Two auto performance meters for iPhone

Hey, I’m from MyRide.com, and we’re now using Dynolicious as part of our car reviews (the first ones to do it!). Check out how the new Smart Car stacked up performance wise at http://www.myride.com/lifestyle/iphone_road_test_2008_smart_passion_cabriolet-4138-page1.html&id=31000

It's actually more accurate than the G-tech.

http://www.garage419.com/episode/419_20080807

It was only off by 4.6 HP versus a mustang dynamometer. I'm just curious if those of you who claim that it is off by 25 hp have actually run your car on a legitimate dynamometer recently before trying the app.

While the program may be cheap, comparing it to the G-tech in terms of cost seems pretty ridiculous. The iphone 3G unsubsidized is speculated to be in the $600-$700 for the hardware alone.

I have a hard time thinking this even comes close to as accurate as the g-tech.

Anybody have Dynolicious and can say whether metric values can be set up i.e. km/h? I'm still waiting for a response from them on this question - there is no screenshot/documentation in iTunes/their web site of what can be changed in the set up screen.

I hope everyone realizes that these Apps are toys -- there's little hope of accurate track mapping, timing and accurate power estimation (which, relies on you knowing exactly how much your car -- with you and a variable load of gasoline in it -- weighs).

Even the G-Tech's are woefully inaccurate for anything other than "entertainment."

If you want a real, accelerometer/GPS-based performance data logger, they start at around $1000.

HI, i´m rx8 owner.. and i use in tracks my car...

i want an app that measure the time that you spend to ride from one point to other point, get it by GPS position.

this is good for a track day, to know how do spend to run one lap.

there is some forum of iphone app developers to make the suggest for someone do that app?

Does it come with cheap gas?

I tried it. It's not that accurate, but it appears consistent. It's off by about 25HP on my car, and at least 0.5 to 0.75 seconds on 0-60. Didn't try the 1/4 mile.

Still, a great app.

RPMs can be derived from the vibration frequency, picked up by the microphone and accelerometer.

HP can be derived from the mass of the car times the measured acceleration, plus the coefficient of drag times speed.

Speed can be derived by integrating the acceleration over time.

I would like to see something like this on the Installer :)