Chris@SoS said:2. The ECU programs for the stock computer are developed with 91 octane pump gas. The Japanese (and possibly the European) ECUs are programmed from the factory for a higher octane used by these regions.
If I were to send you a UK ECU chip, do you have the ability to read it, and compare to a US one? If there are differences in maps, could you then be able to provide a Stage 1 map to suit Euro cars? I have a socketed ECU, and can therefore send the standard chip to you while running a spare chip.
Our octance numbers do look different to the US ones, we can get 98 octane rated petrol at the pumps, however the way this is measured is different here than in the US.