Hypermiling in a Diesel - Page 2 - Fuelly Forums

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

Reply
 
Thread Tools Display Modes
 
Old 06-15-2014, 07:38 PM   #11
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
I agree. Neutral is very effective on diesels.
__________________

__________________






Jay2TheRescue is offline   Reply With Quote
Old 06-16-2014, 01:36 PM   #12
Registered Member
 
Join Date: Jan 2011
Posts: 1
Country: Ireland
Location: Co. Kilkenny
I coast in neutral as often as I can in my 2010 Bravo with 104k on the clock. It seems to work okay for me. Having said that, I rarely go above 95km/hr on the motorway.

__________________

Bolgerwalsh is offline   Reply With Quote
Old 06-16-2014, 01:54 PM   #13
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
There is a fine line between DFCO and Neutral coasting, and it is different on each vehicle. Knowing when to choose which procedure is a big key to maximizing your mileage.
__________________






Jay2TheRescue is offline   Reply With Quote
Old 06-18-2014, 03:22 AM   #14
Registered Member
 
Join Date: Feb 2010
Posts: 31
Country: United Kingdom
Location: North Yorkshire
On HDi engines, which most are now, then coasting in gear but no throttle will use no fuel at all. Coasting in neutral uses some fuel, so you end up using fuel going downhill. This is, however, for systems with a fixed connection between engine and gear (e.g. manual, DSG etc). I'm not sure whether that is true for a torque converter, as you aren't able to push start these either.

So, you need to weigh up the ∂fuel used for acceleration (assuming you haven't been travelling at your desired speed anyway) vs the ∂fuel used keeping the engine idling in neutral.
jostlehim is offline   Reply With Quote
Old 06-18-2014, 06:39 AM   #15
Registered Member
 
Join Date: Nov 2007
Posts: 1,460
Country: United States
Location: north east PA
Many torque converter automatics do have fuel cut off while coasting in gear. If all new ones don't do it now, they will soon for better CAFE numbers.

Older automatics will take some testing, and likely a scangauge or equivalent, to determine if they do. Then they may only do so under limited circumstances.
trollbait is offline   Reply With Quote
Old 06-18-2014, 06:55 AM   #16
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
I realize that there is fuel used in Neutral. The problem is that DFCO does slow the vehicle down. Moderate descents where the vehicle would lose speed if left in gear (and then requiring extra throttle to get back up to speed) is where Neutral would be best. If the descent is steep enough that you can go down in gear and not lose speed, then DFCO is your better option. It all breaks down to how well your particular vehicle coasts.
__________________

__________________






Jay2TheRescue 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
With the Program. shatto General Fuel Topics 5 10-01-2010 04:40 PM
All Licensed Drivers terrapin Fuelly Web Support and Community News 0 08-07-2008 10:49 AM
civic sedan or coupe which is better for FE yzfdallas General Fuel Topics 5 02-21-2008 07:59 AM
Amazed by the SGII GeekGuyAndy General Discussion (Off-Topic) 7 08-19-2007 12:25 AM
PepsiCo Connections? SVOboy General Discussion (Off-Topic) 3 10-12-2006 05:52 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 10:22 AM.


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