I've done some experimenting trying to get an instant acceleration value from the change in VSS over a 1 second interval and the data comes out next to useless. The pulse interval varies too much. Might be just a mechanical issue with my cars VSS. Maybe measuring VSS change over something like a 10 second interval might work.
I was trying to compensate the instant MPG display to account for the kinetic energy stored in the car's motion. Its a really neat feature if the numbers weren't so jumpy.
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