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Old 01-01-2015, 10:56 AM   #91 (permalink)
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Just played around the tool and it would be super sweet if you could add multiple engine efficiency numbers based on speed. You can "easily" calculate those from BSFC maps. Then the calculations would be more accurate at wider range of speeds.

Now in this calculation I know I will get 3 liters at 62 MPH with actual 36% efficiency speed but its off 40 MPH speed. I know the efficiency at 40 MPH in my car will be about 33%. That aint big difference but if you use that 5-200 MPH calculation there start to be some real differences in engine efficiency. I can calculate multiple points and make my own chart but maybe it would be easier if the program would do it automatically if you add your engine efficiency point there?

Aerodynamic & rolling resistance, power & MPG calculator - EcoModder.com


Less drag = Less fuel
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Old 01-01-2015, 11:23 AM   #92 (permalink)
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I plugged in my numbers using .015 for Crr and .8 as drivetrain efficiency and the mpg numbers matched what I've been seeing on the instantaneous readout from my tripminder.

Now to see which metric returns the biggest difference in mpg with the least amount of change!
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Old 01-01-2015, 11:48 AM   #93 (permalink)
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It looks like, if I reduce my curb weight by 200lbs, swap in a manual transmission and shave .02 off of my drag coefficient I should be able to hit 31.3 mpg @ 55 mph... in theory.
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Old 04-17-2016, 11:24 AM   #94 (permalink)
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Hmm...I'm not sure if my "metro" 1.0l engine will be able to put out the 282,372 watts of power required to get me up to 200mph. Maybe if I remove the passenger side mirror...
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Old 06-09-2018, 02:27 PM   #95 (permalink)
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I just ran some calculations with this tool. I appear to only need 10.71 to sustain 60mph in my current configuration, give or take depending on my assumptions for the calculator. That is not a lot of horsepower!

Yesterday I had to commute 150 miles for work & got a 64.4 mpg average WITHOUT nearly as much EOC as I used to do (which was all the time). My new taller tires and the repaired head gasket have produced better numbers, I think.

See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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Old 06-09-2018, 03:48 PM   #96 (permalink)
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Assuming the most correct numbers I can cobble together, it's a bit pessimistic, but I'm (educatedly) guessing at too many variables to begin with.

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Old 06-14-2018, 02:24 PM   #97 (permalink)
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Originally Posted by MetroMPG View Post
Aerodynamic & rolling resistance calculator - EcoModder.com

Back in the day, krousdb made a spreadsheet to calculate aero & rolling resistance forces against his del Sol, their respective power requirements, and effect on fuel consumption at various speeds.

I've ported/expanded the spreadsheet into an online tool which asks you to enter or accept default values for...
- vehicle weight
- Crr (coefficient of rolling resistance - .008 represents a low rolling resistance tire on a smooth surface - see Wikipedia for other sample values)
- Cd
- Frontal Area
- Fuel energy density (in Watt hours / US gallon)
- Engine efficiency
- Air density (rho)
... and it spits out a table showing resistance force values, estimated power requirements and fuel consumption across a range of speeds.

It's online at EM here: Aerodynamic & rolling resistance calculator - EcoModder.com

It's not perfect (e.g. engine efficiency changes with load in real life, but remains fixed at the value you supply for all speeds in the calculations for fuel consumption).

Discussion, questions, suggestions welcome.
Is there some kind of a database that offers this information for all make and models? Thanks!
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Old 06-14-2018, 03:29 PM   #98 (permalink)
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Automobile-Catalog the complete Catalog of Cars, car specs database

Bunch of info can be found here.

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