Boostline

Data logger for BMW engines

Live data, logging, road dyno and drag timing for your BMW, on iPhone and iPad. Free, with no ads, no accounts and no tracking.

Available on the App Store

Live dashboard with engine speed, boost, lambda and rail pressure tiles

Road dyno result with peak power and torque curves

Drag result: 0-100 km/h time with 10 km/h splits

Log graphs with full-throttle pulls found automatically

What it does

Live

A dashboard of value tiles, with actual and target side by side for boost, lambda, rail pressure and more, and live graphs below.

Logs

Capture logs to CSV with one tap. They are saved in the Files app, ready to share with your tuner.

Analyze

Graphs with full-throttle pulls found for you, log comparison, and heatmaps of boost, lambda, rail pressure and timing.

Road dyno

Estimated engine and wheel power and torque from a pull, using your car's weight and the weather. Save runs and overlay them.

Drag timing

0–100 km/h, 0–60 mph, 100–200 km/h, 1/8 and 1/4 mile and more, with splits and gear changes. The car's speed reading can be calibrated against GPS.

BMW DME data

Hundreds of extra measurements from BMW's own engine tables: boost target, wastegate, per-cylinder timing, VANOS and more. How to set it up

What you need

A BMW. With the BMW DME data, B38, B48, B58, S58, S55, N55, N20, N54, N63 and S63 engines get the full set of measurements; other cars get the standard OBD-II channels.
An MHD WiFi adapter or a bootmod3 WiFi adapter plugged into the OBD port. Boostline joins its WiFi network and reads data through it.
An iPhone or iPad with iOS 15 or newer.

Boostline only reads data. It doesn't flash, code or change anything in the car. Dyno and drag runs belong on a closed course or a dyno, never on public roads.

On iPad

The same app, with more room: in landscape it shows the full layout with graphs and setup side by side.