If the Race Engineer tab is open but not showing any live data during a session, the telemetry connection between GO Fast and your sim is not established. Work through the steps below for your specific sim.
General checks first
Make sure GO Fast is open and you are on the Race Engineer tab before or during your session. The connection is established when you enter a session in your sim, not from the main menu.
iRacing
iRacing telemetry is enabled by default. If it is not working, activate telemetry with ALT+L and make sure you are in an active session (not the garage menu).
ACC
GO Fast uses the broadcasting.json file, located at:
Documents\Assetto Corsa Competizione\Config\broadcasting.json
Make sure this file exists and is not corrupted. Close ACC completely before launching GO Fast for the first time. If you make any changes to broadcasting.json, restart ACC for the change to take effect.
LMU
LMU requires a shared memory plugin. GO Fast installs this automatically, but if it was removed or is missing, GO Fast will prompt you to reinstall it. See Race Engineer Is Not Detecting My LMU Sessions for a detailed step-by-step guide.
Need help?
If you are still experiencing issues, check the Troubleshooting section for common solutions. If you cannot find what you are looking for, open a support ticket and our team will help you out.