Support

The Drive screen needs a GPS lock. Step outside (or onto a clear-sky balcony), wait a few seconds, and you should see the speed update. Inside a building or under heavy cover, GPS will not work. iPhones use GPS, GLONASS, Galileo, and BeiDou — but they all need sky visibility.

Dyno-mode RPM tracking needs your vehicle's engine type and cylinder count filled in on the Vehicle profile. Electric vehicles don't have an acoustic engine signature, so the app correctly disables mic-RPM for them. For combustion engines, do one or two dyno pulls so the app auto-calibrates the harmonic order — once it does, the RPM number appears live next to the speed.

HP accuracy depends almost entirely on three inputs on your Vehicle profile: total weight (curb + driver + cargo), drag coefficient, and frontal area. A 5% error in weight is a 5% error in HP. A 10% error in drag × area is a 10% error in HP at speed. Double-check those values from your manufacturer's spec sheet or measure them, then run "Recalculate saved runs" in Settings to re-derive HP for all your saved pulls.

If the numbers are still wrong, sanity-check the gear ratio you've set for the dyno gear, the final-drive ratio, and the tire rolling radius. A wrong gear ratio gives a wrong RPM, which gives a wrong engine torque.

iCloud sync is on by default. Both devices need to be signed into the same Apple ID with iCloud Drive enabled. First sync after enabling can take a few minutes depending on how many runs you have. If the second device doesn't show your runs after ten minutes, check Settings → [Your Name] → iCloud → TrackDyno on both devices and confirm sync is enabled there.

Not in v1.0. The Share button on a saved run currently exports a shareable image card. Raw CSV / GPX export is on the roadmap for a future release.

Vehicle tab → tap your vehicle → scroll to the Engine section → tap "Reset calibration" beneath the harmonic-order readout. The next dyno pull will start fresh.

No. The microphone is only used during a dyno pull, and only to compute the dominant engine harmonic frequency in real time through an on-device FFT. The underlying audio samples are processed in an ~85 millisecond sliding window and immediately overwritten — they are never recorded, stored, or transmitted.

Delete the TrackDyno app from your iPhone. If iCloud sync is on, also delete the TrackDyno data from your iCloud Drive: Settings → [Your Name] → iCloud → Manage Account Storage → TrackDyno → Delete Data.

No. TrackDyno is designed for closed courses, drag strips, autocross sites, and sanctioned track-day events. Using it to perform timed runs on public roads is a violation of the Terms of Use and probably also illegal wherever you are.