Hiya Moggy Noir...
Not sure I agree with all your post..
Firstly, the atomisation peak occurs at a given point after ther opening period starts (a bit like a valve in an inlet port). So on closed loop the duration will reduce with increase pressure. It is debateble whether the increase peak spray is more beneficial than a sustained pattern of lower peak over a longer period.
Secondly, my understanding of the PBV is that it is a rsing rate device. ie, as the pressure differential in the inlet system drops, the fuel pressure regulator increases the line pressure. Surely this is why you can sometimes feel better response (as opposed to pressure dropping - which it wont on a properly regulated system).. this is acting like a pump jet on a carb system.
On open loop, yep, the fuel pressure increases, hence the amount of fuel delivered, hence richer.
It all depends on how cautious the manufacturer was in the balance of power v economy as to IF a power increase will be seen, or, just wasted fuel.
The lower end cars actually seem to benefit more due to a more agressive economy biased setting, as opposed to a sports version..
I think they are actually a bloody good device in the right circumstances - usually a NEED for an increase mixture at top end due to other mods.
the BIG problem is the lack of linear adjustment.. ie, it is extremely difficult to get the correct curve, the settings are minutely critical, and seem to drift with temp and age.. other than that, as said, great on a modified lump or a lower spec model biased for economy.
Joe.
