Quote:
Originally Posted by aerohead
1) Technically, we'd never know if the BSFC was drifting around on the engine map.
2) And in the past, it was discovered that 30% of streamlining benefit could be lost if gear-matching wasn't accomplished to keep a constant load on the engine after aero modifications.
3) With modern, EFI, and high sampling rates, compared to carbureted vehicles, it may be that BSFC isn't as unstable as in the past. I couldn't prove it one way or another.
4) Universities competing in the mileage marathons typically have a fuel tank that can be weighed to ascertain the mass of fuel consumed over a measured distance. Thermal volumetric expansion wouldn't enter into the calculus. The only unknown you're solving for is mpg based upon the fuels mass. Easy.
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BSFC, fuel consumption and fuel density have nothing to do with throttle-stop testing.