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Originally Posted by jimepting
As Wayne Gertes over on CleanMPG recently pointed out, BSFC curves aren't really all that valuable for solving the question of optimum RPM in fuel economy terms. The problem being that the BSFC data is for full throttle and that is virtually never the situation when one is attempting to find the best fuel economy.
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Quick BSFC question(geared towards folks with ATs) - Post#19 the post you're referring too?
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___A BSFC map is useless because they are based on WOT. A partial load map is what you would be looking for but an engine or vehicle on a bench does not equate to a real vehicle on the road in - 20 to 110 degree F temps.
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I've seen the numerous instances of the assertion that "BSFC maps are based on WOT", but I've yet to see an authoritative citation to backup it up. I'm no expert, but I find it difficult (if not impossible) to believe that data in the 500 rpm -1000 rpm/15.6 Nm - 31.2 Nm range of this NOT ATYPICAL BSFC map/chart was generated at WOT!
It's not labeled, but I believe the line of heavy dots across the top is the BSFC curve at WOT.