Race Engineer can set your pit stop fuel amount for you — recalculated every lap from live telemetry, applied only when it's safe to.
When Automatic Mode is on, Race Engineer sets exactly how much fuel to add at your next pit stop, based on your actual fuel burn — not a fixed average. It never touches steering, throttle, brakes, or any other input. Two lighter modes exist for anyone who wants the numbers without the automation: Observation, which only reads and displays telemetry, and Assisted, which recommends a fuel amount for you to enter yourself.
Race Engineer reads iRacing's telemetry SDK continuously — fuel level, lap distance, session state. Every lap it recalculates fuel-to-end from your measured burn rate and checks it against the pit window. When a stop is recommended and Automatic Mode is on, that fuel amount is sent as a pit command — but only after it clears every safety check below. This is pit automation in the narrowest sense on purpose: one number, sent once, only when it's safe to.
Automatic Mode never fires on a guess. Before sending a fuel command, Race Engineer independently checks all of the following — if any single one fails, it does nothing and logs the exact reason:
That's not a promise of perfection — it's a description of the checks the code actually runs before every command. You can always turn it off from the dashboard; automation off always means full manual control, with no in-between state.
Reads telemetry and shows the numbers. Makes no decisions and touches nothing — the safest place to start.
Surfaces the fuel and pit-window recommendation for you to act on yourself — nothing is sent automatically.
Adds the Auto Pit behavior on top of Assisted: sets the pit fuel amount for you, gated by the checks above.
Only if you turn on Automatic Mode, and only the fuel service amount for your next pit stop — never any other input. This is gated so it can only act during an actual pit stop.
Yes — it reads live telemetry throughout the session and recalculates every lap, including during a live race, not just in practice or a pre-race simulation.
Yes. Observation Mode only reads and displays telemetry, and Assisted Mode shows the recommended fuel amount without sending anything — Automatic is opt-in, not the only way to use the app.
The connection check in the safety gate fails, so no fuel command is sent — Race Engineer simply stops acting until iRacing is connected and the session is valid again.