Professional car performance meter that can use many data sources (Accelerometer, Internal GPS, External bluetooth GPS, OBD2 reader). This application requires some knowledge and initial setup, it is not a clik-and-go solution!
For best accuracy use External GPS or OBD2 reader (high refresh rate).

Features:
-Measure car performance for flat road runs (based on accelerometer, GPS and other)
-Acceleration (none) to .. in km/h (kph) mph , user defined speed ranges
-Travel time for 60ft, 330ft, 1/8 mile 1/4 quarter mile (mobile dragstrip)
-Very accurate for accelerometer : ~1-2% off car speed sensor
-No need to press buttons - just drive , measure and review the results when you want to
-Dyno with dynamic power graph and torque graph over RPM
-Store best results and compare it with others