Nissan Variable Timing control[1] or Nissan Valve Timing Control System (commonly known as N-VTC, VTC, NVCS or NVTCS) is an automobile variable valve timing technology developed by Nissan.
This rotation is achieved when an electric solenoid, controlled by the car's ECU, allows pressurized engine oil to flow into and through the cam and into a slave mechanism, axially advancing camshaft timing relative to the sprocket.
Valve to crank angle timing varies depending on whether engine speed is high or low and changes at fixed intervals.
NVTCS is hydraulically actuated similar to Honda's VTEC system, but adjusts a different aspect of the valve train, so it is more like the I part of I-VTEC.
NVTCS was eventually phased out and replaced by a continuously variable system called CVTCS on newer engines such as the VQ and VK series.