Re: turbo vs nasp engine sizes Every engine design has different characteristics so I don't think that there is a straight NA/Turbo ratio.
Sticking to my realm of experience:
Ford Cosworth 4 cylinder YB 2 Litre
N/A - Struggling to get over 300bhp = 150bhp/litre
Turbo'd - Over 1000bhp has been achieved = 500bhp/litre
__________________ Steve
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