i've struggled to read your post to be honest david, what with the random presses of the return key to jump to a new line when you haven't even finished your sentence

you've not told us anything new there really. you said before that you think that the lambda control for larger injectors may need more map sites - i'm saying it has nothing to do with the map as it just runs a completely different strategy when in closed loop. it doesn't run off the values in the map as it doesn't need to.

it needs to start somewhere with a base injector duration from the map, but then it just uses the feedback from the lambda sensor to know whether it's rich or lean. if rich, use less fuel. if lean, use more. the calculation of how much to use is standard closed loop control circuit feedback stuff known as PID. for different sized injectors, you just need to optimise the PID settings so that the control behaves as you want based on the feedback from the lambda sensor.

hope that helps