iRacing Setups

iRacing setups work differently from LMU — and it’s worth understanding why. iRacing’s native setup format (.sto) is encrypted by the sim, so no external tool can generate one. Braking Lab doesn’t pretend otherwise: you upload the garage export (.htm), and remixes come back as a garage recipe — the exact changes to apply in-sim. You hit Save As, and iRacing writes the .sto itself.

Setups is in Public Beta and requires a personal Plus or Ultra plan. A Team seat alone does not grant access.

1. Export Your Setup from the Garage

The export is the human-readable setup summary — the .htm file iRacing writes itself, with every garage setting and its display value.

1. Load the setup you want in the garage. That screen has three buttons: Export, Save and Delete.
2. Click Export. The “Export Car Setup” window opens, with the file type Car Setup Exports (*.htm).
3. It saves to Documents\iRacing\setups\<your car>\, named after the setup you had loaded.

The Setup Interview is Le Mans Ultimate only. On iRacing, the flow always starts from your own export and produces garage recipes rather than generated files.

2. Upload It to Your Vault

In Setups, click New setup and drop the .htm (or .html). Braking Lab parses it into a full parameter tree and stores it as version 1, the baseline.

The file can be up to 1 MB and contain up to 512 parameters. You can upload up to 120 setups per hour, with at most 10 in a quick burst.

You can also choose its intended session type and personal tags while uploading. They organize the setup and all its versions without changing the export — see Types and personal tags.

The encrypted .sto is not an accepted Setups upload. Keep it in iRacing’s My Setups folder; upload the matching readable garage .htm export when you want Braking Lab to parse or remix the setup.

A new export is a new setup. Every upload creates a new setup, and an iRacing export cannot be appended to an existing one as a version. To keep one lineage, let your engineer remix the setup and apply the recipe in the garage.

3. Remix It

With your AI client connected (see Remixing setups), describe what the car is doing:

“I’m loose on corner exit at Spa — calm the rear without killing my straightline speed.”

Your engineer changes only adjustable values and saves the result as a new version. A remix changes at most 8 parameters; one or two per hypothesis is the recommendation.

4. Apply the Recipe in the Garage

A remixed iRacing version is a recipe, not a file. In your vault, the version shows an ordered list of changes:

LEFT REAR → Spring rate: 1100 lbs/in → 1050 lbs/in
REAR → Wing angle: 6 → 7

1. Load your base setup in the iRacing garage (the version the remix started from).
2. Copy the recipe with the Copy button — it produces a plain-text checklist.
3. Apply each change in the garage, section by section.
4. Save As with a new name — iRacing writes the .sto.

Units

A recipe uses the units of the export you uploaded. iRacing writes its export in your metric or imperial preference, so a setup exported in kPa gets recipes in kPa. Braking Lab never converts between units, for example psi and kPa. If you change your unit preference in iRacing later, the recipe keeps the units of the original export.