well from the R32 to the R34 Nissan used the RB26DETT. if you want to know how a car works inside out check out
How Stuff Works , to make a car go faster theres 2 roads you can take. one of them is NA(natural aspiration) tuning, NA tuning generally requires alot of internal work and have a higher compression ratio, nitrous also fits into this catagory. the other one is FI(force induction) which forces more air through the intake. there are 2 forms of FI, a Super Charger is driven directly off the crank and theres the Turbo Charger which is driven by the exhaust.