How much fuel does turning the car on consume? - Page 6 - Fuelly Forums

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

Reply
 
Thread Tools Display Modes
 
Old 11-08-2007, 12:14 PM   #51
Registered Member
 
skewbe's Avatar
 
Join Date: Jan 2007
Posts: 771
Country: United States
here is a zip file with a wav file in it of the engine starting if you want to examine the waveform.
http://www.gassavers.org/attachment....4&d=1185022686

I appreciate that you want to get to the bottom of this, but I think the energy cost of restarting the engine is so small that a scangauge could not accurately measure it.

Look at it this way, I can bump start the engine in my 2000 lb car at 5mph and wind up at, say, 4mph. I'm quite certain I could get back up to 5mph with the fuel that would have been spent idling for 10 seconds.
__________________

__________________
Standard Disclaimer
skewbe is offline   Reply With Quote
Old 11-08-2007, 09:04 PM   #52
DRW
Registered Member
 
Join Date: Oct 2006
Posts: 615
Country: United States
For those of you who intend to measure injector pulsewidth, you will also need to measure how frequently the injectors fire, and you should measure each injector to determine if they're all firing at once or individually.

I don't know about other cars, but I know my car very well. When the engine is started all 4 injectors fire together, it's called 'batchfire' and adds extra fuel for a very brief time, even when fully warmed up. All 4 injectors fire every 1/2 revolution. Once the engine is started the ecu switches to firing the injectors individually, once per 2 revolutions. I imagine other port fuel injection engines may be managed like this.
__________________

__________________
Dave W.
DRW is offline   Reply With Quote
Old 11-08-2007, 10:05 PM   #53
Registered Member
 
Join Date: Aug 2007
Posts: 313
Country: United States
I won't shut off for less than 30 seconds once warmed. I don't pick up pennies and that's all there is if the engines at temp. Cold and it's 4 cents.
__________________
2TonJellyBean is offline   Reply With Quote
Old 11-09-2007, 01:18 AM   #54
Registered Member
 
iwilltry's Avatar
 
Join Date: Aug 2007
Posts: 12
Country: United States
Thanks skewbe,
In the end I put together my own audio-in scope and used data from my car. The results are posted here http://www.gassavers.org/showthread....1052#post81052
I also wrote up the procedure here
http://www.iwilltry.org/w/index.php?...g_your_engine?
__________________
www.IWillTry.org
iwilltry is offline   Reply With Quote
Old 11-09-2007, 02:12 AM   #55
Registered Member
 
skewbe's Avatar
 
Join Date: Jan 2007
Posts: 771
Country: United States
Good work Rob!
__________________

__________________
Standard Disclaimer
skewbe 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
All Licensed Drivers terrapin Fuelly Web Support and Community News 0 08-07-2008 10:49 AM
DIY: Wire Tuck!!! SVOboy Experiments, Modifications and DIY 11 09-21-2006 05:17 AM
Condensator orevgym General Fuel Topics 0 07-23-2006 11:25 AM
"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 10:03 PM.


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