This tutorial shows how to do a Dyno test using PerfExpert Onboard Dyno app.
PerfExpert allows you to measure horsepower and torque very accurately through the entire engine rev range with your smartphone, without any connection to the car (uses accelerometer). With PerfExpert you can compare your engine performance before and after tuning.
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Here are some PerfExpert vs Chassis Dyno comparisons : [ Ссылка ]

Check out PerfExpert users tests that they shared with the community :
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The car is a 1989 Toyota Corolla GTI 16v AE92 (Euro) with 4AGZE engine swap from AE101 (Japan).

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