2006 mods vs. technique - Fuelly Forums

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

Thread Tools Display Modes
Old 01-14-2007, 07:02 PM   #1
Registered Member
MetroMPG's Avatar
Join Date: Dec 2005
Posts: 4,223
Country: United States
2006 mods vs. technique

Driving technique won over mods by a pretty wide margin: 37.5% vs. 28.0%. Though you'll have to buy into my "comparison" method to believe it. It's pretty inexact (to say the least...)

Tallying just the mods ...

5.2% tranny swap

10.3% alternator optional

2.3% kardboard kammback

2.3% mirrors

5.7% grille block & rear wheel skirts

2.2% undertray

= 28% total theoretical improvement over base from measured mechanical/aero mods

I'll be the first to admit this tally is flawed on several levels: 1) the weather conditions weren't the same for all tests; 2) the speed wasn't exactly the same for all tests (but close to 55 mph); 3) the effects of individually tested aero mods can't simply be summed because their effects interact with one another ... the car is probably more or less than 28% better with all the mods in place. But the car was never driven with all of them in place at one time and then without.

Driving technique ...

To do this comparison, I looked at 3 tanks in Firefly #1 which were predominantly city driving. When I was using that car, I wasn't employing coasting of any form, or P&G/codfishing, and there were none of the mods listed above.

Firefly #1, 3-tank tally: 1474 km, 83% city driving ... 5.2 L/100 km / 54.0 mpg (Imp) / 45.0 mpg (US)

Blackfly, 3-tank tally: 1724 km, 83% city driving ... 3.3L/100 km / 86.5 mpg (Imp) / 72.0 mpg (US)

If you do the math, that actually works out to a 60.2% improvement for the Blackfly.

The biggest flaws in this comparison are: 1) it assumes the "base" cars are identical (which they were on paper, but probably weren't in reality) ; 2) the Blackfly has some mechanical & aero mods on it that the other car
didn't have. Based on the values in the mods list though, we can correct for these mods:

- 5.2% transmission advantage
- 10.3% alternator advantage
- 1.2% aeromods advantage (calculated based on avg. city speed of 25 mph vs 55 mph for the tests)
- 6.0% rolling resistance (this is a WAG - the Blackfly has LRR tires and higher pressures than the first Firefly had)

-22.7% total deductions (this is actually a liberal estimate, because the Blackfly was not running alternator-less, nor with all aero mods, and the taller tranny was only in place for 2 of the 3 tanks)

= 37.5% estimated difference due to driving technique

MetroMPG is offline   Reply With Quote
Old 01-14-2007, 07:27 PM   #2
Supporting Member
Hockey4mnhs's Avatar
Join Date: Dec 2006
Posts: 760
Country: United States
very cool info

Hockey4mnhs is offline   Reply With Quote
Old 02-04-2009, 02:05 PM   #3
Registered Member
bowtieguy's Avatar
Join Date: Oct 2008
Posts: 1,873
Country: United States
Location: orlando, florida
obviously it is best to "do a search first [dang] it!"

so, performing driving techniques BEFORE attempting mods is advisable.
bowtieguy is offline   Reply With Quote

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
Difficult w/ Fuelly & Blackberry Bster13 Fuelly Web Support and Community News 4 04-01-2012 11:39 AM
SMS feature request linwiz General Fuel Topics 7 07-27-2010 03:14 AM
Things To Look For When Buying A Civic Vx??? panamacolin General Fuel Topics 10 08-15-2008 03:57 PM
Need addresses of recently upgraded members Matt Timion Fuelly Web Support and Community News 2 04-10-2007 05:17 PM
Electric bikes banned in Chinese city to make room for cars MetroMPG Electric and Solar powered 4 11-24-2006 07:29 AM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 02:46 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.