Editing VVT-i (section)

== Dual VVT-i ==
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[[File:BEAMS 3S-GE Black Top.JPG|thumb|The BEAMS 3S-GE 5th-generation engine ("Black Top"), the first to feature Dual VVT-i]]

The '''Dual VVT-i''' system adjusts timing on both the intake and exhaust camshafts. It was introduced with the [[Lexus IS (XE10)|Altezza RS200's]] ''[[Toyota S engine#3S-GE|3S-GE]]'' engine in 1998. Dual VVT-i was later used in Toyota's 3.5-litre ''[[Toyota GR engine#2GR-FE|2GR-FE]]'' V6 engine, first appearing on the 2005 [[Toyota Avalon|Avalon]]. This engine can be found on numerous Toyota and Lexus models. By adjusting the valve timing, engine start and stop occurs almost unnoticeably at minimum compression. Fast heating of the catalytic converter to its light-off temperature is possible, thereby reducing hydrocarbon emissions considerably. Most Toyota engines including the [[Toyota LR engine|1LR-GUE]] ([[V10 engine|V10]], used in the [[Lexus LFA]]), [[Toyota UR engine|UR engines]] ([[V8 engine|V8]]), [[Toyota GR engine|GR engines]] ([[V6]]), [[Toyota AR engine|AR engines]] (large [[I4 engine|I4]]), [[Toyota ZR engine|ZR engines]] (medium [[I4 engine|I4]]), and [[Toyota NR engine|NR engines]] (small [[I4 engine|I4]]) use this technology.

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