BMS Pro Dial: Drag Racing Log

BMS Pro Dial is a drag racing logbook and dial-in calculator for bracket racers. Log your timeslips, and the app predicts your next ET and suggests a throttle stop from your own runs and the air you're racing in.

Who it's for:
Bracket racers running a throttle stop or stop timer. Index and ET racers who run without a stop. Jr dragster families setting ballast. Street car and test and tune racers who want a real logbook instead of a pile of slips. It works for 1/8 mile and 1/4 mile drag racing.

How it works
1. Add your car in the Garage.
2. Log each pass, or scan the timeslip.
3. Get density altitude (DA) and water grains for the current air.
4. Type a Target ET. The app suggests the stop to run it and shows the predicted ET for the stop already in the car.
The more Good runs you log, the better the dial-in gets. Early predictions are a starting point.

Dial-in and ET prediction
Predicted ET uses the throttle stop on the Home screen, current DA and your history. Suggested Stop works the other way: give it a Target ET and it gives you a stop. On a Jr dragster it suggests ballast pounds instead. Choose Stop Number or Stop Timer to match how you set the car, or turn on ET only if the car has no throttle stop. Each prediction shows Low, Medium or High confidence.
First Pass detection adds a learned first-round penalty on each race day. The air is stripped out of same-day stop pairs, so a Saturday heat-up does not get blamed on the stop. After a combo change, Set New Baseline. Old runs stay in the log but stop moving the dial.

Density altitude and weather
Type temp, humidity and baro, then tap Calculate DA. Pro pulls current weather for your GPS location with one tap and works out DA and grains automatically. DA uses your logged track elevation, which you can grab from GPS or type in. Weather data from Open-Meteo.

Timeslip scanner (beta)
Scan a paper timeslip or pick a photo of one. The text is read on your phone, not on a server. It fills reaction time, 60 foot, 330, 1/8 mile ET and MPH, 1000 foot, and 1/4 mile ET and MPH. Check Slip shows both lanes side by side, so you pick your lane, and amber marks any number worth a second look before you apply it.

Drag racing logbook
Every pass is saved with date, track, stop, weather, DA and grains. Mark runs Good, Questionable or Ignore so a pedaled pass does not move your next dial-in. If you lifted early, set Valid To, and the app can estimate the full pass from your own full runs. Filter the run log by Similar Stop or Similar Weather and view it as cards or a list. Keep several cars in the Garage, and import or export your runs as CSV.

Practice tree (Pro)
A full-screen practice tree with .400 Pro, .500 Pro, .500 Full and Instant Green. Sharpen your reaction time before eliminations, with rollout and delay box settings.

Race and shop calculators
22 calculators. Race: HP from ET, eighth to quarter mile conversion, ET change from HP and weight, ET Estimate and win in feet. Drivetrain: gear ratio and converter slip. Engine: displacement, compression, dynamic compression, carb CFM, HP and torque, pistons and rods, injector size and blower pulley ratio. Chassis: coil springs, brake sizing, a 4-link calculator with instant center and anti-squat, and scale and ballast. Shop: units, bolt torque and material weights.

Lite and Pro
Lite is free. Log, edit and export every run, enter weather by hand, scan timeslips, and use 8 calculators: units, bolt torque, displacement, compression, eighth to quarter, win in feet, converter slip, and scale and ballast. Lite predictions use your 30 most recent Good runs.
Pro is $2.99 a month through Google Play and adds:
• GPS weather and auto DA with one tap
• Predictions from your full Good history, with more weight on this race session
• The practice tree
• All 22 calculators
Cancel any time in Google Play.

No account and no sign-up. Your runs stay on your phone. Built by Brownson Motorsports.