Tuning for maximum MPG? - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
Home Forum Market Place Garage Tuning Library DTC Tool Register Vendors
Go Back   Diesel Place : Chevrolet and GMC Diesel Truck Forums > Power, Performance & Tuning > EFILive Tuning Software
Register FAQ Forum Rules My Replies My Threads Mark Forums Read Advertise

EFILive Tuning Software Discuss custom tuning & data logging the LB7, LLY, LBZ & LMM Duramax engines as well as the Allison transmission with EFILive software.

DieselPlace.com is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 02-15-2016, 08:35 PM   #1 (permalink)
kjwiebe
Low Boost
 
Join Date: Jan 2016
Posts: 5
iTrader Score: 0 reviews

Tuning for maximum MPG?

Looking for advice on tuning (with EFI Live) an '03 LB7 for maximum fuel economy. The truck is basically stock except for a FASS lift pump/filter. I do have a DSP5 switch installed so testing is fairly easy.

Most of my driving is highway 65 to 80 MPH with no load (empty truck).

So what things should i be trying:
  • less/more boost
  • less/more timing
  • less/more rail pressure
I've just starting tuning and have only tried the "20-20 tune" so far. It works fine but doesn't change the mileage and makes more noise. It does provide a bit more power.

I did post this at First Generation Duramax Electronics/Tuners but it was suggested I post this here.

Offline  
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 02-25-2016, 12:08 PM   #2 (permalink)
christopherglenn
Diesel Champ
 
Join Date: Aug 2005
Location: Near Yosemite.
Posts: 1,541
iTrader Score: 0 reviews

I haven't looked at the lb7, but on the lbz from stock, usually less boost, more timing, more pressure in the cruise areas. You have a waste gated turbo, so boost isn't an option. I tuned the Allison to grab gears sooner and hold them longer at low throttle, basically to run at a lower rpm when possible. My "around town" is now 1000-~1400 rpm.

__________________
2007 Chevy Dually CC 4X4 D/A LBZ EFI-Live
2008 Chevy 2500HD CCSB 4X4 D/A LMM EFI-Live
2010 GMC Yukon
2011 Keystone Fuzion 405
2013 Yamaha 242LS
2015 Yamaha Waverunner FX Cruiser SVHO
2016 Chevy Dually CC 4X4 D/A LML
Member # 465 3500 Dually Club
Sold 05 Chevy 2500HD SB 4X4 D/A LLY


Neighbors must think I run a used car lot.
Offline   Reply With Quote Quick reply to this message
Old 02-25-2016, 09:30 PM   #3 (permalink)
kjwiebe
Low Boost
 
Join Date: Jan 2016
Posts: 5
iTrader Score: 0 reviews

One thought I had was to turn off the pilot injection, add timing, lower the rail pressure and increase the pulse time. The idea being to produce a long slow fuel burn and push through as much of the stroke as possible. Is there any merit to that?
Offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 02-27-2016, 01:55 PM   #4 (permalink)
christopherglenn
Diesel Champ
 
Join Date: Aug 2005
Location: Near Yosemite.
Posts: 1,541
iTrader Score: 0 reviews

Generally they sound like crap without pilot. I have had luck moving the pilot closer to main injection. Once the piston gets much past 40 degrees, it is moving pretty fast and a low injection pressure won't burn fast enough to maintain cylinder pressure - you are chasing the piston down. Getting peak pressure up at 10-15 degrees gives a smaller window for work, but many times higher pressure to do the work. The only loss down the stroke is the heat being absorbed by the engine - diesel burns fairly slowly, there will still be some burn at +90 degrees - even if it is a small fraction of when the injector shut off.


Make a dsp5 tune, where all tunes are the exact same, then (I) use tune 2 as a base. 1 and 0 are lower, 3 and 4 are higher. Make one tune with pressure changes, one with timing changes. Find a long, flat road and test with the cruise on and map dsp5 tune, vss, pressure, timing and pulsewidth. Starting out all you are looking for is direction, does the truck like more or less. Take whatever settings work best and set them up the same for all tunes, then spread 0-4 and repeat. Do one thing at a time - either more pressure or timing may be good, both may go to far and be bad. Make multiple tunes before leaving - pressure and timing, and test both on one outing (doing laps). Make a tune without pilot, and see if you like it that way. Personally I prefer the sound of the duramax to the 7.3..
__________________
2007 Chevy Dually CC 4X4 D/A LBZ EFI-Live
2008 Chevy 2500HD CCSB 4X4 D/A LMM EFI-Live
2010 GMC Yukon
2011 Keystone Fuzion 405
2013 Yamaha 242LS
2015 Yamaha Waverunner FX Cruiser SVHO
2016 Chevy Dually CC 4X4 D/A LML
Member # 465 3500 Dually Club
Sold 05 Chevy 2500HD SB 4X4 D/A LLY


Neighbors must think I run a used car lot.
Offline   Reply With Quote Quick reply to this message
Old 02-29-2016, 01:26 PM   #5 (permalink)
kjwiebe
Low Boost
 
Join Date: Jan 2016
Posts: 5
iTrader Score: 0 reviews

Some good ideas, thanks!
Offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Diesel Place : Chevrolet and GMC Diesel Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

PLEASE READ! You must check your email inbox for the confirmation link to complete registration. Please check your spam box if you do not see the email in your inbox.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in


Thread Tools

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
LB7: Tuning for maximum MPG? kjwiebe First Generation Duramax Electronics/Tuners 5 04-20-2016 05:11 PM
MPG Increase on 2007 GMC Classic 2500 Duramax Reef Donkey Duramax Third Generation: 2006-2007.5 (LBZ & LLY) 29 02-24-2016 11:11 PM
How can I get some better MpG out of this girl? Rom828 6.5L Diesel Engine 51 01-04-2016 08:40 PM
Looking for Mpg suggestions on banks 6.2 jordanmilne123 6.2L Diesel Engine 11 11-13-2015 12:08 PM
mpg on a '04 Sierra 3500 with a 6.0L davester GM Gassers 16 09-10-2015 12:52 AM


All times are GMT -4. The time now is 05:16 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Shoutbox provided by vBShout v6.2.1 (Lite) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
© AutoGuide