Find out the max flow rating of your fuel injectors at the pressure being used in your system - multiply this by the IDCs you expect to see while water injection is being used. Then apply the target fuel to water ratio you are seeking to determine the flow needed from your jet. Again at the pressure of the water pump see the flow ratings. If using a variable pump pressure get the ratings for each pressure. If using something like the fia2 then it will be the same IDC as the reference fuel injector. If just using a high speed valve then the IDC is determined by your map configuration.
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