AHH vtec proplems on my b16

ok, i just got my civic back with the swap and have a couple questions, first, how do i know when vtec engages. Second, when i first got the car, last night, when vtec engaged at bout 4800 it pulled hard, now it doesn't, is it not engaging. Third, how do i check if it is engaging. Fourth where do i start looking for the problem, cuz i don't think that it is

Thanks, Evan

hmm do you have low oil? You should hear the crossover on the b16. Possibly you got used to how the car pulls hard and now you can't notice it that much?

low oil motor not warm? you should know when a b16 kicks on.

any ideas on where to start troubleshoting it?