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Actually the test is to show the pressure referenced regulator , and how it will maintain constant effective pressure at any manifold pressure
the original non referenced pump and regulator is preset to 55 psi, then looses effective pressure as the manifold pressure increases
 

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Do you mean exact fuel rail pressure or exact effective pressure
The original has a fuel rail pressure of 55psi, and at the original 18 psi plenum pressure the effective pressure becomes 37 psi
add some gears etc to increase the plenum pressure and the effective pressure drops until you get to the point where fuel flow cant keep up to needs at high rpm where the potential on time for an injector is very short
current fix is the bigger injectors , esp if your using something like E85 that needs ~30% more fuel than gasoline

But were finding now that with bigger compressor wheels and stg 3 or 4 gearing the boost pressure is getting to 28-30 psi and fuel pressure differential between the fuel rail and plenum is down to 25 psi the spray pattern deteriorates and flow decreases ,
pressure referenced is the common way to run a turbo fuel system and logical next step for these
 

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My EC Fuel Pump came factory set to deliver 43.5 psi @ 1 atmosphere, which is what I wanted to reduce amperage consumption on the H2 SX SE+. The reg is easy to adjust to 55 psi over boost pressure if need be.
 
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