Demo.... Have a look at my website www.full-throttle.com.au and follow the links to the Boost Cooler products. Product info, pricing ans some FAQ's are there.

Coops - a good intercooler is going to be about 60% efficient (from what I have read) and that assumes that you use a good core to start with with properly designed end tanks etc. In most applications up to around 20psi, water injection can be used in place of intercoolers. There is also zero pressure drop with water injection.

Ideally, you could use both water injection and intercooling - that's what I am doing, and that is also what most of the top rally teams around the world do.

In most cases people mix the water with methanol or some other "fuel". This has a couple of benefits -

1. Methanol has quite a high octane rating (I read around 120?) so adding fuel to the fire is going to give you a bigger bang.

2. By adding Methanol etc you can actually start the injection process a little earlier. When using water only, you have to make sure your not putting the fire out. Generally, with water only, you start injection around 2psi higher than with a water/methanol mix.

When "playing" with water injection you need to keep a couple of things in mind.

a) Use a high pressure pump. The key is atomisation, so by using a higher pressure pump you get better atomisation. You can actually inject more water through a smaller nozzle giving better atomisation than a lower pressure pump using a larger nozzle. The more atomisation, the more water surface area is available for soaking the heat out of the air, and also it will evaporate faster - well before it hits the cylinder.

The boost cooler kits come with a 140PSI pump with an optional 220psi pump for big Horsepower applications.

b) use correctly designed and sized Nozzles - again for good atomisation.

c) Use parts which will not corrode with the use of methanol - Methanol is highly corrosive so make sure your system can handle it.

The ultimate idea is to cool the charge air as much as possible. This allows you to run more timing and/or more boost without detonation = more Power.

If your tutrbo car performs better on a cold night - then it will perform better with water injection. Factory cars get good gains too, as the factory ECU's retard timing as soon as they detect detonation. Water injection keeps detonation at bay - for longer.