CUSTOM REMOTE TUNING WITH KEITH FIELDS

2002–2014 WRX & 2004–2021 STI E-Tuning

Subaru roots. A tune for your particular EJ.

My Subaru work began in 2005. I bring that experience to your engine, turbo and fuel-system combination, with attention to transient response, usable power and how the car needs to perform.

$400 for most setups · Eight revisions included

Review my setup ↗

Compatibility and scope confirmed before payment. See the process →

BEFORE ORDERING

Start with the right information.

Vehicle and tuning tools

US-market 2002–2005 WRX EJ205, 2006–2014 WRX EJ255 and 2004–2021 STI EJ257 are the core applications here. Engine, ECU, wiring and transmission swaps require individual review. Supported COBB and open-source workflows depend on exact ROM and software compatibility.

Your hardware and fuel

Stock-location and rotated turbos, built engines, injectors, fuel pressure regulation and boost-control changes all affect the plan. Include exact parts and fuel, plus tire, suspension and intended-use details where relevant.

Logging and mechanical readiness

For 2017-and-earlier WRX/STI custom e-tunes, an external wideband and an approved way to record its data are required for remote fueling work. For 2018+ STI applications, I confirm requirements separately. Legacy flex-fuel kits also need a software, wiring and controller review; old hardware does not guarantee current COBB editability.

Known misfires, leaks, warning lights or other mechanical issues need to be disclosed. I may request checks before tuning proceeds. Collect logs only as instructed in appropriate, controlled conditions.

Wideband logging FAQ · COBB Green Speed and compatibility

WHAT TO EXPECT

One setup. A clear tuning process.

Setup review: send your vehicle, parts, fuel and goals. I confirm the supported workflow, price and scope.
Invoice and onboarding: pay your customer-specific QuickBooks invoice after approval, then receive instructions.
Log review and revisions: return the requested data and driving feedback in the same email thread. I use that information to develop the calibration.
Completion: follow the instructions supplied with your final file. A base map or intermediate revision is not a completed tune.

Eight revisions for most $400 e-tunes

The included revisions develop the calibration through the agreed datalog process. Downloading a file again does not count as a revision. Hardware or fuel changes, diagnostic work and additional revisions may require a revised scope agreed before work continues. I confirm what your build needs before payment.

Usually same day. Within one business day.

This applies to initial file delivery and each agreed revision once setup approval, payment and all required details or logs are complete. Business hours are Monday–Friday, 8 a.m.–6 p.m. Pacific. Requests outside these hours begin the next business day. Time collecting logs or resolving vehicle issues is separate; this is not a promise to finish the whole tune in one day.

EXPERIENCE YOU CAN EXPLORE

My white 2015 STI

Follow the development of my personal STI through its hardware and engine-management history. For another approach to a responsive street-oriented STI, explore Lucas’s Emtron build.

Explore the build history ↗

Lucas’s STI: the driving experience · Meet Keith

Base map, OTS or custom e-tune?

A $50 base map is a starting calibration for approved use, with scope confirmed first. It is not a finished tune or permission for full-load driving.

This service does not offer universal EJ OTS maps. A custom combination needs an individual review.

A custom e-tune develops your calibration from the agreed logs and feedback. Tell me how you want the car to behave, including response, power delivery and intended use.

Start my setup review ↗