How much does weight have to do with fuel economy??? - Page 3 - Fuelly Forums

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

Go Back   Fuelly Forums > Fuel Talk > General Fuel Topics
Search Today's Posts Mark Forums Read Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 06-08-2006, 05:42 PM   #21
Registered Member
 
Compaq888's Avatar
 
Join Date: Oct 2005
Posts: 1,460
Country: United States
Quote:
Originally Posted by SVOboy
I think weight is very noticable at the track.

In talking to disco about this at length, I learned that weight's importance increases proportionally to the rate of acceleration.

So, if you floor it to redline everywhere, you might notice the difference, if you drive carefully, doubt it, though it will be there.

Someone should test the weight/CODFISH distance relationship.
codfish???
__________________

__________________

Compaq888 is offline   Reply With Quote
Old 06-08-2006, 05:43 PM   #22
|V3|2D
 
thisisntjared's Avatar
 
Join Date: Mar 2006
Posts: 1,186
Country: United States
Send a message via AIM to thisisntjared
there are soooo many other factors at the track....
__________________

__________________
don't waste your time or time will waste you
thisisntjared is offline   Reply With Quote
Old 06-08-2006, 05:44 PM   #23
FE nut
 
diamondlarry's Avatar
 
Join Date: Sep 2005
Posts: 1,020
Country: United States
I would never say that weight doesn't matter at all. I like how SVOboy said it:

Quote:
SVOboy I think weight is very noticable at the track.

In talking to disco about this at length, I learned that weight's importance increases proportionally to the rate of acceleration.

So, if you floor it to redline everywhere, you might notice the difference, if you drive carefully, doubt it, though it will be there.

Someone should test the weight/CODFISH distance relationship.
In FE however I don't think it is as significant as improving combustion efficiency.
__________________
Horsepower is how hard you hit the wall, torque is how much of the wall you take with you.

2007 Prius,



Team Slow Burn
diamondlarry is offline   Reply With Quote
Old 06-08-2006, 07:02 PM   #24
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Quote:
Originally Posted by Compaq888
Darin removed most of his interior and it looks like his mileage went up. Can anybody do some scangauge testing on this or present scangauge data???
I removed weight for 2 separate runs only, then I put most of it back in again.

I did remove a significant amount: reduced the car's weight by 6.1% - or 112 lbs: passenger seat, heavy rubber (winter) floor mats, cargo shelf, rear seat, spare tire & jack, car tool kit & spares (jumper cables, emergency light, oil, washer fluid etc.)

At the time, I said:

Quote:
I think the added lightness was perceptible. i could shift sooner and not lug. Of course, that could also be the 10-15F warmer temps, the placebo effect, higher tire pressure (from warmer ambient), etc., etc. the car was definitely noisier inside - can't blame that on anything else.
Having made that disclaimer, 2 of the 3 highest segments I've seen to date were with that weight removed.
MetroMPG is offline   Reply With Quote
Old 06-08-2006, 08:58 PM   #25
Registered Member
 
philmcneal's Avatar
 
Join Date: Feb 2006
Posts: 333
Country: Canada
codfish is the new term to describe non hybrid cars who wish to coast with the engine off.

I think 40-50 pounds will make a difference in the low rpms, where torque is lacking.
__________________
If your reading this, then good for you, your saving some gas because your here.
philmcneal is offline   Reply With Quote
Old 06-09-2006, 02:34 AM   #26
Registered Member
 
krousdb's Avatar
 
Join Date: Feb 2006
Posts: 1,480
Country: United States
Location: Raleigh, NC
100 lbs is the difference between climbing a certain hill on my route in 5th or 4th gear. Other than that, I have no data on how it effects FE. For sure, each time you use your brakes you throw away some momentum, which depends on weight. Lower weight means less frictional losses during braking.
__________________


krousdb is offline   Reply With Quote
Old 06-09-2006, 03:59 AM   #27
Registered Member
 
Compaq888's Avatar
 
Join Date: Oct 2005
Posts: 1,460
Country: United States
Quote:
Originally Posted by krousdb
100 lbs is the difference between climbing a certain hill on my route in 5th or 4th gear. Other than that, I have no data on how it effects FE. For sure, each time you use your brakes you throw away some momentum, which depends on weight. Lower weight means less frictional losses during braking.
so it should help.
__________________

Compaq888 is offline   Reply With Quote
Old 06-09-2006, 04:32 AM   #28
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Adding a 1/4 lb worth of ScanGauge would help more.

OH! I just had to get that in there. Old wounds. Pick. pick.
MetroMPG is offline   Reply With Quote
Old 06-09-2006, 04:33 AM   #29
Registered Member
 
Compaq888's Avatar
 
Join Date: Oct 2005
Posts: 1,460
Country: United States
Quote:
Originally Posted by MetroMPG
Adding a 1/4 lb worth of ScanGauge would help more.

OH! I just had to get that in there. Old wounds. Pick. pick.
I'd love to get a scangauge, first I have to pay off my debt thanks to the accident and my rack&pinion blowing a seal.
__________________

Compaq888 is offline   Reply With Quote
Old 06-09-2006, 07:05 AM   #30
Registered Member
 
Join Date: Oct 2005
Posts: 682
Country: United States
There is a fuel economy difference between removing sprung weight and unsprung weight:

If you remove sprung weight, like seats, spare tires and the jack, the car will ride higher, making it less aerodynamic.

If you remove unsprung weight like tires and wheels, you do not change the ride height, and this change doesn't impact the aerodynamics.

In addition, reducing the tire and wheel weight also reduces the angular momentum needed to accelerate them to speed.
__________________

__________________
Capitalism: The cream rises. Socialism: The scum rises.
Sludgy 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
Incorrect Milage Calcuatlion PatM Fuelly Web Support and Community News 4 07-17-2009 08:21 PM
Missing Fuelup jmonty Fuelly Web Support and Community News 3 05-27-2009 05:10 AM
Pulse and Glide? Pete7874 General Fuel Topics 24 02-26-2009 12:11 PM
total fuel cost for fill-up instead of price per gallon EmptyH Fuelly Web Support and Community News 1 08-26-2008 12:14 PM
"active" aero grille slats on 06 civic concept MetroMPG General Fuel Topics 21 01-03-2006 01:02 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 10:17 AM.


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