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you said "mines" do you mean the z4 ecu has a mines chip fitted? if so i wouldnt bother with the mines chip. its too agressive for even 99ron fuel. take the chip out, reconnect the j1 resistor and run with the z4 as it is if i were you.
ok my u8 is chipped, z4 is not, reason i am swapping is i am having a esl board fitted soon, cant be done on my u8 as chipped, and told z4 is buy far the better ecu for what mods i am having.
no, thats wrong mate. both them ecus are the same once chipped. the z4, once chiped. reads one the map thats placed on it. the u8 is an import ecu the same.
just take the chip/eprom out the u8, & put the esl live map board in
whos mapping it for you, ask them and they should say about the same mate