led-panzer's 1984 300D 4-speed
led-panzer's 1984 300D 4-speed
It is way more than 4:1 because BSFC is like 70% and the compressor is 70% max efficient. You cannot even burn 120cc of fuel at 4:1 PR. DENSITY ratio yes 4:1. But not pressure. You are looking at 4atm of boost.