How's it gonna get horsepower rating without being connected somehow to the car?
You might be able to get some very rough time data based on the GPS functionality. However I doubt their .08 second accuracy, since the GPS on the iPhone got slammed in all the reviews I read, for it's relative inaccuracy.
For the record, I just ordered three of the dumb things for my family. Me, I'm getting an AT&T tilt. I've got a good MP3 player (80g Zune), I need a good PDA/phone combo. I had an iPhone on order, and cancelled it after I read more about it. Probably a good device for the teenager, or casual user, and I LOVE the UI, but I need more from my phone if I'm going to be able to stop carrying a PDA and a cell.
Looks like fun regardless, same concept as the Gtech meters - given an accurate entered vehicle weight, accurate accelerometer and a flat road it ought to be extremely close.
Not a bad price for some cheap fun if you've already got the iPhone. If someone gets to post up some results before I have a chance to mess with it let me know... looks like fun!
saw this earlier in the vw forums -- looks like a cool app if you've already got the iphone. too bad i've gotta wait -- can't upgrade to 2.0... i'm jailbroken and unlocked