New car starts with no logged runs. Track list is shared across all cars.
// Import CSV
How should this import be handled?
// Confirm Replace
This will permanently delete all logged runs for this car and replace them with the imported data.
This cannot be undone. Make sure you have an exported backup before proceeding.
// Rename Car
// Race Setup
// Conditions
Fields auto-populate when weather is fetched — or enter manually
Select a track to fetch live weather
Next update in —
// Prediction
// Predicted ET
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Average Across Models
—.—
—
Since Your Last Run
DA
Predicted ET
Top Weighted Reference Runs
Confidence Range— – —
Suggested Dial-In—.—
⚠ Not enough data for this track/distance. See minimum run requirements below.
// Log a Run
Setup
Conditions
Select a track and date/time to auto-fetch historical weather
Performance
// Pedal-Off ET Estimator
If you lifted before the finish line, enter your accurate splits below to calculate your true all-out ET.
1/4 Mile — enter accurate 60', 330', 660', and 1000' splits:
1/8 Mile — enter accurate 60' and 330' splits:
ESTIMATED ALL-OUT ET
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If this looks right, tap above to log it. Otherwise ignore it — it won't be saved.
// Algorithm Performance
Prediction Color Key
Green — within .010 of actual ET Yellow — within .011–.025 of actual ET White — closest prediction when none within .025
—
#
Date / Time
Track
Dist
DA
Temp
Hum%
Wind
Dial
RT
60'
330'
660'ET
660MPH
1000'
1320'ET
Calc ET
PREDICTIONS
1320MPH
Result
Lane
Quality
Ignore
Edit
Del
IDW
Hale
CSP
Avg
🏁
No runs yet. Hit "+ Log New Run" to get started.
// Your Tracks
// Add New Track
In Google Maps, navigate to the track and tap the Plus Code shown on the location card. Paste it below — the app decodes it to GPS coordinates automatically.
Track heading: The compass direction the car travels (0–360°). Used to auto-classify wind as headwind or tailwind from live weather data.
// Car Management
Each car has its own run log and algorithm settings. Tracks are shared. Switch cars here before logging runs or generating predictions.
// Prediction Algorithm
These coefficients are used by the Patrick Hale weather correction model. Each value represents how much that variable must change to affect ET by .01 seconds:
Show Suggestions
Displays recommended changes based on your run data
Every°F change= .01 ET
EveryinHg barometer change= .01 ET
EveryinHg vapor pressure change= .01 ET
Every% humidity change= .01 ET
✓ Algorithm settings saved
// Tuning Insights
Insights appear here after 10+ All Out runs are logged.
// Understanding the Variables
Temperature ↑ → air less dense → car runs slower → ET ↑ increases
Barometer ↑ → air more dense → car runs faster → ET ↓ decreases
Vapor Pressure ↑ → more moisture → air less dense → ET ↑ increases
Humidity ↑ → more water vapor → air less dense → ET ↑ increases
Default values are based on empirical data from bracket racing at Northern California tracks. Your car may respond differently — adjust manually and use the Prediction Tuning bench to validate.
// Notes
● 1/8 mi predictions use 660' ET from ALL runs (1/4 and 1/8)
● 1/4 mi predictions use only runs with a 1320' ET
● Minimum 5 runs per track to generate a prediction
● "All Tracks" mode is useful at new venues
Track names in CSV must match exactly:
⚙ Prediction Tuning
Controls how much each weather variable influences which past runs IDW uses as reference. More impact = the model requires a closer match on that variable.
More Impact
Less Impact
Density Altitude
Wind Speed
Wind Direction
Temperature
Humidity
Sun / Shade
Defines how much your car's ET changes per unit of DA and wind delta from the anchor run. Adjust until the Adjusted predictions track closely with Actual ET below.
Anchor Runs (2–5 most recent runs used as reference, weighted most heavily toward the most recent)
3
1/8 MILE
DA per 500ft
0.018
Wind per 4.5mph
0.012
1/4 MILE
DA per 500ft
0.026
Wind per 4.5mph
0.008
Run Comparison — Live Recalculation
—
—
Date
Track
Dist
DA
Wind
Actual ET
Current Pred
Adjusted Pred
✓ Saved.
⚡ Suggest tests Critical/High/Medium for DA and Wind Speed against your logged runs. It's a starting point — DA and Wind should always be at least Medium.
BETA