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Old 09-25-2012, 12:01 PM   #1 (permalink)
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Join Date: May 2011
Location: Toronto
Posts: 263

Blueberry - '17 Mazda Mazda3 GS
90 day: 32.56 mpg (US)

EVO - '08 Mitsubishi Evolution MR
90 day: 23.82 mpg (US)
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Impreza - When to shift? BSFC & A/F

help me find my sweet spot rpm for shifting and cruising rpm. i have been shifting at 1800-2000rpm at about 95% engine load without any noticeable gain in fuel economy. i have been trying to improve the mileage on my impreza in the city but i cant get any better than 22mpg. i have found an old subaru bsfc map but i think it's irelevant since it's for the old 2.2L with out AVLS (subaru's VVT). here is a dyno chart of 2.5L (red is stock):

according to some dynos i have seen a/f is leanest at 2.3k rpm at wot. i have more charts if needed.


Last edited by ever_green; 09-25-2012 at 12:27 PM..
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