Which car exactly? The engine shutdown detection can change a lot between makes/models. Ive been tinkering with these settings and been using them in my 2024 Mercedes Vito for months now:
Start voltage: 14.0V
Delayed start voltage: 13.3V
Delayed start voltage delay: 30s
Shutdown voltage: 12.7V
The input voltage needs to rise either above 14.0V or 13.3V but for over 30s to assume the engine running. Once its “running” then the voltage falling to 12.7V will stop it again, but with a power ramp. The orion will lower its input current to keep the input voltage at 12.7V. If the input current falls to 0A then the engine is assumed stopped again.
Modern alternator will vary their output voltage, so its good to go on a drive with you as the passenger and observe how the input voltage reacts to the driving situation. For me, stepping on the gas means the voltage falls to 12.4V while coasting means it will rise to 14.5V, all very quickly