Editing VVT-i (section)

== VVTL-i ==
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[[Image:Toyota 2ZZ-GE.JPG|thumb|The 2ZZ-GE engine, the first and only engine to feature VVTL-i]]

'''VVTL-i''' (Variable Valve Timing and Lift intelligent system) (also sometimes denoted as VVT-iL or Variable Valve Timing and Intelligence with Lift) is an enhanced version of VVT-i that can alter valve ''lift'' (and ''duration'') as well as valve timing. It was introduced with the 16-valve ''[[Toyota ZZ engine#2ZZ-GE|2ZZ-GE]]'' engine found in the 1999 [[Toyota Celica (T230)|Toyota Celica]]. The engine head resembles a typical [[DOHC]] design, featuring separate cams for intake and exhaust with two intake and two exhaust valves (four total) per cylinder, but unlike a conventional design, each camshaft has two lobes per cylinder, one optimized for lower rpm operation and one optimized for high rpm operation, with higher lift and longer duration. Each valve pair is controlled by one rocker arm, which is operated by the camshaft. Each rocker arm has a slipper follower mounted to the rocker arm with a spring, allowing the slipper-follower to freely move up and down with the high lobe without affecting the rocker arm. When the engine is operating below 6,000–7,000&nbsp;rpm (dependent on year, car, and ECU installed), the lower lobe is operating the rocker arm and thus the valves, and the slipper-follower is freewheeling next to the rocker arm. When the engine is operating above the lift engagement point, the [[Engine Control Unit|ECU]] activates an oil pressure switch which pushes a sliding pin under the slipper-follower on each rocker arm. The rocker arm is now locked into the slipper-follower's movements and thus follows the movement of the high rpm cam lobe and will operate with the high rpm cam profile until the pin is disengaged by the ECU. The lift system is similar in principle to [[Honda|Honda's]] [[VTEC]] operation. Toyota has since ceased production of its VVTL-i engines in most markets because it does not meet [[Euro IV]] specifications for emissions regulations. This includes the [[Toyota Corolla|Corolla T-Sport]] (Europe), [[Toyota Corolla|Corolla Sportivo]] (Australia), [[Toyota Celica|Celica]], [[Toyota Corolla|Corolla XRS]], [[Toyota Matrix|Matrix XRS]], and the [[Pontiac Vibe|Pontiac Vibe GT]], all of which had the ''2ZZ-GE'' engine fitted. On the other hand, the [[Lotus Elise#Series 2|Lotus Elise]] and [[Lotus Exige#Series 2|Exige]] continued to offer the ''2ZZ-GE'' engine until 2011, with the Exige also offering the engine with a [[supercharger]].

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