What Language in "MPH" should we be testing at. - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

View Poll Results: What speed for testing.
70mph? 2 13.33%
65mph? 9 60.00%
45mph? 1 6.67%
or combined with an average? 3 20.00%
Multiple Choice Poll. Voters: 15. You may not vote on this poll

Reply
 
Thread Tools Display Modes
 
Old 07-21-2010, 09:49 PM   #1
Lean Burn Mode
 
pgfpro's Avatar
 
Join Date: Feb 2010
Posts: 401
Country: United States
What Language in "MPH" should we be testing at.

I was talking with a friend today about doing some FE testing and I told him that my plan was to run no faster then 45mph for the whole test so I could get killer results. He thought that was not a fair test, because most people would not run that slow.

He said it should be at 65mph because that's what people judge for the most part MPG. Plus he said it shows what the whole car is capable doing including the aero of the vehicle.
__________________

__________________
pgfpro is offline   Reply With Quote
Old 07-21-2010, 11:15 PM   #2
Registered Member
 
fowljesse's Avatar
 
Join Date: Mar 2008
Posts: 188
Country: United States
I would vote 65, also. My car starts to lose FE due to aero drag at about 68.
45 may be too slow, anyway, depending on where your peak torque is.
__________________

fowljesse is offline   Reply With Quote
Old 07-22-2010, 03:47 AM   #3
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
What are you testing, what point are you trying to prove, and for whom?
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 07-22-2010, 04:13 AM   #4
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
I agree. 45 would produce the best results, but 65 is a better speed to use if you want to find "real world" type results.
__________________






Jay2TheRescue is offline   Reply With Quote
Old 07-22-2010, 08:15 AM   #5
Lean Burn Mode
 
pgfpro's Avatar
 
Join Date: Feb 2010
Posts: 401
Country: United States
Quote:
Originally Posted by theholycow View Post
What are you testing, what point are you trying to prove, and for whom?
Testing all three of my cars but mostly my Honda.

My point is that you can make changes to your car to increase the FE over stock.

To show everyone that's interested in FE. But it seems like we need a common language or mph that people can relate to.

Question the A.M.E.C. runs. When I tell people about what their doing, the first question is why are the going so slow. So I explain the major advantages to running a car at 45 mph verse 65 mph.

Most people think that I should do my testing the way its known to the average car owner (city-mpg and freeway-mpg)
__________________
pgfpro is offline   Reply With Quote
Old 07-22-2010, 08:23 AM   #6
Registered Member
 
Join Date: Dec 2007
Posts: 618
Country: United States
I'd say the biggest thing that people who aren't into hypermiling or modding for FE don't understand (or tolerate...) when speaking about gains is any time the car is either out of gear or moving with the engine off.

Leave it in gear, leave the engine running, prove mileage gains based on physical changes to the car alone (aero or mechanical)... then you'll have some believers.

I told a few friends about the HAI when I first did it and they were like, "Wait, you drove it normally. You didn't ever coast in neutral or cut the engine off and you got 43mpg... just from that HAI thing? DAMN! What's that car rated to get?" I told them 31 highway and one said, "can you help me build one for my car?" lol
__________________
John
'09 Saturn Aura 2.4L
'94 Chevy Camaro Z28 (5.7L 6sp)
'96 Chevy C1500 (5.0L 5sp)
'08 Kawasaki Vulcan 900 Custom
'01 KTM Duke 2
Project84 is offline   Reply With Quote
Old 07-22-2010, 09:00 AM   #7
Registered Member
 
slogfilet's Avatar
 
Join Date: Apr 2008
Posts: 112
Country: United States
Location: Vancouver, WA
When I do testing, I do it at the speed at which I'll be driving: 55mph (plus or minus a bit.)

In order to extrapolate the data to different speeds, you really need multiple data points. Some engine mods or general driving habits may scale linearly with speed... aero mods would probably not be so linear. For each change, a minimum of 3 data points (3 different speeds) would at least point to the type of scale to expect. Actual results will vary significantly from driver to driver and car to car (and with a whole slew of environmental variables.)

I guess it comes down to the fact that none of us are doing this in a controlled environment... there are so many variables involved that strictly controlling vehicle speed won't be enough to get repeatable/reliable results; we're ballparking it to the best of our ability. But that's NOT to say it isn't an important factor... doubling your mileage isn't actually that great if it only happens at 5 mph. =)
__________________
slogfilet is offline   Reply With Quote
Old 07-22-2010, 10:10 AM   #8
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
That is correct. I get readings from my scangauge that average about 35-40 MPG in my truck, but it only happens on flat roads when cruising at about 42-44 MPH. I can't do that on the highway. The best I can do at highway speeds is about 18-19 MPG. For this reason I actually get better mileage on 2 lane country roads than I do on the highway. I can putt down a country road at 2 or 3 MPH under the limit and not cause a safety hazard.
__________________






Jay2TheRescue is offline   Reply With Quote
Old 07-22-2010, 11:31 AM   #9
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
If you're trying to convince average drivers of a modification's efficacy, you should control your variables to match theirs as much as possible. That means driving like they do, the same speeds as they drive, same habits, etc.
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 07-22-2010, 12:36 PM   #10
Lean Burn Mode
 
pgfpro's Avatar
 
Join Date: Feb 2010
Posts: 401
Country: United States
Good stuff everyone!!! Thanks everyone for your input!!!

OK I think my next test will be at freeway speed and average around 65mph. Plus I'm going to have 4 different people drive the car for this adventure to take the driver out of the equation.
__________________

__________________
pgfpro is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Engine size?! DuckFeet Fuelly Web Support and Community News 1 04-25-2012 10:58 PM
What do you run: SVO, WVO, BioD, or other? SVOboy Vegetable Oil and BioDiesel 12 02-04-2010 05:13 AM
Nuclear Power on Today's NPR's Science Friday GasSavers_maximilian General Discussion (Off-Topic) 9 06-08-2009 01:35 PM
Transmission choice for best fuel economy Matt Timion General Fuel Topics 6 11-09-2005 09:37 AM
DiamonLarry - is this true? (hydrogen-boost) Matt Timion General Fuel Topics 4 09-28-2005 11:09 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 10:47 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.