i have a 95 honda del sol with d15b7, it has zc pistons,my friend is telling me its a v-tec engine, he has a 2000 honda civic si, i let him drive my del sol today and he got on it and he noticed all my power kick on at the same rpm point as v-tec and when we got to his house we looked for the v-tec seloind but didnt find it, can guys help me out and tell me what can cause this?