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Christ · 11-28-2008, 05:37 PM

Early shifting still works to an extent, since even in Vtec mode, the higher you rev, the more fuel units per minute you're using.

If your a/f ratio is a constant 13:1, and you're revving 2000 RPM with an engine that has 1.0 liters displacement, vs revving 1000 rpm with the same displacement (not counting volumetric efficiency, as this is just an example), you're using 2x the fuel per minute.

The difference comes with gearing. Are you using more or less fuel per distance?

11-28-2008, 05:37 PM	#41 (permalink)
Christ Moderate your Moderation. Join Date: Nov 2008 Location: Troy, Pa. Posts: 8,919 Pasta - '96 Volkswagen Passat TDi 90 day: 45.22 mpg (US) Thanks: 1,369 Thanked 430 Times in 353 Posts	Early shifting still works to an extent, since even in Vtec mode, the higher you rev, the more fuel units per minute you're using. If your a/f ratio is a constant 13:1, and you're revving 2000 RPM with an engine that has 1.0 liters displacement, vs revving 1000 rpm with the same displacement (not counting volumetric efficiency, as this is just an example), you're using 2x the fuel per minute. The difference comes with gearing. Are you using more or less fuel per distance? __________________ "¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"