Weather Station
Type a location and fetch — temp, humidity, barometer, elevation and wind fill in automatically and stay editable.
Use a trackside weather meter for best results. If pulling from a weather app, keep Sea-level corrected selected and enter track elevation.
Run Log
| Date | ET | Δ Pred | MPH | 60ft | DA ft | Temp | RH% | Baro | Grains | Wind | Trk°F | Notes |
|---|
Every logged run is checked against what the app predicted right before that run — the Δ Pred column and Model Accuracy tile track how close the calls are getting. Runs logged before this feature show —. The data model fits ET vs density altitude across your log — the more runs, the sharper the prediction. Chart: ET vs DA with fitted line.
Computed Air
Density altitude is the single best summary number — it rolls temperature, pressure, elevation and humidity into “how high the engine thinks it is.”
Full air analysis (density, dew point, grains, HP correction…)
Combo Setup
Advanced tuning coefficients
Set the track heading (compass direction the car travels) and fetched wind auto-splits into head/tail component — no guessing at the flags.
Induction sets how sensitive the combo is to air — boosted cars self-correct for thin air, NA cars feel all of it. The advanced coefficients are tunable once you have data; leave track temp at 0 until the log shows a trend.
Baseline Run
No baseline yet — log a pass below and it fills in automatically.
The baseline is your reference pass — every physics prediction scales off it. In Auto mode it follows the last run you log; tap ★ on any logged run to baseline that pass instead.
Parameters In The Model
| Parameter | Effect on ET | How it's handled |
|---|---|---|
| Air temperature | Hot air = less oxygen = slower | Density + HP correction |
| Humidity / dew point | Water displaces oxygen | Vapor pressure subtracted from dry baro; grains shown for methanol tuning |
| Barometric pressure | Higher = denser air = faster | Station or sea-level corrected input |
| Elevation | Thinner air up high | Folded into density altitude |
| Wind | Headwind slows, tailwind helps | Direction-weighted, tunable coefficient |
| Track temperature | Traction window — nonlinear | Optional linear coefficient, logged per run |
| Induction type | Boosted combos shrug off bad air | Sensitivity multiplier on air correction |
| 60-ft times | Launch consistency check | Logged per run for diagnostics |
Now live: location-based weather fetch (Open-Meteo model + precise elevation) with auto head/tail wind split via track heading. Future candidates for the full build: on-site weather-station hardware feed, auto-refetch on a timer, tire pressure & compound, converter/trans temp, throttle-stop timers, fuel specific gravity, lane-by-lane track prep history, and per-car profiles with cloud sync.