injector d/c is alot better, as it will follow load and rpm. for example you could have 10psi manifold presure at 4000rpm, and the same 10psi manifold pressure at 8000rpm. in a perfect world you'l need twice as much water at 8000rpm as 4000rpm. since the motor is spining twice as fast. injector d/c will usually closely follow how much air the engine is flowing.
so end of the day its better to have it follow flow, not presure
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