While googling a BSFC map for my engine I found this document,
Technical Options for Improving the Fuel Economy
of U.S. Cars and Light Trucks by 2010–2015, written in 2001. Of course, they recommend things we all know about, and practice, like reducing load due to Cd, Crr, mass and accessories. Another thing they recommend is 5 or 6 speed electronic transmissions and CVT's, programmed to keep the engine running in it's most efficient rpm range during acceleration. Though they mention this would keep rpm's down, which reduces friction, their focus seems to be on keeping rpm's at optimum efficiency (BSFC) for FE gains. Looks like we're on top of that too.
Other recommendations like Variable Valve Control, direct-injection, and Integrated Starter-Generators are beyond our ability to mod. So we'll have to wait for them to hit the market.
Quote:
Originally Posted by Daox
At WOT plus at peak torque is going to be where your optimal BSFC is.
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Google also found where I had asked that question in this forum: "Does peak torque equal optimum BSFC?".
I had assumed that was the case. Got verification on that, Daox? The document listed above has maps showing a standard engine reaching peak torque well above the optimum BSFC island (while a VVC engine can extend that island to nearly peak torque).