Development History

Oct 2025

Project started

Perf board + dev board, jumper wires everywhere. First injector signal interception on the bench. ESP32-S3, MOSFET driver, potentiometers simulating RPM and throttle.

Jan 2026

First prototype running

Injector pulse width extension validated against a Dynojet Power Commander on oscilloscope. Flyback voltage from inductive load handled at the driver stage. Bluetooth app reads live data.

Apr 2026

ECU binary decoded

Community member Ross Olsen dumped the full KLX300 ECU calibration. Ignition timing analysis revealed 6° retard at WOT above 8000 RPM. Published as a Lab Report. The TPS clamping fix became a TuneFI target.

May 2026

Automotive engineer hired, PCB designed

Electronics design was out of my depth. Hired an engineer who designs ECUs for a living. He took the draft prototype and turned it into a proper PCB — clean layout, RISC-V real-time processor, automotive-grade injector driver. Manufactured by JLCPCB.

May 2026

Engineering samples on the bike

Five boards built. Two running on my KLX355 for development — one month of riding, zero issues. 30,000 lines of C firmware, 30,000 lines of tests, 92% coverage. Wideband O2 integration working. Fuel map generation from ride data.

Jun 2026

ECU sensor access via K-line

Implemented K-line protocol to read factory ECU data through the diagnostic port. RPM, throttle position, temps, manifold pressure, speed, FI codes — all on your phone. No dealer tools. No off-the-shelf scanner does this for KLX bikes.

Jul 2026

V2 validated, app live

Automotive-grade injector driver (VNLD5160), waterproof aluminum enclosure, Android app live on Google Play. Hand-built batch of five, nearly gone — three to Discord early adopters, one on my KLX355. Fueling smooth, data logging end to end.

Jul 2026

V3 hardware: TPS spoof works on the bike

The redesigned TPS-spoof circuit — the one open item from V2 — now recovers ignition timing on the bike. Firmware support is in active polish. This was the flagship capability that set the Full tier apart.

Aug 2026

In production — initial batch ordered

Wiring harnesses sourced to a factory; the device moved from engineering samples into production. First batch ordered, split Lite ($250) and Full ($350, +TPS spoof).

Sep 2026

V3 orders opened — 19 riders in

Ordering opened and the first production batch started allocating: nineteen riders ordered V3 hardware — Lite and Full — spread from the US to Japan and Singapore.

Sep 2026

First units dispatched

First V3 units are on their way to riders, tracked end to end. While the boxes were in transit, a minor firmware update shipped over the air; every device pulls it from the app on first start.

Sep 2026

The loop closes: Studio, shared maps, iOS

TuneFI Studio launched — upload ride logs in the browser, set AFR targets, download a corrected map for the device. The first shared fuel map came from community member Colin: logs from his wideband-equipped KLX300, Studio did the job. The iOS app reached TestFlight, putting the full platform on both phones. Ride, log, tune.