Power boost valves are not essential on a nearly std engine, if youe engine doesnt require the extra fuel at the extra pressure.
Basically, a PBV is a slightly more fiddly fuel pressure regulator. It has a larger diaphram to vacuum response is greater and has a greateer rising rate. Actual base line fuel pressure fluctuates depeding on engine load sensed by teh diaphram which responds to inlet manifold vacuum. Its larger diaphram gives what is basically a more responsive increase/decrease in fuel presure, leading to more fuel being injected per duty cycle.
There is no better PBV as htey all buy from teh same manufactuerer. If you engine gets chipped to supply enough fuel, you wont need the PBV really, if you add it after, you might end up over fueling, or if they get it running spot on, itll be doing eactly what the std regulator did......so nothing.
Give Nick Hill a bell....
