Quote:
Originally Posted by Kwiatek
Sure i will be happy with E-4/N too even it was very rare plane in BOB and it doesnt change too much in low level speed for 109 but mostly at higher alts if you know 
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Based on the specifications of 500 km/h for the Bf 109E series with DB 601Aa (with 1045 PS), the resulting extra power of the DB 601N (1175 PS, and much more at altitude) in the E-4/N should be good for about 515 km/h at SL.
At the critical altitude of 4800 m the E-4/N has 1175 PS compared to 960 PS of the DB 601Aa, so the E-4/N is probably good for about 600 km/h at altitude.