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Originally Posted by THE ICE MAN
...I still need to know at what A/F ratio I should use with & without water?
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It depends on the Comp Ratio, among others.
If the CR has been lowered enough (relative to boost levels) then you can run a bit leaner than otherwise.
With W.I. you can run a bit leaner still.
As a rule, with crap intercooling and inadequate CR lowering, AFR of 11:1 is a good idea
With good intercooling, low CR you can aim for 12:1
With W.I. on top, you're looking at 12.5-13.0:1 perhaps.
Of course cam timing, fuel quality and ignition timing will also affect things.