7th gen civic leanburn? / scangauge question - Fuelly Forums

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

Go Back   Fuelly Forums > Fuel Talk > Hypermiling
Search Today's Posts Mark Forums Read Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 05-10-2008, 10:50 PM   #1
Registered Member
 
GasSavers_Diemaster's Avatar
 
Join Date: Sep 2005
Posts: 163
Country: United States
7th gen civic leanburn? / scangauge question

i got my scangauge setup to read MPG, engine load, GPH, and avrage MPG. when i'm coasting and take my foot off the gas it says 9999MPG and 0.00GPH. it's done this since i've updated it to have XGAUGE too. my interpratation of this is that the computer has sut off the injectors causing leanburn.

my question is does that sound right and do 7th gen civics have leanburn like the VX's do?

also if i set it up to hybrid can i shut the ign off to kill the motor going down a hill and still get MPG numbers?

it's a 2002 civic EX D17A2 w/ VTEC-E, CA emmisions.
__________________

__________________
I ♥ my EM2


Need this stuff gone!
http://www.honda-tech.com/zero...67053[/B]
GasSavers_Diemaster is offline   Reply With Quote
Old 05-11-2008, 07:59 AM   #2
Registered Member
 
suspendedhatch's Avatar
 
Join Date: Apr 2008
Posts: 445
Country: United States
Send a message via AIM to suspendedhatch
Shutting off the injectors isn't running lean. It's running no fuel at all. No mixture is being burned. What you're seeing is DFCO, for Decel Fuel Cut Off. Honda implemented this as early as 1988, as soon as they started putting computers in cars.

When you let off the throttle above 1000 RPM, the injectors stay shut. The road pushing on your wheels, through the axles, through the transmission and clutch, pushes the crank and keeps the engine running. This has a very small benefit to mpg unless you can really exploit it on long downhill coasts. Mostly it's done to increase engine braking, decrease emissions and extend engine life. Squirting fuel into the combustion chamber when it's not needed causes it to run rich and this washes the oil off the combustion chamber walls increasing friction with the piston rings and poor sealing for blowby gasses to escape by.

Being that your engine is VTEC-E, I'm sure it has a version of lean burn probably comparable to the CA version VX. There are emissions restrictions and the lack of a wideband limiting how lean the calibration can go.
__________________

__________________

Civic VX, D15Z7, 5 Speed LSD, AEM EMS, AEM UEGO, AEM Twin Fire, Distributor-less, Waste Spark
suspendedhatch is offline   Reply With Quote
Old 05-11-2008, 08:49 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
Hmm...I think this answers my unanswered question about the scangauge's GPH reading. I posted asking if it actually measures GPH or if it merely calculates it based on other variables. Granted, it doesn't answer the question conclusively, since the SG could just be detecting DFCO...
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 05-12-2008, 10:11 PM   #4
Registered Member
 
GasSavers_Diemaster's Avatar
 
Join Date: Sep 2005
Posts: 163
Country: United States
ok so it does shut off the injectors but how do i know if it has leanburn or not. i'm avraging 30-32 mpg now and my goal is 40+ mpg.
__________________
I ♥ my EM2


Need this stuff gone!
http://www.honda-tech.com/zero...67053[/B]
GasSavers_Diemaster is offline   Reply With Quote
Old 05-13-2008, 08:11 AM   #5
Registered Member
 
palemelanesian's Avatar
 
Join Date: Apr 2013
Posts: 364
Country: United States
Only the 49-state HX version has leanburn. The CA HX version does not. So yours does not have it. sorry.
palemelanesian 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
air quality Erdrick General Discussion (Off-Topic) 4 09-11-2007 07:14 AM
Hypothetical test vehicle. mustngr Aerodynamics 6 07-21-2007 03:13 AM
GM: Petrol is Dead Silveredwings Automotive News, Articles and Products 6 06-13-2007 12:06 AM
cool little car boofighter General Fuel Topics 10 06-03-2007 07:55 AM
"Lean Cruise" ECU Modification Thoughts GasSavers_scostanz General Fuel Topics 12 07-11-2006 05:36 AM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 10:34 PM.


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