Definition:
Variable Valve Timing with Intelligence (VVT-i)
VVT-i is a system that allows a hydraulically controlled cam sprocket to change position, which in turn alters an engine's valve timing. The engine's computer reads input from all of a vehicle's sensors in order to determine the valve timing that's required to meet current demands. The change can occur rapidly, which means it delivers optimum performance upon acceleration, but after cruising speed is reached it can change again to provide the best fuel economy.Dual VVT-i is used on vehicles equipped with separate intake and exhaust camshafts; setting for each can be altered independently by the computer.
Primary benefits of the system include:
- Easier starting
- Quicker, smoother acceleration
- Better fuel economy
- Lower emissions
