Force OBD2 has a dynamometer feature that allows the application to estimate the torque and power of the vehicle at the wheels.
A comparison between K04/RS6 hybrid and Tial 770R turbos on the same built 2.8l engine. Logs taken on days with similar ambient air pressure and air temperature and the same water/methanol injection on 91 octane at 5,280ft.
Over the course of tuning a K04/RS6 equipped Audi B5 S4 2.7T I have acquired hundreds of logs in a variety of different ambient air temperatures. Organizing the data demonstrates the effect of intake air temperature (IAT) on engine performance.
Far from a gimmick application, Force has been developed by a team of computer scientists and automotive experts to be a useful diagnostic and performance tool.
Gyroscope Explorer provides a working open source code example and Android application that demonstrates how to use the gyroscope sensor for measuring the rotation of an Android device.
Acceleration Explorer allows user to easily explore the devices acceleration sensor while visualizing and logging the effects of different filtering algorithms.
FSensor (FusionSensor) is an Android library that (hopefully) removes some/most of the complexity of using Androids orientation sensors (Acceleration, Magnetic and Gyroscope).
With an acceleration sensor alone, it is difficult to reliably sequester the gravity component (tilt) of the signal from the linear acceleration component (the real acceleration) without the addition of a gyroscope (rotation sensor).
A low-pass filter is a type of electronics filter that attempts to pass low-frequency signals through the filter unchanged while reducing the amplitude of signals with a frequency above what is known as the cutoff frequency. They are used for all sorts of things including audio, images, signal processing and digital filters.