How VVTL-i Works

How VVTL-i Works

VTL-i builds on the foundation of the VVT-i system but adds an exciting sporty dimension to an engine whilst still maintaining good fuel economy and low emissions.

In addition to varying the timing of the intake valve, VVTL-i controls the amount of intake and exhaust valve lift which optimises engine power output.

The VVTL-i system features on the 1.8 litre 2ZZ-GE engine, which powers the new model Celica.

•VVTL-i uses a cam changeover mechanism that increases the amount of intake and exhaust valve lift when the engine is operating at high speeds. The mechanism uses a unique rocker arm assembly with intake and exhaust camshafts that have two different types of cam lobes on them.


•The lift of the intake and exhaust valves can be increased, allowing for a greater volume of fuel/mixture to enter the combustion chamber.


•Additional engine power at engine speeds above 6000 RPM is produced due to the dramatically improved engine breathing.

For the new model Celica, VVTL-i offers all the advantages of VVT-i with the bonus of a dramatic power increase once the 6000 RPM threshold is reached and then keeps on delivering right up to the 7800 RPM limit.

This ensures a pleasurable driving experience around town with useable low and mid range power but enables exhilarating performance for open highway cruising or blowing out the cobwebs on your favourite stretch of back country roads.