freetrackiRacing supports head tracking natively through the Freetrack protocol. The game will automatically detect the head tracking input once LookPilot is running.
Reported by several iRacing users, and iRacing's fast cameras amplify it. Work through the jitter checklist below, then keep overall sensitivity low - iRacing rewards the subtle setup described above more than any other sim.
Shaky or twitchy tracking is the most-reported issue across all games, and it almost always traces to the camera picture, not the game:
Press Alt+C (default) to recenter tracking on your current head position at any time - do it once seated in your normal driving position, looking at the center of your screen. If you find yourself recentering constantly, move the webcam so it faces you head-on (an off-axis camera makes turned positions read as drift) and recenter while looking at the horizon in-game, not at the camera.
If your wheel or stick misbehaves while LookPilot runs (stiff force feedback, lost input), make sure the output protocol is freetrack rather than virtual joystick - the virtual joystick device can conflict with some wheel drivers. iRacing reads the FreeTrack protocol directly, so the virtual joystick is not needed.
Is head tracking allowed in iRacing? Yes - iRacing supports TrackIR-protocol head tracking natively; it is a normal, widely-used accessibility and awareness aid in official racing.