Diagnose. Log. Calibrate.
A focused workspace for your classic Subaru. Read and edit the ROM, understand your logs, and flash with pre-flight checks. Add a Customer license for qualified Live Tuning and ROM-specific custom features.
PulseWidth Classic 1.0.0 is live
Download the signed Windows release with any active account. The Free toolkit covers HC16 reading, editing, flashing, logging, and diagnostics; a paid Customer license unlocks ROM-specific Live Tuning and Launch Control where the ROM-level check approves it.
TAKE A LOOK INSIDE
Your workspace. Take it for a spin.
Base Timing
No changesSwipe to scroll. Select range to edit.
Drag a rectangle · Shift-click a range · Ctrl/⌘-click to toggle cells. Headers select rows or columns. Edits apply to the whole selection.
Gold area = selected cells · Gold marker = sample lookup
Move over the graph to follow a datapoint. Pan the timeline below to explore the rest of the log. Synthetic data; not a vehicle measurement.
Ready to scan
Run a fictional scan, or select an example from shared history.
This preview never reads, clears or changes real codes. No names, VINs, uploaded logs or account identities are stored in demo history. Real vehicle diagnostics remain separate.
Read. Review. Write.
- 1Connect
- 2Read
- 3Review
- 4Write
- 5Verify
- 6Reconnect
Try a complete read-to-write session. You control the confirmations; the demo handles the progress and log.
Read Test rom first to create a fictional recovery point.Illustrative events only · no device commands
Try the Classic editor: select a table, edit a cell, or enable simulated Live Tuning.Inspired by PulseWidth Classic, not an exact clone. All activity is simulated. Layout and features vary by ROM and license.
Adjust qualified tables with a Customer license. Check the exact-ROM selector for availability.
Read, edit, flash, log, and diagnose supported HC16 vehicles with an active account.
Vehicle profiles, saved revisions, and datalogs keep each tuning session in context.
Connect with a supported interface. No ECU removal or soldering required.
One evidence chain
From warning light to verified calibration.
PulseWidth keeps diagnosis, logging, and calibration in that order so every change starts with evidence and ends with a record you can revisit.
Read OBD-II codes, inspect freeze-frame data and readiness monitors, review learned values, and keep every finding tied to the correct vehicle and ECU identity.
Record profile-matched live channels, compare revisions, and use learned-table and MAF-rescaling views. Logs stay in the account so you can return to the evidence behind each revision.
Edit the ROM, run pre-flight checks, flash with safeguards, and live-tune qualified tables with immediate ECU feedback. Every revision remains linked to the evidence behind it.
Your vehicle history follows you.
Keep ROM backups, datalogs, and tune revisions with the vehicle they belong to. Account-backed history makes it easier to return to a previous session and keep your recovery files close at hand.
Laptop
Capture, analyze, and calibrate.
Phone
Check history and progress anywhere.
Tuner network
Connected tuner services are coming soon.
Flagship platform / 2001-2006
The 02-05 WRX era is our flagship, not an afterthought.
Vehicle-specific definitions support the GD WRX and STi, Forester Turbo, Legacy B4, and Outback H6. Flash through the stock OBD-II port, log the real channels, and live-tune supported calibrations while the engine runs.
Vehicle-specific definitions ship inside the app. The exact-ROM feature selector shows which live tables and custom features are available, while in-app checks confirm compatibility before you apply them.
Read more about how we work on the about page.
Every active account can download the signed Windows release. Free accounts receive the core HC16 toolkit; a paid Customer vehicle license unlocks Live Tuning and only the custom features approved for the exact ROM.
Follow along on the releases page.