Water injection will cool the intake air, but water is non-condensable so it will increase compression ratio.If you want to see the difference between your engine running with cool air and hot (ie boosted) loose a water pump and wait to see how your engine runs at the higher compreesion created by the high temp.I lost the water pump in my 84 Mustang GT and the comprssion got so high that it would'nt even crank when the key was turned. High intake air temps will kill any motor unless it is designed for it.get an inter-cooler if your going to run boost.
