Powertora

Powertora turns your car and a 25 Hz GPS sensor into a dyno. One full-throttle
pull and a coast-down on a flat road give you a real power and torque curve —
measured, not estimated.

HOW IT WORKS
Drive a single pull in one gear from low rpm to the limiter, then coast back
down on the same stretch of road. The pull measures how fast your car
accelerates; the coast measures your actual aero, rolling and drivetrain
losses. Because losses are measured — not taken from a generic drivetrain
percentage — the curve you get is crank-equivalent power in metric PS.
Results are corrected for air density (DIN) using the real weather at your
location and time.

HONEST ACCURACY
Accuracy is benchmarked on every change, not asserted once:
• On synthetic engines with a GPS-noise model calibrated from real hardware,
the pipeline recovers peak power within about ±1.3 PS.
• In real road sessions, run-to-run repeatability holds to ~1.3% on a
naturally aspirated test car and ~2.8% on a turbo car.
• Every result carries a quality score and a confidence band, so you always
know how much to trust the number.
How we validate: https://powertora.app/validation

WHAT YOU NEED
An external Bluetooth GPS performance meter (RaceBox or Dragy). Phone GPS is
not accurate enough for a power curve — 25 Hz Doppler speed from a dedicated
sensor is what makes the math work.

FREE FOREVER
• Unlimited measurements and full power/torque curves
• Quality score and "where the power goes" loss breakdown
• Shareable PNG result card and web report link
• Run history on your device

POWERTORA PRO
• Merge 3+ runs into one high-confidence curve with automatic outlier
rejection — the most accurate number the app can produce
• Printable PDF dyno reports
• Before/after comparison exports (tune, intake, exhaust — prove the gain)
• Multi-GPS fusion: record one run with several sensors for extra precision
• Unlimited car garage and road maps (curvature, grade and wind of your run)
Pro is a subscription or a one-time lifetime unlock.

NO ACCOUNTS, NO ADS
No sign-up, no tracking, no ads. Runs are anonymous; your history stays on
your phone. Share a result only when you choose to.

Measure responsibly: use a closed road or track, respect local laws, and
never measure in traffic.