Quote:
Originally Posted by oldtamiyaphile
I suspect you know that finding BSFC maps for most cars is impossible. While absolute lowest g/kwh is usually only a very small area of the map, it's usually accompanied by a very large area either side where economy only drops by a few g/kwh. It's fairly easy to find your BSFC sweet spot with an MPGuino or equivalent. You will actually see a dip at BSFC, fuel use will be higher and lower in the torque/rpm/load map. Having a supplied graph is nice, but it's not that hard to do for yourself.
|
MPGunio (or similar) .. can not produce an even remotely accurate BSFC... too many unknown (but involved) variables that those devices can not measure , or account for... They do not show you BSFC .. not dipping or doing anything else.
Remember the difference between Energy Efficiency and Fuel Efficiency.
BSFC Energy Efficiency can go down while MPG / FE goes up ... and vise versa.
For example:
65 MPG @ 70 MPH in a Gen1 Insight is at a significantly higher BSFC ICE energy Efficiency... Than ... 130 MPG @ 30 MPH in the same Gen1 Insight. .. under otherwise the same conditions ... Even though the MPG/FE is much lower.