What happens at 3400rpm?

[maximapitko]

Hello guys,
I've noticed that around 3400rpm the sound of the engine changes a bit and I can deff. feel a little kick in the power. You can reallly feel/hear it in 2nd gear(manual). I know it has something to do with the vvt-i but I was wandering if somebody here can go technical on the topic. Also, I've noticed that the fuel economy goes down quite(sp?) a bit if I go beyond 3400rpm. Thank you!