09-18-2018, 10:27 AM
|
#51 (permalink)
|
|
Eco Storm Chaser
Join Date: Nov 2012
Location: Lubbock
Posts: 174
Thanks: 20
Thanked 73 Times in 38 Posts
|
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.
__________________
|
|
|
|
 Today
|
|
|
|
Other popular topics in this forum...
|
|
|
|
|
09-18-2018, 12:47 PM
|
#52 (permalink)
|
|
Eco Storm Chaser
Join Date: Nov 2012
Location: Lubbock
Posts: 174
Thanks: 20
Thanked 73 Times in 38 Posts
|
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
__________________
|
|
|
|
|
09-19-2018, 03:30 PM
|
#53 (permalink)
|
|
Thalmaturge
Join Date: Mar 2011
Location: The edge of nowhere
Posts: 1,160
Thanks: 764
Thanked 640 Times in 427 Posts
|
Is your car a CVT? 70mph MPG seems kind of low.
|
|
|
|
|
09-19-2018, 04:06 PM
|
#54 (permalink)
|
|
Master EcoModder
Join Date: Dec 2011
Location: New Zealand
Posts: 5,023
Thanks: 2,874
Thanked 2,520 Times in 1,559 Posts
|
Quote:
Originally Posted by samwichse
Is your car a CVT? 70mph MPG seems kind of low.
|
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. |
|
|
|
|
09-20-2018, 09:31 AM
|
#55 (permalink)
|
|
Thalmaturge
Join Date: Mar 2011
Location: The edge of nowhere
Posts: 1,160
Thanks: 764
Thanked 640 Times in 427 Posts
|
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.
|
Oops, forgot what thread this was  |
|
|
|
|
The Following User Says Thank You to samwichse For This Useful Post:
|
|
|
09-20-2018, 10:28 AM
|
#56 (permalink)
|
|
Master EcoModder
Join Date: Dec 2011
Location: New Zealand
Posts: 5,023
Thanks: 2,874
Thanked 2,520 Times in 1,559 Posts
|
I'm hoping to still get 60+ with mine, with absurdly tall gearing.
|
|
|
|
|
09-20-2018, 10:47 AM
|
#57 (permalink)
|
|
Eco Storm Chaser
Join Date: Nov 2012
Location: Lubbock
Posts: 174
Thanks: 20
Thanked 73 Times in 38 Posts
|
Quote:
Originally Posted by Ecky
I'm hoping to still get 60+ with mine, with absurdly tall gearing.
|
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
__________________
|
|
|
|
|
09-23-2018, 11:13 AM
|
#58 (permalink)
|
|
Cyborg ECU
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299
Thanks: 2,373
Thanked 2,172 Times in 1,469 Posts
|
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 ...
|
what Cd are you using for that? 0.27?
__________________
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.
|
|
|
|
|
09-24-2018, 10:27 AM
|
#59 (permalink)
|
|
Eco Storm Chaser
Join Date: Nov 2012
Location: Lubbock
Posts: 174
Thanks: 20
Thanked 73 Times in 38 Posts
|
Quote:
Originally Posted by California98Civic
what Cd are you using for that? 0.27?
|
0.24 with a frontal area of 21.4 (mirror delete and lowered)
__________________
|
|
|
|
|
09-26-2018, 09:01 AM
|
#60 (permalink)
|
|
Cyborg ECU
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299
Thanks: 2,373
Thanked 2,172 Times in 1,469 Posts
|
Quote:
Originally Posted by Stacygifford
0.24 with a frontal area of 21.4 (mirror delete and lowered)
|
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
__________________
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.
|
|
|
|
|
