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Old 01-23-2009, 12:45 PM   #3 (permalink)
Left Lane Ecodriver
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Join Date: Aug 2008
Location: Buffalo, NY, USA
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Prius C - '12 Toyota Prius C
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Sure I want to modify it. The engine management software is desperately afraid of stalling, and it's built to endure things like 10W30. I want my ECU to live on the edge a little.

This chart, from a paper by Subaru, shows my engine's BSFC (in grams of gas per horsepower-hour), which is what I need to minimize to get the most oomph out of a gallon. The chart leads to two conclusions: revs bad, using the engine near its capacity at a given RPM good. The latter is achieved with throttle.

I know the above plot represents what the engine is capable of. What I'm not sure of, is whether their test used the same ECU I have. Oh, if I only had a dyno and a laptop-based OBDII data acquisition setup.
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