In my Elantra, it's done with oil pressure and has 4 modes. Toyota's system I'm mostly unfamiliar with, except for a little experience with VVTL-i on an 03 Celica GTS. In that case the "i" stood for intelligence, not intake.
Ryland, the system you mentioned is similar to what the 97-02 Escorts had in the 2.0L Split Port Induction CVH series engine. I had one, and when that second intake runner opened, you could definitely feel it.
I'm attempting to find the CVVT info for my car to post - I should be back with that data soon.
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