VVT-I improves the way your Toyota engine breathes – to provide optimum fuel economy performance and responsiveness, and lower emissions. It saves you money by deciding when your engine takes its next breath and how it uses that breath.
Toyota VVT-I makes optimum use of two different aspects of a petrol engine's operation. In some driving conditions, such as climbing hills, it improves your engine's volumetric efficiency or the work done from each milliliter of fuel. In other driving conditions, such as when your engine is idling, it varies what is called the valve overlap-the period when the exhaust valves are closing and the inlet valves are opening.
VVT-I builds on advances Toyota made in engine breathing and hence, engine efficiency, with its "O2 Advantage" Double Overhead Camshaft or DOHC.
In a conventional engine, valve timing is fixed at a compromise setting, which is applied to different driving conditions-from idle through to sporty driving. This creates inefficiencies in the way the engine breathes, thereby wasting fuel and increasing emissions. However, with VVT-I, inlet camshaft timing is varied according to your needs.
Special attention is given to the Dual VVT-I V6 engine series which is developed using the best of engine technologies. In the Philippines, the 3.5-liter variant of the Camry is powered by this technology, with the aim of pursuing the fun of driving while improving environmental performance. The introduction of this state-of-the-art technology in the 2006 2GR-FE engine enables it to control not just the intake as in conventional engines, but the exhaust camshaft as well for optimum valve timing based on driving conditions. This considerably improves engine performance, providing excellent fuel economy and reducing exhaust emissions. So while the Camry's 3.5-liter engine provides maximum output of 277Ps/6,200 rpm and maximum torque of 346Nm/4,700 rpm, it maximizes petrol usage and remains friendly to the environment.
VVT-I is standard equipment on the petrol engines of many of Toyota's products sold here in the Philippines. Toyota's passenger car line-up, including the Yaris, Vios, Camry and the all-new Corolla Altis, are all powered by VVT-I engine technology. Commercial vehicles Avanza, Previa and RAV4, and the gasoline-fed variants of the Innova, Hilux and Fortuner are also equipped with VVT-I technology.