2025 comparison and a later May 2026 six-speed report listing 441.3 hp with WCF correction. Follow the original reports, workshop photos and owner track videos.
This progression involved upgrades as well as calibration. It is not a tune-only gain on unchanged hardware.
Read James’s WRX development record →
The January 6, 2025 E80 report records 564.5 hp and 550.2 lb-ft. The Rallispec engine, Kelford cams and EFR 7670 build pairs performance with smooth response and selectable power delivery.
This is a standalone Emtron project, with its own scope beyond a factory-ECU e-tune.
Explore Lucas’s STI and dated dyno results →
The featured E70 combination records 388 whp and 417 wtq. A separate April 15, 2025 report documents an earlier stage at 371.5 hp and 411.8 lb-ft.
The two records describe different development stages, not a controlled fuel-only comparison.
See the Cinderelli build and supporting history →
My personal Subaru development car, with original archive photos and the hardware and tuning history behind its different stages.
Explore my STI and its development history →Historical work from my time at AWD Tuning. Dyno type, correction, hardware, fuel and test conditions affect the figures. Each linked build explains its sources and context; these results are examples, not promised output for your car.
REAL CARS / REAL CALIBRATION
Watch the builds behind the results, then explore the details or talk with Keith about your own car.
2018 STI · EMTRON
Rallispec engine, EFR 7670 and three SI-Drive power modes. AWD’s January 2025 feature explores the combination behind the driving experience.
Original footage: AWD Tuning · optional sound captions
2024 WRX · COBB
The June 2025 development chapter: front-mount intercooler, charge pipes, intake pipe and custom calibration. This footage predates the May 2026 results.
Original footage: AWD Tuning · optional sound captions
2004 WRX · LINK G4
Flex-fuel calibration on Link management for this autocross WRX. See the dyno session and explore standalone tuning for your own project.
Original footage: AWD Tuning · optional sound captions
Watch here with optional sound captions, or open the original social posts. Plates and report identifiers are blurred where present; dyno data is unchanged. Results belong to the individual vehicle and test conditions.
Before your first logging session, read the Subaru datalogging parameter guide (PDF) and the vehicle preparation checklist. I confirm the channels and equipment for your exact ECU and setup.
An e-tune is developed remotely through requested datalogs, driving feedback and calibration revisions. A dyno session brings the car and suitable equipment together at an agreed facility. If the car has unresolved faults or cannot provide the required data, we discuss the checks needed before tuning starts.
Send the model year, transmission, market, modifications, fuel, device details and current concerns. If you use EcuFlash, RomRaider or Atlas, tell me your ECU/ROM and interface so I can assess support.
EJ remote tuning requires an external wideband and an approved way to record AFR or lambda alongside the engine log. A gauge display alone is not enough. The 2015–2017 FA20 WRX also requires an external wideband for remote fueling work; check your generation’s guide before buying equipment.
Request a Subaru setup review ↗EXPERIENCE / ORIGINAL INDUSTRY SOURCES
I began custom tuning in 2005. These original industry articles provide context for my AWD Tuning background alongside the individual projects shown here.
These are historical references to the work and shop background, not a statement of current dealer status or an endorsement of today's services. For my role, training and the wider project history, read Keith Fields's background and original sources.
Choosing a service? Compare base maps, custom tunes and retunes, including what to check before comparing dyno results.
Equipment & preparation · Accessport flashing & logging
A single-fuel Accessport custom tune is $400; a flex-fuel Accessport custom tune is $600. Both include up to eight revisions for most setups. Hardware and licenses are separate. Choose EJ WRX or STI tuning, 2015–2021 FA20 WRX tuning or 2022+ FA24 WRX tuning to review requirements before checkout. Standalone custom-tuning services start at $500; additional integration work and in-person sessions are quoted for the project.
A remote WRX or STI e-tune does not require a visit to my location. You need a supported tuning platform, a mechanically sound car and the logging equipment for your setup. If you prefer in-person tuning, I offer Orange County road tuning by arrangement and coordinated dyno sessions and travel tuning. Send your location and facility details before booking.
A custom e-tune is developed through the agreed logging and revision process for your vehicle. An OTS map is intended for a specified combination. I offer custom tuning based on your individual setup.
Custom e-tunes include up to eight revisions within the approved scope. We use them to evaluate the requested logs, adjust the calibration and confirm the result. They are an allowance, not eight mandatory rounds: a mechanically sound, consistent setup may need fewer. Mechanical faults, changing parts or fuel, and incomplete logs can require additional work. I discuss any added scope before proceeding.
Same-day delivery is often possible. Allow up to one business day after the required information, usable logs and any applicable payment are received. Business hours are Monday–Friday, 8 a.m.–6 p.m. Pacific. This applies to each ready-to-review step; completing the whole tune depends on your car, logging and feedback.
Use your private order page for calibration downloads and instructions. Open Messages, logs & revision history from that page to send the requested logs and feedback and follow the revision sequence. Keep your order link private. If you cannot find it, email Keith with your order reference so I can help.
Your completed calibration is for the agreed hardware and fuel. Contact me before changing that combination or ECU software; do not assume the existing file covers the new setup. Send your previous order, current file and planned changes. Retune services are available for existing Keith calibrations, with eligibility, scope and any additional cost confirmed before work starts.
If you notice a new running problem, describe the symptoms and any warning lights through your private order page or email Keith. Ask which checks or logs are needed before collecting another full-load log. A mechanical repair and a calibration revision address different problems.
The $50 base map service supplies a starting calibration for approved use and an agreed combination. It is not a completed custom tune; follow-up work is scoped separately.
Yes. Send your location and facility details to discuss an in-person session or worldwide travel tuning.
Subaru dyno and travel tuning → · COBB Green Speed guide → · Tuning build examples →
ORANGE COUNTY, CALIFORNIA
I offer Orange County road tuning by arrangement. We coordinate the setup, schedule and vehicle handover beforehand; plan to leave the car with me for the day and arrange transportation.
Plan an Orange County tuning session →ASK KEITH / NO PAYMENT REQUIRED
Four details are enough to start. Ask about your setup, choosing a service or planning your next upgrade. You do not need a complete parts list to get in touch.
I’ll reply to your email to discuss the next step. Sending this inquiry does not place an order or book a session.
Ready to order? Start custom e-tune checkout →
Prefer a conversation? Call Keith: (714) 367-4201.