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how can HP increase when engine displacement increase?
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Because the maas airflow of a bigger displacement engine (compairable engine) is bigger, and the total mass of air that gets into the engine determains the amount of power that can be made.
If you increase the pressure of a smaller displacement engine, you get more mass of air in the engine and so more power.
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if you set the twin GTSS turbos to produce 1 bar boost in the 2.6 litre engine, when you use the turbos with the 4.5 litre engine, it will not hold 1 bar boost. Is this true? What are the effects on the horsepower output on the engine?
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1 bar on 4.5 liter means that you have to double the volume that is pumped tound by the 4.5 liter engine, this amount is bigger than the rb26's.
If the amount of airflow to reach a certain pressure is bigger that the turbo's can deliver then the boost will drop, I depends on the max rpm and volumetric efficiency of the 4.5 engine if it maxes out the GTSS's airflow.
But to achieve the same mass air flow as the rb26dett has @ 1 bar @ lets say 8000rpm there are less rpm or less boost requiered for the same result.