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Also, not all engines are able to fill to same VE at the same RPM. Also, pressure is essentially forcing more air mass into the same volume. PV = NRT. As Pressure increases, SO does Temp for the SAME volume.......
The VE head has the ability to flow MORE MASS of air vs a DE or DET head, hence it is able to get closer to 100% VE without a turbo. Add a turbo, and the above (albeit very simplified) equation comes into effect....
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