Has anyone seen this:





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 info, communicating via an OBD-II 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
Boost**

Engine Code Retrieve and Reset

Want to know why your Check Engine light is on? Rev will tell you why!
Engine code checking
Listing of all engine codes thrown by the vehicle
One-button reset of your codes and Check Engine light"

Pretty damn cool app.

It uses the iphone gps for trackday functions including data logging laps with engine data , mapping etc.

Linky

App being used for video overlay (Leguna Seca):

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