GT-ER

Today I ran my car with and without the water injection system and I was shocked to find that my IAT's would go down only 15-20* in it's peak....and even worse, my knock retard would go UP from an average of 2-3* to 5-6*...heck....I even saw spikes of 7* with the water injection ON....WTF? I'm afraid of blowing my engine now by using something that's supposed to help it.