The simplest arrangement is to simply pressurize a water container with boost pressure and pipe the water to the intake upstream of the compressor or in this case in front of the intercooler . This setup provides a proportional flow to boost. More boost more water. Some means of holding the flow off until a minimum boost is reached is required. Use a simple pressure switch and a solenoid valve to open at the required pressure. In any event, a typical cut in pressure is around 8 to 10 psi. A spring loaded valve would work also. Creating the mist in front of the cooler will be your job.

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Thanks DP,
I'm sure I can utilize the vast selection of sprayer nozzles and fittings for fertilizer, ect at the tractor store.

Why stop with the intercooler? I'm thinking that the a/c condensor and radiator could use the water spray April-november to beat the heat. Since I generally can't afford to make much 10 psi pressure at $2.20 for diesel avg. on my last roadtrip. 5 psi-8 was what I generally see on the highway unloaded going 70 mph. I make 10 gal of water a day in the hot months here off my a/c evaporator and I don't see myself having to fill the tank when the humidity is up much as I idle longer than drive sometimes with the a/c on.

For that setup to work, you would have to inject the water before the turbo, wouldn't you?

I am suggesting blowing water over the outside of the intercooler. You can do it up stream of the turbo if that is what you desire.

I always wondered if it would lower the electricity bill much if I would setup a similar thing on the houses central air fed by a garden hose. I would think it would but I was worried that it would cause dust to stick to the fins.

You might save a little bit, but you would offset it by your higher water bill. Without writing a novel on A/C systems, the freon running into your condensor will be about 27 deg F. Your best bet is to insulate the crap out of the low pressure line coming from your compressor all the way into your condensor unit in the house. FYI - The same thing can be done to your auto AC system for better efficiency.

The other problem with spraying water on aluminum coils constantly is that it will cause deterioration. I have seen many times a customer (I do HVAC work) that won't pay to replace old equipment will nurse it along, sometimes with sprinklers on the condenser coils. Makes me laugh everytime, but it does help a refrigeration system work better.

On the side I collect refer cores, I've seen how the aluminun corrodes/oxidizes where it sits in water at the bottom. It may accelerate the breakdown of the IC core/radiator but it won't keep it constantly wet, or soaked. It will wet it while your driving and evaporation should occur in minutes.

I agree. With an intercooler/water spray, I think that corrosion would be kept to a minimum. I think it is a great idea. I was thinking of an electric fan to make my intercooler more efficient, but this plan is probably better.