As far as I know all the tune resistor does is select which fuel map IE CAT or NON CAT, is operational. You can switch fuel maps according to the reistance of the tune resistor fitted. Have a look at this Fuel injection
Cheers Nick
Yeah what i figured, also I don't have lambdas I think this defaults too older stlye engine mapping, which gives richer mixture, and is not more biased around emissions......
will try first start, with Efi tomorrow - will let you know how I get on......