http://www.devtoaster.com/products/rev/index.html

Rev Features
Built-in Metrics

The iPhone is a powerful computing platform, and Rev takes advantage of all the iPhone's built-in technology to provide interesting metrics about your vehicle. These built-in metrics, available without the aid of additional hardware, include:

* Lateral and Forward Acceleration: Graph your cornering, braking and acceleration G-forces. (Also available in Rev Lite)
* GPS Track: Visual track displays your location and acceleration data - see how you are braking and accelerating around corners. (Also available in Rev Lite)

OBD Metrics

Rev gives you access to lots of vehicle metrics, communicating via the ElmCanII-WLAN device to extract highly accurate, real-time data directly from your vehicle's ECU. Those metrics include:

* Vehicle Speed
* RPM
* Fuel Consumption
* Engine Coolant Temp
* Fuel Pressure
* Calculated Engine Load
* Throttle Position
* Intake Manifold Pressure
* Air Intake Temp
* Timing Advance
* Mass Air Flow
* Fuel Level
* Barometric Pressure
* EVAP System Vapor Pressure
* Fuel Trim


Also includes ability to recall engine codes and data logging for trackdays.

 

wow this application looks amazing especially for 49 dollars. I might pick it up