I downloaded an app called dynolicious that runs onan iPhone or iPod Touch.

This little app will give you your 0-60, 1/4 mile times plus engine HP and a bunch of other stuff. It does not use teh car's speeedo (which are often wrong). the iPod/phone has an accelerometer built in.

http://www.nextautos.com/iphone-app-puts-a-dyno-in-your-pocket

I just tested my '85 300D turbo. Up to temperature but only just. Flattish rd, not much wind.

0-60mph 15.7sec
1/4 mile 20.7 (68mph)
max bhp 89 (assuming 20% transmission loss)
I have tried this before with stopwatch and speedo reading, but this is a much better way!

PS: Did same run with our '72 SL and it just beats the published data. (9sec 0-60 and 17.2 1/4 mile)

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5