All you need is your camera!
Just a GoPro Hero 9, 10, 11 or 13, or a DJI with its GPS remote. No special hardware. Nothing on the steering wheel.
You achieved a best lap of 36.32s on Lap 11, showing that you can find pace as the session progresses. However, a 3.82s consistency range is unacceptable for championship-level racing, where the target is ±0.5s. You have the raw speed, but you must now master the ability to repeat it. Your best lap data shows a peak cornering force of 1.37g, which indicates you are finding good grip in the corners. Your smoothness score of 0.707 is decent, but the high variance in your lap times suggests inconsistent braking points and throttle application. You are currently leaving too much time on the table by over-driving some corners and under-driving others. Your lap times improved by 0.96s from your early pace to your late-session peak, confirming that the tires reached their optimal temperature window only toward the end of the session. To get the tires into their operating window sooner, increase your tire pressure by 0.5 PSI before your next run. You showed excellent ability to extract top speed on the straights, hitting 47.4 MPH on Lap 11. Your ability to maintain a high cornering G-force of 1.36g through the long left-hander at Turn 5 proves you have the confidence to carry speed through technical sections. Your entry into Turn 4 is costing you time; with a minimum speed of only 25.4 mph, you are likely overslowing the kart before the apex. Additionally, observe your line through Turn 1 between 0.0s and 8.4s; you are scrubbing too much speed with heavy braking inputs that exceed the necessary 0.54g requirement. Increase tire pressure by 0.5 PSI to ensure quicker warm-up and more consistent grip from the opening laps. Brake 2 meters later into Turn 4 to carry more entry speed; focus on a lighter, more progressive touch on the pedal. Target a 5-lap window where every lap is within ±0.5s of your personal best to prove you can hold a championship pace. Focus on early throttle in Turn 5; try to get back to full power slightly sooner to maximize your speed onto the straight leading to Turn 6.
Works with Hero 9–13 and DJI Action + GPS remote · Which cameras work
Racing Line
Sudbury Kart ClubGPS Lap Timer
400HzSpeed
Performance Trace
Five channels. One upload.
Your action camera is already recording GPS position, accelerometer data, speed, and gyroscope orientation on every lap. Race Ninja reads it directly from the video file and gives you lap times, sector splits, racing lines on satellite imagery, and braking zone markers. Nothing to install, nothing to configure.
Your Perfect Lap
Every driver has sessions where sector 1 was nailed on lap 3, sector 2 peaked on lap 7, and sector 3 came together on lap 5. Your fastest sectors already exist. Just not in the same lap.
Your Perfect Lap stitches those sectors into a single composite video showing you the lap you're already capable of, with a theoretical time built from your real best-of-session data.
Theoretical best from session
See exactly where you gained or lost
Head-to-Head
Compare two laps side by side with synchronised video and racing lines on satellite.
Sector Analysis
Colour-coded sectors, speed zones, and equipment metrics for every lap.
AI Coaching
Session summary with strengths, weaknesses, and specific setup suggestions.
Show the world what you've got
Build videos with telemetry overlays. Download an MP4 ready for Instagram, TikTok, wherever. Share when you want to. Keep private when you don't.
Compare speed, lateral g-force, longitudinal g-force, and performance traces between any two laps.
See exactly where the time goes
Race Ninja breaks every session down sector by sector. See which parts of the track you nail and which ones wobble, where your typical lap leaks time against your best, and how each sector trends as the session goes on. Every chart points you at what to work on next time out.
Fuse your dashboard data
Running an Alfano, AiM, or other kart dashboard? Upload your session file alongside your video and Race Ninja time-syncs them automatically. RPM, EGT, and hardware speed appear on your video overlay, matched lap by lap.
Any track. Any kart. Any car. Anywhere in the world.
Drive somewhere new, upload the footage, and Race Ninja figures out where you were. It detects the circuit, splits your laps, and builds the telemetry. No manual setup.
Works with:
Simple, honest pricing
Choose what fits how you race. No hidden fees.
Subscribe
Best for regular racers. AI coaching, 1080p video, permanent hosting.
From £9.99/mo
Pay As You Go
No commitment. 1080p video, weather, sector detection. 365-day hosting.
£1.59 per analysis
From the blog
Tips, tutorials & updates
The engine wasn't giving him the kick
Roman was driving well. The engine wasn't. We borrowed one and broke into the 39s. Engine insights now sit on the same lap as the camera so you can see a drop-off instead of guessing.
2 min read
Pick a HUD look. Then burn it onto the lap
The Video Editor now has extra looks for the HUD you burn onto a lap. Donut gauges, LED ladders and speed overlays, with font, colour, background and size you set yourself from the GPS your camera already logged.
3 min read
Your whole DJI session now counts, every chapter
DJI splits long recordings into chapters, and until now only the first one kept its telemetry. Now the whole session uploads, chapters linked automatically and every lap timed.
3 min read
Your data stays yours
Every lap you upload is private the moment it lands. It isn't shared with a team. It isn't pooled into anyone else's comparison. It isn't shown to another driver. And it never will be unless you say so.
You decide what happens next. Want your coach or your squad to see a session? Share it. Want to keep a scrappy practice day to yourself? Keep it locked. The choice sits with you on every single lap, and you can change your mind whenever you like.
Your driving is your edge. We're not in the business of handing it to the people you line up against. So nothing leaves your garage on its own. Not your telemetry, not your racing line, not your times.
Private by default
No setting to hunt for. You upload, you analyse, and the data is visible to you and nobody else.
Shared only when you choose
One toggle shows a lap to your team or a rival, or puts it on a public leaderboard. Flip it back whenever you want.