Ring gumming. Been reading various water injection threads with interest. One day I may set it all up properly with valves and pumps etc, but in the meantime, I was thinking pumped garden fence sprayer straight into plenum twice a year before the car's oil change and dino thrash. My question, is what is the best number of revs and quantity of water to go for? Can one use too much water? By that I don't mean for pouring it all in at once! I've read once or twice that the engine should be under load when carrying out water injection - why is this? Is it necessary? Cheers, Matt.