Barometric Sensor¶
The reference atmospheric pressure the load calculations are scaled against. In Engone it is fixed at 101.3 kPa.
What it is¶
The barometric sensor measures ambient atmospheric pressure. It gives the ECU a fixed reference for "outside" pressure to compare manifold pressure against.
In the current version barometric pressure is fixed at 101.3 kPa — there is no altitude or weather setting.
Why it matters¶
- Load reference — MAP is meaningful relative to atmospheric pressure. Barometric is the baseline that distinguishes vacuum from full load and scales the load tables sensibly. Load is computed as a ratio to baro (MAP ÷ baro) rather than an absolute.
- Air density — the speed-density density term uses the baro reference.
How to tune it¶
Barometric is a reference input, not something you set.
In a real ECU
At sea level atmospheric pressure is about 101 kPa and it falls as altitude rises. Because load is a ratio to baro, a single tune behaves correctly across different atmospheric conditions — thinner air at altitude means less air mass for the same manifold pressure, and the baro reference tells the ECU so. Engone doesn't simulate altitude, so you won't see this in the game.
In the game¶
Barometric pressure underlies the load and density calculations. It's the steady "atmospheric" baseline behind the MAP readout's swing.