Originally Posted by mudmojo
I saw a video of an iPhone3 with Dynolicious installed they talk about immobilizing and orienting the device for the most accurate readouts.
Yes, that must be done. And on the acelerometers we use on the product I am working on, I have to read the output of the accelerometers when the car is stationary, to calibrate them. The output will vary with the orientation of the accelerometer. The technique is called auto-zero calibration.