Quote:
Originally Posted by mav1178
Because, in a nutshell, the technology doesn't reduce tailpipe emissions? I think you already answered the question with your own reasoning.
It's just a marketing name. Honda still uses it because they can get it to meet current emissions standards. Toyota couldn't, so they came out with a different marketing name.
-alex
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I didn't answer my own question. Why doesn't it reduce tailpipe emissions, but i-VTEC does? Aren't they essentially the same thing, and if there was a minor difference causing VTEC to be emissions friendly and VVTL-i to not be friendly, why wouldn't they just make a minor change to it rather than discontinue it?
Marketing...? I don't get what you mean. Toyota didn't change the name of it... they are using VVT-i now, which they had before, which does not include lift and duration (variable valve timing only). Honda is still able to have variable lift and duration in their engines (in addition to variable valve timing obviously), but Toyota only has variable valve timing now... why?
EDIT: Just to clarify, Toyota was using VVT-i before they came out with VVTL-i with the Celica engine (2ZZ-GE). VVTL-i is a more advanced engine technology that allows the engine to vary the cam lift and duration in addition to the valve timing, improving low end torque stability while improving high rpm peak power. In 2006, VVTL-i was unable to meet EURO IV emissions, and was abandoned by Toyota.