if done some research but cant come up with any info on this variable valve timing system...

i have an s14 sr but i dont notice any difference before and after vtc is "engaged" < lol.. because ive ridden in hondas and toyotas that have vvt systems and they're much more noticeable.. (also taking into consideration that they are N/A).. is it just that the nissan vvt sucks? or what? any info would be cool thanks