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Originally Posted by Bugmenot
Regular vvt-i doesn't have lift. With stepless, you can have a seamless "lift" at any rpm you want not like VVTL-i where you can only have lift at higher rpms and also you get valve variations in vvt-i for fuel economy. It's more like a mix of all the vvt technologies into one, but more efficient.
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That is incorrect. VVT-i in any form deals ONLY with variable cam phasing. There is no variable exhaust and intake cam lift (through multiple cam switch overs) in Dual VVT-i or VVT-i regardless of rpm.
To clear difference among each, this is the simplest definition of each:
VVT-i has variable valve timing only on intake valves (accomplished through constant cam phasing).
Dual VVT-i has variable valve timing on both intake and exhaust valves (accomplished through constant cam phasing of both intake/exhaust).
VVTL-i has variable valve timing only on intake valves + variable cam lift on both intake and exhaust cams.
