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increased boost pressure. I wasn't discussing improvements in VE of the engine, rather, the effect that increased boost pressure has on the volume of air that moves through the pipes. As boost increases, so too does the volume of air that passes through a given cross section of the intake pipe due to a more dense filling of the cylinder. The engine may only displace 3L worth of volume through its two revolutions, but when you are forcing air at pressure into this volume, the volume of air moving through the pipes is directly proportional to the pressure at which you are forcing it. This is because the compressed air is being forced into a cylinder which has lower local pressure than the intake pipes. Take this for example: You have a syringe and you put your finger over the tip and draw the piston back all the way. The piston has displaced that volume, but no air has been displaced into it. When you remove your finger, the vacuum will draw air into the syringe equal to that of the displacement of the piston. However, if you then connect an air compressor to the end of the syringe and force air into the syringe, you are going to have displaced far more air into that syringe than what it did on its own when the piston was drawn back. The difference in the volume is only within the tube leading to the syringe - the piston displaces a given volume but if you force air into the syringe at even greater pressures, rest assurred that more air will actually enter the syringe. The volume increase I am talking about occuring when boost is increased is this additional volume of air that is being blown through the tip into the syringe, or non-metaphorically, the intake piping that is blowing additional air volume into the cylinder.
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