1. Duration valve timing S-VT
S-VT (duration valve timing) and Honda VTEC very different, Mazda uses a static cam, and is mounted to the shaft a gear fitted on the teeth, the cog can speed up or slowing the rotational speed of the shaft. Some valves may open sooner or later, but never appears valve open too long, opening too fast, or too high degree of open phenomenon. A precision cog by the oil pump control, called fuel control valve OCV. The car’s computer will speed up or slow down the rate of intake air to what extent the basis for a series of input parameter tells OCV, these parameters include pedal pressure, engine temperature and so on.