Leviata-N

Im sorry, i wrote spanish, and the people here doesnt like it so I will try to write in english. Im from Costa Rica, and in the past few days I install in my car a S-AFC, I know that this componet has to be or have to be set up using a Dyno, but I now have a question: What mean Narr hvt and Lvt and Wide Lvt and Hvt, I know that my car has to cam low Vtec close and high Vtec open, so Can any body here tell me what this two things do in my car, If I adjust them what and how my car will react. Any way I just take english for two years in the school so I know do not tell me that my english is Bad "please". And if somedy has information about this componet please tell me something. By the way There is a lot o people that speak spanish around the world. ThanX