Compressed air?
Also, we will be able to reduce the boost pressure which will help in improving reliability and will also help us to reduce the size and weight of the cylinder block (less pressure = lesser wall thickness between the cylinder and the outer part of the cylinder block) which means laptime improvement this doesn't stop there, since the size is now reduced it means compact engine and improvements in center of gravity for the engine also this helps us to pack the components much closer, which means tighter aero package, reduction in drag and so many other benefits..........
Forgot an another thing to mention because of the lower boost pressure we don't have to carry as much compressed air as we did before, which also is weight savings coz when more air is compressed into a compartment it gains weight which adds to weight of the car and also the turbo doesn't have to work as hard as it does now.... So that we will be able to change the design of turbo and save some weight savings there too...
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