Assetto Corsa Competizione (ACC)

Use the official guide

• Shows the correct ACC video setting (Fullscreen disabled).
• Shows the correct telemetry file path (broadcasting.json).
• Includes a OneDrive Documents note (very common cause of “file not found”).

Open the official ACC setup

This is the most accurate source if ACC updates change behaviour.

Step 1: Locate the file

1. Open File Explorer.
2. Go to:

OneDrive users: if Documents is synced, the file may be under your OneDrive Documents folder instead.^[1]

Step 2: Replace the contents exactly

Open broadcasting.json in a text editor and set it to:

After saving, restart ACC. If you edited this while ACC was running, exit the game and also restart RaceLab to apply changes.^[1]

Overlays open but show no data

• Confirm ACC FULLSCREEN = DISABLED and restart ACC once.^[1]
• Confirm broadcasting.json is in the correct Documents folder (check OneDrive Documents too).^[1]
• Confirm broadcasting.json matches the official content (port 9000 + password “asd”).^[1]
• Go on track before judging if telemetry is working.

It worked yesterday, not today

• ACC updates or other tools can overwrite broadcasting.json — re-check the file content.^[1]
• Restart order to test: start ACC → go on track → then start RaceLab.
• Temporarily close other telemetry/overlay apps to confirm RaceLab receives telemetry.