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Public beta · vintage Mopar ECUs

Know what’s in the BIN.

Spool puts calibration tables, curves, and maps in a modern editor for Chrysler and Mopar turbo ECUs. Inspect the bytes, make deliberate changes, and save a checksummed BIN for your flashing workflow.

Beta software. Keep your original BIN, verify table definitions and values for your ECU, and review every change before flashing. A valid checksum does not mean a tune is safe. Use at your own risk.

Download Spool 26.9.2 See the app

macOS · Windows · Linux SMEC · SBEC · LM calibration formats

Spool / timing map
Spool showing a 3D timing surface above an editable, color-coded RPM and MAP heatmap
Real app screen · archived T3 calibration example

See named functions and their source bytes

Edit curves, constants, flags, and 3D maps

Save with supported ECU checksums refreshed

What you can do

A clearer path from BIN to change.

Browse the calibration by name, see its shape, and keep the edit tied to the underlying ROM bytes.

01 / Browse

Find the right table

Open a BIN with its legacy .tbl or v2 .tpl definition. Browse category and group menus, or search table names across the calibration.

02 / Visualize

Read curves and maps

Inspect labeled 2D plots, editable values, color heatmaps, and rotatable 3D surfaces. Axes show calibrated units where the definition supports them.

03 / Edit

Change with context

Edit grid cells, curve points, constants, choices, and flags. Scale a table by percentage or offset, then review changes with Undo, Redo, and History.

04 / Rescale

Adjust a setup together

Injector and MAP sensor wizards rescale flagged tables as one operation and report which tables changed.

05 / Explore

Try an operating point

Cal Explorer shows per-table lookups for RPM, MAP, temperature, and other inputs used by that calibration, with links back to the active cells or curve segment.

06 / Replay

Work from a log

Open MPScan .mpl or CSV logs, scrub channel traces, and send a sample’s inputs into Cal Explorer.

Inside the editor

The shape and the numbers, together.

The same table can be read as a plotted response and edited as exact values.

3D timing surface and editable color heatmap in Spool
3D timing mapRotate the surface and edit the heatmap below it.
Fuel starting curve plotted above a list of editable temperature and fuel values
Fuel curveSee the response and its editable points in one view.

Screenshots use an archived T3 BIN. An archive name does not establish a factory calibration; community files can include aftermarket changes. Some historical table labels and engineering scales remain under review.

Byte-aware editing

The BIN stays in view.

Spool checks supported ECU checksum schemes, updates the checksum after an edit, and verifies table codecs against archived BIN fixtures. You can inspect changed tables before saving. Hardware flashing and live serial scanning are not part of this release.

Current beta · 26.9.2

Download for your desktop.

Choose the installer for your system. The in-app updater verifies the download size and SHA-256 before opening it.

Use at your own risk. Back up your original BIN and verify the calibration against your ECU and hardware before flashing.

macOS

Spool for Mac

Developer ID signed, notarized, and stapled DMG.

Download DMG
Windows

Spool for Windows

WLAN GEEKS LLC signed and timestamped installer.

Download EXE

Upgrading from 26.9.1 or earlier? Install 26.9.2 manually once. Older builds check the former GitHub Pages address; 26.9.2 checks this site for future releases.