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The diesel cycle starts off with isentropic compression, then some constant pressure heat addtion followed by isentropic expansion.
With the isentropic compression and expansion and constant pressure heat addition that means the more air you can stuff into the engine the better off the entire cycle is for making both power and effiency.
You can do this with a supercharger to some degree, very well with a turbo and some what with water injection or with a mix of them.
3 psi doesn't sound like much. Where I am the pressure is about 12.5psia.
By adding 3psig at 60mph that is putting almost 25% more air into the cylinders of my air loving diesel engine.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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