So, this probably isn't the most accurate thing in the world, but it is cool (and no, I'm in no way affiliated with these guys selling the app.)

It uses the accelerometer in your iPhone to emulate a g-meter. If it's consistent it might be useful for doing relative benchmarks, at least.

http://www.dynolicious.com/

 

It might be very accurate. I use a G-tech that also uses accelerometers to measure your 0-60 etc. The main point of concern is that you need to keep it as still as possible when using it. Any movement will result in erroneous readings.

 

Wiimotes work great for this, stream to laptop or PDA or phone over bluetooth.

 

My review: It's a POS.

I have a first-gen iphone, no jailbreaks, no hacks, box stock 7.0.1 software. Bought the app and loaded it. There's a six step calibration where you hold the phone in six different orientations. Mine would not get through the 1st step. Rebooted, used different methods of holding it, it wouldn't work. Later, the app wouldn't even run. Backed up the app & reloaded it, but now it won't get through the 5th step.

Looking at the reviews, this is quite common. So save your money and wait until the next update of the software comes out.

 

Just for balance: No issues whatsoever with mine.

Works like a champ, best $13 toy I have ever bought. Only wish there was a way to share results.

-Ken Rudd

 

I purchased this app, and have the same trouble with the calibration in the sense that it won't finish with calibration. It'll ding when I move the orientation to upright, horizontal, etc., so it might be registering the positions anyway.

It would seem to be, because it does record the data, although I've only made two runs in the car.

As Rudd mentions, there's no way to export the data, so it's rather limited, and it seems to take a long time to setup before each run, so it is far from perfect/dreamy.

It is fun anyway, though, and I've certainly blown $13 on much less satisfying experiences!

 

My first thoughht was this must be just another useless fraud.
Looking at the website, I find it interesting.
Missing some features, it seems, like data export, but if it is a success the creator will fix that.

The problem is that the accuracy is not documented.
And the accuracy is really limited by the accelerometer in the iPhone, as therefore out of control by the designer of this application.
Still, if the acc is good, accuracy depends also on signal processing algorithms used, especially how the signal is filtered.

But at USD 13 it can hardly be called a fraud.
I actually find this kind of business development interesting, and it may also be useful, or at least a funny tool, for many car enthusiasts.

 

Check this out if you are reading this thread. It was tested against a real dyno!

http://gizmodo.com/5034542/13-iphone...ated-dynometer