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Yeah honda was first to put variable valve timing on a production car, i'm pretty sure it was developed in F1 but i really don't remember if it was so don't quote me on that. Anyway toyota and nissan both started putting VV technology on their cars after honda. Toyota's system has always been a better system than honda's because their vvt-i system has always been continuously variable on the intake side, honda just put out i-vtec, which as you know is continuously variable on the intake side. It's just that toyota doesn't make as big a deal as honda does.
BMW's double VANOS system is continuously variable on both the intake and exhaust cams.
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