Yes there are different ECU manufacturers (Siemens is one manufacturer I forget the others, Fujitsu maybe) and the Estate cars all have a different one for some reason. Makes sense as its a 4Drive, but not sure why the Golf R and Golf R estate have different ones.@Damo H Someone on this forum (and I think it was you) mentioned somewhere there is a difference between the ECU's of I think 4Drive (ST) and FWD Cupra's. I can't find that post anymore, but I would realy like to know what the difference is. Is it pure in hardware, or in the program on it, or in the used data? Will it make a difference in the way a stage 1 remap should be programmed, or in the result that can be achieved?
Sorry but not only are the make of ECU's different, but how they store the information is different. Not sure why VAG use different manufacturers, probably cost. You'd also expect the way they work to be the same even, if made by different companies, but how they store the info is different.No difference in ECU
The ECU's are also different based on market as well. So for example I recently had chance to see that the Australian S3 ECU software being worked on by Racingline, as it is different to the European ones.