Thanks Scott for the heads up on the scan tools. But like HDDP says my main reason for looking at all this was to enable the modification of the fuelling/ignition maps following any engine mod that may require it. My initial investigations with the Elm chips, which I now have working but are read only, was to establish the protocols that the car uses. The first step will be to log OBD data whilst on the road/track such as AF, ignition advance and other useful data such as actual trottle butterfly position relative to throttle pedal position. This will give a better understanding of what the car is actually doing as opposed to what we think it is doing.

Having established what protocol is being used the aim would then be to write some software to write stuff back to the various ECU's - this is fraught with potential problems I know, but nothing ventured...

Without going over old ground concerning the gains of 'chipping' a stock N/A engine, I don't see much potential for altering maps for the stock car. But for any mods that increase airflow beyond the point that the stock ECU is able to compensate for, you are going to need to look at remapping.

I know there are commercial systems available for this, your company has undoubtedly invested in such a system, but it cost about the same as my Crossfire is worth!

Cheers,
Simon.