Lap Companion for GT7

What's here

• Time trials: the time trials running now, with where the gold, silver and bronze times are likely to end up, and a reference lap (a top lap, named by its driver) to compare your laps with.
• Daily races: a fast lap for each of this week's daily races, to compare your laps with.
• Past trials: how earlier time trials finished, and how close the predictions were.
• Super License: a gold-medal run for each test, to compare your runs with.
• Top drivers: the most consistently fast time trial drivers.
• Audio cues (Android app): beeps that count you down to the reference's braking points while you drive.

Record your laps

GT7 sends live data (telemetry) to your home network while you drive. The app, or the recorder on a computer, saves it, and this site compares it with the reference lap. The phone or computer must be on the same Wi-Fi or network as the PlayStation, and only one telemetry app can listen at a time: close SimHub or similar apps first.

With the Android app

1. Start GT7 and go to the time trial or license test.
2. In the app, tap Record on this phone under that event or test. The app finds your PlayStation by itself; if it can't, it shows what to check and lets you type in the PlayStation's address.
3. Drive. Every complete lap is saved, so drive as many as you like: there's no need to restart between them. Recording carries on with the phone locked.
4. Tap Stop and compare. Your fastest lap is shown first; tap any other lap to compare it instead. Save to Downloads keeps the file.

With a computer

1. Download the free recorder: for Windows or Mac (Apple silicon), ready to run, or the Python script for any computer with Python. See how to record.
2. Start it (double-click), then drive as many laps as you like. Press Ctrl+C when you're done: it saves a .csv file next to itself.
3. Upload the file under the event or test. It's read in your browser and isn't uploaded anywhere.

A time trial's reference is a top lap, usually the world record when it was recorded, named by its driver. The record can fall after that, so the current one may be faster. A daily race's reference is a fast lap from that race, and a Super License reference is a gold-medal run.

Read the comparison

Audio cues (Android app)

While you record, the app can play a countdown to each point where the reference lap brakes or lifts, and a beep just before it gets back on the throttle: brake on the BEEP. They follow the reference's line, and go quiet when you're well off it, reversing or stopped.

1. On the Audio cues tab, listen to the sounds so you know them in the game.
2. Tick Audio cues next to Record on this phone, and record as usual.
3. If the cues seem early or late, calibrate your phone speaker, headphones or Bluetooth device on the Audio cues tab: about 20 seconds, sitting in the car.

The phone speaker and wired headphones give the steadiest timing. Bluetooth adds a delay that can vary.

About this project

A free hobby project for GT7 time trials and Super License tests. It relies on community work: the drivers whose laps are the references, and the people who decoded GT7's telemetry. If you find it useful, consider supporting a GT7 creator you enjoy.

I built this with an AI coding assistant, Claude, which wrote all of the code. The ideas, testing and decisions are mine.

Android app (test)

The Android app is this website plus recording on the phone: no computer needed. It's in a closed test on Google Play, and anyone can join:

1. Join the testers' group: groups.google.com/g/time-trails-gt7-testers (with the Google account you use for the Play Store).
2. Then become a tester and install: play.google.com/apps/testing/io.github.gt7timetrials.

After you become a tester, it can take a little while (sometimes up to a few hours) before the Play Store lets you install. If it says the app "cannot be downloaded", try again later.

Feedback is very welcome: use the private feedback on the app's Google Play page, or reply in the Reddit thread or the GTPlanet thread. Please keep the app installed for a couple of weeks: Google needs 12 testers for 14 days before it can go public. The app collects nothing (privacy).

What the numbers mean

• Gold is the world record + 3%, as in the game. Silver is +5% and bronze +10%.
• Predicted gold is where the gold time is likely to end up when the event closes. The world record usually keeps falling for the first week, so gold gets harder. The range covers 8 out of 10 past events.
• Entrants is everyone who has set a time so far, PS4 and PS5 combined.
• Safe target beats the fast end of the predicted range. In 9 out of 10 past events the final gold time was slower than that.
• Course difficulty is how far 100th place is behind the world record: the bigger the gap, the harder the course is to master. It's rated against all past events: Easy is the closest quarter, Medium up to 70% of them, Hard up to 90%, and V.hard (very hard) the widest 10%.
• Gold time on the day in the chart is rebuilt from when each current top-100 time was set.

How the prediction works

It learns from every regular time trial since March 2023 ( events) how much the world record still falls after each day of an event. It adjusts for how many of the top-rated drivers have already set a time: if the fastest drivers haven't driven yet, expect more to come off. As daily snapshots build up, it also uses the top-100 spread.

Typical error in the final gold time, tested on past events: 0.16% after day 1, 0.12% after day 3 and 0.08% after day 7. On a 1:50 lap, that's about 0.18 s, 0.13 s and 0.09 s.

Other languages

This site is in English. Most browsers can translate it: in Chrome, tap ⋮ and then Translate.

Source

Data comes from the public leaderboards on gran-turismo.com. This is an unofficial fan project, not affiliated with Sony Interactive Entertainment or Polyphony Digital. Code and data: github.com/gt7-timetrials/gt7-timetrials.github.io.