NVCS is OFF from 0 - 1050rpm, then ON until 4700rpm, then OFF again until redline.
Therefore the NVCS advances cam from 1050 until 4700rpm then it switches off allowing "normal" cam timing.
If the vct was wired up to be engaged all the time it would be advanced from 0rpm to redline... this would affect power, hence my first post.
If left disconnected top end power will not be effected only power to 4700rpm