Pocket dyno is a great application on the iphone which uses the iphones accelerometer to calculate various parameters calculated by dynos. Some things need to be closely controlled to get best results and I have found the application really accurate.
After calibration of the application you have to make sure the phone remains perfectly still during the run. When you start your run the application automatically detects it and gives your current speed during the run which I found to be very accurate and hence believe in the integrity of the results. Here are three examples
1)Vitz 2000 automatic 15 inch alloys and 195 tires 0-100 in 17 secs
2) City 2003 all stock. 175 tires
3) Civic 2009 1.8 MT i vtec. 15 inch rims 195 tires . all stock 0-100 in almost 8 secs. quarter mile is not accurate as i wasent fully accelarating after 100 due to some trafic.
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