Spinning like a cat
Join Date: Sep 2011
As far as I know a ph1 GTV can't be remapped using software through the diagnosti port (2.10.3 and 2.10.4 ECUs). You need to take the ECU apart, take out the memory chip, read out the original memory dump, modify the dump with a suitable software tool, program a new chip and put the new chip in the ECU. In order to program a chip you need an EPROM-programmer.
To change the mapping in a seroius way need a lot of knowledge and experience, and preferably a dyno to see what you achieve. To monitor what you are doing you need to keep track of lambda value with a wide band lambda sensor, exhaust gas temperature and knocking, etc. etc.
I'm not saying it can't be done, it certainly can, but it is a long way getting there if you are starting from scratch with no experience.