Originally Posted by waldig
I have used water injection and it lowers the combustion temperature and lowers the tendancy to detonate, preventing timing from being pulled by the computer. It does not make power, just lets you push the motor longer and with limited octane. The meth can help but are going to use a bunch in the course of engine operation on the street unless you have a throttle switch.
Water does assist in removing deposits from the engine interior parts, sort of like adding walnut husks in the huey's turbine engines of vietnam.
Woody
Well said Waldig. Water/meth injection does not really make power on its own, but it does allow tuning to get the most out of your engine before detonation. Most of the kits nowadays can either be run off of maf voltage or the one I'm looking at is boost activated. You can set a minimum value and ramp up to full injection at any given boost pressure. As long as you stay under the minimum boost setting on the controller, you won't be injecting and therefore you won't be constantly having to add more water/meth.