Actually, V-Tec stands for Variable valve timing and electronic lift duration control. Basically in a nut shell, Your cam shaft opens and closes the valves that let gas into the engine and exhaust fumes out of the combustion chamber. The V-tec has something called a dual stage cam shaft. Basically giving your engine more power at low RPMs and more power at High RPMS.Other engines have a single phase cam that only has one demension. The V-Tec lets the valves stay open longer at higher RPMs letting the engine breath better and rev higher, while letting you have the power you need for street driving. In a 6 cylinder, it usually kicks over at 3500 to 3800 rpms. In a 4 its a little higher. Its racing technology brought to the local dealer.