# Lap Comparison

> How to compare laps side by side to find where you gain or lose time on track.

**Lap Comparison** is one of the most powerful analysis tools in Braking Lab. By comparing two or more laps side by side, you can pinpoint exactly where you're gaining or losing time — down to individual braking zones.

## Starting a Comparison

To compare laps:

1. Open a session from the [Sessions](/en/docs/telemetry/sessions-laps) view
2. Select the laps you want to compare (2 to 5 laps)
3. The comparison view opens automatically

You can compare laps from the same session or across different sessions, as long as they're on the same track and car combination.

## Comparison View

### Delta Bars

The delta display shows the time difference between laps at each point on track:

- **Green bars** — You were faster in the selected lap
- **Red bars** — You were slower in the selected lap
- **Flat line** — Identical pace at that point

### Corner-by-Corner Breakdown

For each corner, the comparison shows:

| Data | Description |
|------|-------------|
| **Time delta** | Difference in sector/corner time between laps |
| **MRP delta** | How brake pressure differed |
| **Entry speed delta** | Speed difference at corner entry |
| **Exit speed delta** | Speed difference at corner exit |

This tells you not just *where* you lost time, but *why* — was it braking too early, too hard, or carrying less speed?

## Available Channels

The comparison can display multiple data channels:

- **Speed** — Velocity trace through the lap
- **Brake pressure** — Brake application over the lap
- **Throttle** — Throttle application trace
- **Lateral G** — Cornering force
- **Longitudinal G** — Acceleration and braking force

## Saved Comparisons

Save a comparison for later reference:

1. Set up the comparison you want to keep
2. Click **Save Comparison**
3. Give it a name (e.g., "Spa T1 improvement" or "Old vs new line")
4. Access it later from the **Saved Comparisons** list

Saved comparisons are useful for:

- Tracking your improvement over time
- Sharing insights with your Race Engineer AI
- Quickly revisiting key analysis sessions

## Tips

- **Compare your best and worst laps** first — this reveals your biggest improvement areas
- **Focus on corners with large deltas** — small deltas across many corners may be less actionable than one big deficit
- **Look at entry speed AND MRP together** — a faster entry with similar MRP often means better brake point, not just more risk
- **Compare across sessions** — comparing last week's best to this week's best shows real progress

## Next Steps

- [Scoreboard](/en/docs/telemetry/scoreboard) — See how your laps rank overall
- [Coaching Reports](/en/docs/telemetry/coaching-reports) — Get AI analysis of your driving patterns