Quote:
Originally Posted by Phase
i tried throwing the numbers around in a calculator and just couldnt figure it out. way too complicated for me
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1)[ dividing 0.20 by 0.24] X 20.3183-hp= 16.9319-hp @ 80-mph @ Cd -.20.
2) 16.9319 hp aero + 11.5347-hp RR = 28.4666-hp Road Load
3) divided by 0.95 mechanical efficiency = 29.964-hp
4) allowing 0.978 accessory efficiency= 30.6380-bhp
5) X 2546-Btu/hp= 78.004.4417-Btu/hour
6) divided by 0.40 thermal efficiency = 195,011.104-Btu
7) divided by 111,836 Btu/gallon = 1.7437-gallons/ hour
8) into 80-miles/hour = 45.878-mpg, @ 80-mph, @ Cd 0.20.
I'm using Af = approx. 24.223-sq-ft ( 85.5% of gross area )
2.2% accessory losses ( Argonne National Lab.)
95% dual-clutch A6 transaxle ( Argonne National Lab.)
3,031-lb EPA dynamometer test weight
Gasoline Direct Injection, Atkinson-cycle @ approx. 40% thermal efficiency
REGULAR Unleaded E10 gasoline @ 111,836-Btu/gallon
I let the rolling resistance just fall out of the math, @ 0.004101/tire