Most cars have a propritary protocol, you just build a protocol converter to go from RS232 to the protocol.
OBDII is the industry standard, but it doesn't address all of the programable functions of most vehicles. Cars such as VW and AUDI's, you have to reset the airbags controls, and can read transmission telemetry, change the shift points, alter the alarms, and the list goes on.
But changing those things is not the same as perfomance tuning. Normally you have to burn an EPROM and place that in your ECU, or change to a stand alone unit that simulates the ECU to the car.
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Good thing I can run my C64 emulator on my PocketPC to connect to it!
This is really changing anyway, voluntarily by the automakers:
http://www.autosar.org/find02.php
Most cars have a propritary protocol, you just build a protocol converter to go from RS232 to the protocol.
OBDII is the industry standard, but it doesn't address all of the programable functions of most vehicles. Cars such as VW and AUDI's, you have to reset the airbags controls, and can read transmission telemetry, change the shift points, alter the alarms, and the list goes on.
But changing those things is not the same as perfomance tuning. Normally you have to burn an EPROM and place that in your ECU, or change to a stand alone unit that simulates the ECU to the car.
Check out opendiag.org, open source and it works.