Injecting water means into the air stream into the combustion chamber. This is usually done with an extra injector placed about 6" before the throttle body. Much more effective than spraying the intercooler.
On my car, with an injection system, you can drive it like you stole it, then open the hood and find the intake manifold is ice cold.
ayat, sorry, those links were not meant to be a primer on water injection, just as an example of the relative complexity of the Mopar system to a bar with holes, as most aftermarket sprayers are. My apologies.
Basically (and correct if I go astray here, OZ, I find I best learn something by teaching it) since the #1 cause of detonation is heat in the cylinder, which DCX combats with all that extra fuel), what you are doing with the water injection is taking heat from the intake charge. Water in the engine screams to us "YOU MUST BE NUTS!!!" , but properly vaporized, the water droplets take the heat from the air, just like an intercooler. They are too small to be a danger to the engine.
The keys are a high pressure pump, because you MUST vaporise the water, properly designed nozzles, for the same reason, and as with all things, knowledge and control.
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I used to own one of the first SRT-4s sold, bought it new in Feb 2003, sold it Nov 2006 with 75K and Stage 3. Now I drive a 2006 SRT-8 Charger.
Found this explaination:
The way it basically works is you have a reservoir that holds water. Connected to it is a water pump. A pressure switch sees a certain psi of boost and sends power to the water solenoid and pump. The pump then sucks water from the reservoir and injects it into the airstream via a spray nozzle attached in the TB elbow. It sprays a fine mist (far to fine to lock an engine) that gets sucked into the cylinder. In there, the heat turns the liquid into a gas (steam), in the process absorbing a lot of heat. The net result is
1) Cooler intake charges (similar to what a bigger intercooler does)
2) Steam cleaning your head and valves
3) Reduction in knock.
Since it reduces knock, your engine will advance timing making more power (similar to running higher octane gas).
ahhhhhhhhh. and that's where aquamist warns against larger intercoolers without taking the density charge into consideration.
i never saw a hint of anything near this intriguing in any official SRT release, but i'm curious to see how the IC sprayer works.....WHEN I GET IT IN THE MAIL!!!
the pictures on the mopar catalog meant nothing to me.
I'm not sure, but it seems some think that an IC sprayer is the same thing as water injection? they are 2 very different things... maybe I'm just catching 2 different conversations...
For info on water injection, try google. There's tons of info out there on it - it's been around since world war 2.
I built my first WI set-up in the late 80's - i am definately a fan
High pressure for sure. Here's the plan, we dress you in nice, non-scratchy clothes. then we strap you to the hood, then, at maybe 80, you peek over the edge of the hood. Of course we will have to get you goggles for safety, don't want any superfine water drops to hit you Good?
concept is the same, Jason, just the application is different. For safety/liability, I imagine. " So, are we okay wiht selling the consuner a kit to spray water INTO his engine?" Can you imagine management FREAKING OUT!!!!!!!!?
The risk for Mopar to go there are not worth the potential ugliness when folks screw it up.
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Who Understands "Water Injection"?
) since the #1 cause of detonation is heat in the cylinder, which DCX combats with all that extra fuel), what you are doing with the water injection is taking heat from the intake charge. Water in the engine screams to us "YOU MUST BE NUTS!!!" , but properly vaporized, the water droplets take the heat from the air, just like an intercooler. They are too small to be a danger to the engine. 
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