Re: the rally computer
I'm currently working on something very similar. It will interface to the car using the OBD-II socket, which most modern vehicles should have.
I have the interface and myself and a colleague have tested it with a laptop in the car and we can pull most of the engine stats back.
I am developing some software for the empeg to do the displays, I have got as far as writing some functions to write text, draw bar graphs etc.
It should be possible to do some of the following:
* Speed / RPM senisitve volume control
* Engine temps, boost pressure, load...
* Play chillout music if your average speed/RPM is too high!
* 0-60 times
* Calculate best time to change gear based on historical data and beep
And silly ideas like convert your engine sound into a TVR (if your sub is big enough!)
Phil.