The iPhone 3G, with its accelerometers and GPS chip, has spawned a unique category of programs in the App Store: automobile performance measurement tools. These programs use the iPhone’s GPS chip to measure your vehicle’s acceleration and speed (and via this data, horsepower), and the accelerometers to measure the g-forces applied while turning and braking or accelerating.
From macworld.com
The iPhone seems to be all the hype among automotive enthusiasts these days, and recently a broad flora of automotive-related applications have emerged for the device. Macworld have tested 10 different applications for automotive use, so if you have been waiting to do some g-force checking in your vehicle you definitely should check it out.
