Free Engine Testing App MicroDyno from Google Play – was USD 6
SIP HorsePower Dyno (MicroDyno) for Android -unlike all other Dyno Apps out there- doesn’t use the acceleration or GPS sensor, because both aren’t exact enough to achieve a good measuring result.
SIP HorsePower Dyno (MicroDyno) can measure the rpm of the engine by analyzing the exact frequency, recorded with the microphone (Screenshot 1: in the middle you can clearly see accelerating in 1st, 2nd and 3rd gear).
The faster the rpm increases, the better the performance of the engine. The gear ratio of our rides remains the same as long as there is no shift of gears. This way, the speed can be calculated from the rpm just as you can then calculate the performance by the change of speed which equals acceleration.
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To obtain the most realistic performance value possible, you need to enter a couple of values as precisely as possible:
- overall weight
- tire circumference
- air pressure
- gear ratio
- Cw-Value (Tough one, but if you don’t change this for different runs, you get repeatable and combarable results, this value moves the resulting curve on the y-axis, so it can be used to calibrate the dyno. If this value is way off the result can be off about 2 PS)
Important: All the apps mentioned here are free at the time of publishing this article. It may, you see some price tag instead of “Free” when visiting the App Store which means the app is no longer available as “Free”. Not being free and you buy or download it, you may be charged with the price of the app. Please, also be aware that some apps may have in-app-purchases options.