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Reference.org
Three-stage VTEC
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<p>Three-stage VTEC is a multi-stage implementation of Honda's <a href="/facts/VTEC/A0RgqBq1">VTEC</a> and VTEC-E (colloquially known as dual VTEC) technology, implemented in some of the company's <a href="/facts/Honda_D_engine/CSDawd4H">D series engines</a> from 1995 to the present day, allowing the engine to achieve both <a href="/facts/Fuel_efficiency/URhdQ7Wl">fuel efficiency</a> and power. VTEC-E (for "Efficiency") is a form of VTEC that closes off one intake valve at low RPMs to give good economy at low power levels, while "VTEC" is a mode that allows for greater power at high RPMs, while giving relatively efficient performance at "normal" operating speeds. "Three-stage VTEC" gives both types in one engine, at the cost of greater complexity and expense. </p>