well as a greater total range of adjustment. The combination of these factors allows more precise control, resulting in an improvement of both fuel economy, engine output and emissions performance. VVT-iW VVT-iW (Variable Valve Timing - intelligent Wide) was introduced with the 2.0L turbocharged direct-injected 8AR-FTS fitted to the Lexus NX 200t. VVT-iW uses VVT-iW on the intake valves and VVT-i on the exhaust valves. The intake cam has mid-position cam lock mechanism that retards the continuously variable timing. It offers expanded valve opening angles (Wide) which enables the engine to operate in a modified-Atkinson cycle at low rpm for improved economy and lower emissions, and in the Otto cycle at high rpm for better performance, while delivering high torque throughout the rpm band. Valvematic The Valvematic system offers continuous adjustment to valve lift and timing and improves fuel efficiency by controlling the fuel/air intake using valve control rather than conventional throttle plate control. The technology made its first appearance in 2007 with the 3ZR-FAE engine in the Noah and later in early-2009 in the Avensis. This system is simpler in design compared to Valvetronic and VVEL, allowing the cylinder head to remain at the same height. VVT-i Oil Supply Hose Issues In 2010, Toyota USA announced a Limited Service Campaign (LSC 90K) to replace the rubber portion of the oil supply hose for the VVT-i actuator on the 2GR-FE (V6) engine, which were found to be defective. In all, approximately 1.6 million vehicles manufactured prior to 2008 were affected. The defective oil supply hoses were prone to degradation and eventual rupture, causing oil to rapidly leak and resulting in permanent engine damage. In 2014, the LSC 90K Campaign was extended to 31 December 2021 on 117,500 Toyota brand vehicles that were "missed" during the initial campaign. See also Variable valve timing Variable valve lift Gasoline Direct Injection (Toyota D4 and D4-S) Variable Length Intake Manifold List of Toyota engines References External links Youtube video: How VVT-i system works Toyota engine VVT-i video animation Video animation of VVT-i can be found here (courtesy of PT. Toyota-Astra Motor, Indonesia) VVTL-i walkthrough VVTL-i flash animation Information about Toyota's Limited Service Campaign 90k Variable valve timing Toyota Lexus