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Old 01-26-2012, 05:47 PM   #31 (permalink)
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I have a strip of roadway 1.1 miles long that I identified today. The slope is also more gentle. From a dead stop today I coasted to 45mph during the coast, then slowed to about 43mph before I will have to brake for a light. 45mph is not really all that fast, but the distance is better. And that slowdown from 45mph to 43mph near the end would change notably if the drag were changed significantly. I need a rout by Saturday or Sunday. And yes, I'll do multiple runs. I figure A-B-A-B with three separate runs for each "A" and each "B". Twelve total. Should I use the 45mph 1.1 mile hill or the 55mph 0.5 mile hill?

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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 01-26-2012, 06:03 PM   #32 (permalink)
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Originally Posted by California98Civic View Post
Should I use the 45mph 1.1 mile hill or the 55mph 0.5 mile hill?
You should use the one that lets you coast from to a stop to a stop or find yet another hill. It will eliminate any subjectivity or bias (conscious or unconscious) from effecting the results. This is the scientific method. Set a good example for your students.
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Old 01-27-2012, 12:34 AM   #33 (permalink)
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Originally Posted by ConnClark View Post
You should use the one that lets you coast from to a stop to a stop or find yet another hill. It will eliminate any subjectivity or bias (conscious or unconscious) from effecting the results. This is the scientific method. Set a good example for your students.
Oh now you did it! Set a good example for my students, huh! Now that's checkmate! Ugh... looking for another hill I go...
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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 01-27-2012, 01:33 PM   #34 (permalink)
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Sorry to play dirty I'm sure there are some back roads some where near you. You might also be able to tie your test in as an educational experiment and get cooperation with the city and the police to shut down a street temporarily to allow you to do the test. There would be some paperwork but it would be good publicity for the school and an educational experience for the students.
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Old 01-27-2012, 03:57 PM   #35 (permalink)
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California98Civic -

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Oh now you did it! Set a good example for my students, huh! Now that's checkmate! Ugh... looking for another hill I go...
I'm about 2 hours away, but I don't have the time :

http://ecomodder.com/forum/showthrea...nia-12053.html

Have to call ahead to make sure it's not closed due to rain or having an event.

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Old 02-01-2012, 04:48 PM   #36 (permalink)
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(Bump)

Any updates?
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Old 02-03-2012, 09:58 PM   #37 (permalink)
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(Bump)

Any updates?
Yes, two sets of figures. We tested a colleague's 1992 Corolla, taking it just as it was. We drove it for a baseline fuel economy (got 30.09 mpg mostly highway).

Then we slapped several mods on it and did a coast down test: pumped up tires to 50psi, grill block, huge air dam, wheel skirts. All cardboard, duct tape, and blue painter's tape. She was ugly!

To test these mods we had to use the less-than-scientific hill because of time constraints. We did three runs without mods and then three with mods on a one mile course, recording speeds at two points down the hill. First we recorded peak speed and then we recorded residual coasting speeds at a marked point along a flat straight-away. The mods yielded +4.1% top speed reached and a +9.1% in final coasting speed retained. The students were amazed. I was very clear with them about the limits of our method, and that the results could not be regarded as "scientific" even though methodically reached.

After the coasting test, we did another MPG test. But we first added to the equation several hypermiling techniques on-top of these mods: weight reduction (taking two students out of the car), driving a slower freeway speed (55mph instead of 60), and mild EOC hypermiling in the city routes leading to the freeway. The new MPG rating, baring pump error--an issue I taught the students about--was 45.26 mpg.

All of this was methodical though clearly not "scientific" and I made them aware of the difference.

Broadly, what they learned was that using a variety of techniques and mods, you could possibly improve your MPG by 50% virtually overnight.

They're forming a student club to pursue the issues, histories, and techniques more than a mere three week course allows...

It was fun. Thanks for your input.

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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.




Last edited by California98Civic; 02-03-2012 at 10:12 PM..
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