REALLY????
Another Toyota VVTi to Honda Vtec Comparison...lol
Vtec completely different,
VVTi = Varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt or chain) and intake camshaft. BUT DOES NOT LIFT VALVES!
Vtec = It is a valve train system to improve the volumetric efficiency of a four cylinder internal combustion engine.
It not only varies the timing, but also LIFTS VALVES
When Vtec is Engaged the computer sends small current to the vtec solenoid which controls the oil driven adjustable cam gear.
The higher the Oil pressure, higher/faster the valves are lifted which = A more Aggressive the Switch over and soo on.