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The problem is 1.5 bar would be 1.5 times the mass of air at room temperature...adiabatic compression increases the temperature of the air, and the compressor itself imparts additional thermal energy into the air.
Another thing you're overlooking is that lightweight flywheel does not add crank power. It adds apparent power on a non-constant speed dyno. The true mechanical loss of the transmission and differential is around 10%, not 15%. The stock engine makes 200 at the crank. If you shoved say 1.8 bar into the engine I'd believe you if you said 300hp crank was possible. 1.5 bar, you're not even giving it enough air to make that happen, assuming you have a 100% efficient compressor. It's not even possible if you had a 3L atkinson cycle equivalent engine with 1.5bar.
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