sorry for sounding stupid. I've heard of vtec since it came out, and I know vtec stands for valve timing electronic control. but I want to know exactly what goes on when vtec is activated. does it really change the valve timing? how do you do that with the engine running? is it just valve timing? or what other changes occur? I'm not hating on vtec, i am interested in what it does, however, i've ridden in 2 or 3 vtec hondas, some with some mods done to them, and I feel no power gain at all when they go into vtec. they got louder, but didn't seem to pull any harder.