09-18-2018, 11:27 AM
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#51 (permalink)
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Eco Storm Chaser
Join Date: Nov 2012
Location: Lubbock
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On a road trip yesterday noticed something rather odd.
at 70mph i was cruising at 17.9-18.2 inches of vacuum with tps values from 10-12% returning 38.5-43mpg on flat level ground
at 82mph I was cruising at 18.8-19.1 inches of vacuum with tps values from 14-16% returning 40-42mpg on flat level ground
I tested this multiple times, back to back. no change in temperature, elevation, or wind.
cam phase advance was set at 10 the entire time.
Perhaps there is some sort of standing wave forming in the intake? bad tuning? who knows.
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09-18-2018, 01:47 PM
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#52 (permalink)
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Eco Storm Chaser
Join Date: Nov 2012
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After calculating the hp required for each speed Here
It is not entirely surprising that the 12mph increase has so little impact on MPG for such an aerodynamic car.
15.5 hp required for 70mph
22.9 hp required for 82mph
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09-19-2018, 04:30 PM
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#53 (permalink)
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Thalmaturge
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Is your car a CVT? 70mph MPG seems kind of low.
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09-19-2018, 05:06 PM
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#54 (permalink)
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Master EcoModder
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Quote:
Originally Posted by samwichse
Is your car a CVT? 70mph MPG seems kind of low.
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No, it’s a 200hp 2.4L engine paired with a transmission which was already short when it was in a car with 17 inch rims. Pretty great mpg considering. |
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09-20-2018, 10:31 AM
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#55 (permalink)
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Thalmaturge
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Quote:
Originally Posted by Ecky
No, it’s a 200hp 2.4L engine paired with a transmission which was already short when it was in a car with 17 inch rims. Pretty great mpg considering.
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Oops, forgot what thread this was  |
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09-20-2018, 11:28 AM
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#56 (permalink)
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Master EcoModder
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I'm hoping to still get 60+ with mine, with absurdly tall gearing.
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09-20-2018, 11:47 AM
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#57 (permalink)
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Eco Storm Chaser
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Quote:
Originally Posted by Ecky
I'm hoping to still get 60+ with mine, with absurdly tall gearing.
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ya, I need a 6th gear lol.
This is a crude calculation. I would like to do some testing and plot mpg vs speed in this graph as well
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09-23-2018, 12:13 PM
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#58 (permalink)
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Cyborg ECU
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Quote:
Originally Posted by Stacygifford
... This is a crude calculation. I would like to do some testing and plot mpg vs speed in this graph as well ...
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what Cd are you using for that? 0.27?
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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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09-24-2018, 11:27 AM
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#59 (permalink)
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Eco Storm Chaser
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Quote:
Originally Posted by California98Civic
what Cd are you using for that? 0.27?
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0.24 with a frontal area of 21.4 (mirror delete and lowered)
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09-26-2018, 10:01 AM
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#60 (permalink)
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Cyborg ECU
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Quote:
Originally Posted by Stacygifford
0.24 with a frontal area of 21.4 (mirror delete and lowered)
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When I plug those number into the EM fuel economy tool--keeping the other default assumptions unchanged-- I get a horsepower need of just 7.56 at 60 miles per hour. Your graph seems to show about 10 horsepower needed at 60 miles per hour. Is there something I'm missing about your calculation? Different assumptions?
https://ecomodder.com/forum/tool-aer...resistance.php
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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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