TrackTune Lap Timing

By default, the lap timer times laps by itself from GPS, with nothing to press. Once you drive back past a straight you went down earlier, it makes that the start/finish line, counts that lap, and times every lap after it. Delta compares where you are now with the best lap at the same spot.

Add Lap timer to a custom dashboard, then select it to change its controls. TrackTune must be installed on the car; follow get started with TrackTune.

Configure the timer

• Lap timer: Layout is Stacked, Side, or Row. Big reading is the running Lap, Delta, Last, or Predicted.
• Show: Last lap, Best lap, Delta to best, Predicted lap, Lap count, Status (no GPS, finding line, timing), Labels, and Light up after a lap or sector, and a new best.
• Sectors: 2 to 6 Sectors (3 by default), and the cards Sector time, Sector delta to best, Last sector, Last sector delta, Optimal lap, Optimal lap vs best, and Speed delta to best. All are off by default.
• Delta bar: Bar is Off, Above, Below, or Only, a bar that fills the whole widget. Shows is Lap delta or Sector delta. Full at sets the range, 0.25 to 10 s.
• Decimals: 0 to 3 each for Lap times, Running lap, and Delta. Lap times are cut, not rounded, like a stopwatch.
• Card plates: Opacity, Radius, and Outline.
• Colors: Values, Labels, Line set, lap done, Faster, Slower, New best, and Cards.

Compare laps and sectors

The car splits your best lap into equal sectors by distance, with nothing to mark. Each lap is timed sector by sector against your best time for each one, and the optimal lap adds up your best sectors. A new best lap moves the sectors to its own distance and starts the best sectors over from it. The car keeps every count from 2 to 6 at once, so switching between dashboards with different sector counts never loses your best sectors. Speed delta is your speed now against your best lap’s at the same point: positive is faster.

The delta bar is centered on zero. It fills toward the faster side as you gain on your best lap and toward the slower side as you lose, full at the range.

Place a start/finish line

In the course map editor, open Start / finish and choose Place start/finish line. Click its center on the map, then drag it into position. Set its width and the driving direction shown by the arrow. This manual line controls lap timing; Use automatic detection restores the automatic behavior. Save and install the dashboard to use that choice in the car.

The first crossing in the chosen direction, inside the line’s width, starts the first lap. Later crossings complete laps; reverse crossings and crossings outside the line do not count. Changing the timing line clears the lap history and best-lap reference, so set it before your session.

Start/finish lines on the recording stick

A recording stick can list up to 16 start/finish lines, one per track you drive. While the stick records, the car watches all of them while continuing to use your dashboard’s manual line, or automatic detection if you have not set one. A line becomes active only when you cross it in its direction, inside its width. That crossing starts lap timing, and the line stays active for the rest of the drive. If you cross none of them, your dashboard’s existing timing choice stays in use.

An active stick line overrides the line placed by hand on a dashboard’s course map, and the dashboard’s map draws the stick’s line. When recording ends, the dashboard’s latest choice returns. Switching to a different line clears lap history. Stick lines need FastData 1.1.4, included in ScreenTune 1.1.2, or later; on older recorders a file with lines is rejected whole and only the JSONL file records.

Sectors remain automatic equal-distance sections of the best lap. Choose their count on the dashboard; the recording-stick file does not define sector boundaries or a sector count.

GPS limits and preview

The status reads no GPS, finding the line, waiting to cross it, or timing. Lap timing depends on GPS fix quality, sample rate, and the start/finish crossing. Decimal places control the display; they do not establish measured timing accuracy.

In the builder, the Live drive preview never comes back around, so the timer stays at finding the line. Use Spirited, which drives a circuit, to see laps.

More presets in Laps use the lap timer: Lap strip (lap, last, best, and delta in one row), Delta bar (the live delta, big, over the bar), and Sector strip (lap, sector time, sector delta, last sector, and optimal lap in one row). Sector time, Sector delta, Last sector, Optimal lap, Optimal vs best, and Speed delta are number widgets on single lap readings.

Readings for other widgets

Use a number, bar, or other widget to show Current Lap Time, Last Lap Time, Best Lap Time, Lap Delta to Best, Predicted Lap Time, Laps, Current Sector, Sector Time, Sector Delta to Best, Last Sector Time, Last Sector Delta to Best, Optimal Lap Time, Optimal Lap vs Best, and Speed Delta to Best.

Results last for the session, including switches to CarPlay or Android Auto. Switching the car off for at least 5 seconds starts a new session. See dashboards and widgets for what the car needs and session readings.