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Originally Posted by Flybert
Dousan is correct. The rear cylinder will always be the leanest because off all the air being pushed to the back of the intake manifold. The second cylinder on SR's for some reason has a tendency to kill pistons and rings.
That is why I would put the richest ones on those cylinders.
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dousan is correct,
in addition to flyberts comment on poor manifold design that increases air capacity to #4 while starving #1 of air(basic concept that should be incorporated into IC endtank design edit: actually a lack of in respect to our manifold, lol),
normally its becasue of the flow of fuel. the injectors closest to the fuel regulator/return line has most flow potential, whereas injector farthest from return line is spikey at max-limit flow and that injector closest to the fuel inlet line has the least amount of flow potential.
if u are using a stand alone computer and can trim each injector seperately, i agree, yes #4 should get the highest flow injector.