Poor Man's Dyno

[Bootie]

I just came upon an Apple App for iPhones. It uses the accelerometers built into the iPhones to obtain Miles/Hr, Dist, Horse Power, and Forward and Lateral acceleration. It is called gMeter and it costs $8.99 but it's pretty good. Check out their website at www.hunter.pairsite.com/gmeter/
The raw data can be emailed and then incorporated in, for example, an Excel Spreadsheet.
You have to be careful about the setup and calibration but once these things are completed. It has several modes of operation (Manual,1/4mile, 0-60, 60-0)but I mostly used the 0-60 feature. The calculations are based on the acceleration so the data are kind of noisy. Also, the HP is based on vehicle velocity and weight. I think this accounts for an error in the max HP (shown below to be over 150HP).
Anyway, for $8.99 it would be worth it just to play.

The dip in the HP and Forward_g graphs is where I shifted from 1st to 2nd Gear