MAX Mileage!!! Hard Parts Discussion - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by Diamond3Max, this thread has received 8 replies and been viewed 948 times.

 
LinkBack Thread Tools Display Modes
post #1 of 9 (permalink) Old 04-22-2008, 07:30 PM Thread Starter
Senior Member
 
Join Date: Aug 2007
Posts: 129
Points: 1,041
Thanks: 0
Thanked 1 Time in 1 Post
MAX Mileage!!! Hard Parts Discussion

I want to get everyones opinion on what they think the absolute best mileage a Duramax can get is.

Lets have a few factors that are constant. Someone who drives the speed limit, doesnt race, doesnt tow, drives 50%/50% city/highway, keeps tires at 60psi, synthetic throughout, etc.

I want to talk hard parts, cams, heads, overdrive units, etc.

What mileage could a guy get with and custom EFI tune solely for mileage, aftermarket cam (2 mpg increase in a cummins), Gear Vendors OD, Built tranny for effeciency, and a FASS to keep the fuel free of air.

I know the initial cost would be outrageous but what kind of mileage could this truck get? I would like to guess at 24-26mpg.

Lets hear some other Ideas.

Jamie

2003 GMC LB7 DMax/Alli, 4" Exhaust w/ Muffler, 6" Rolled Edge Tip, AFE Drop-in Filter, 16x9 Moto Metal 951's, 285 BFG A/T, Debaged, Full Tint Job, Denali Grill, B&W TurnoverBall, 7" In-Dash DVD Toushscreen, Clear Headlights


Wreck' em Tech


SINGLES CLUB MEMBER #21

FOR SALE $23,500
Diamond3Max is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 04-23-2008, 01:26 AM
Senior Member
 
Join Date: May 2005
Posts: 3,939
Points: 48,668
Thanks: 27
Thanked 60 Times in 44 Posts
Hard parts? None that I know of. Throwing good money away to try that route.

IMO, exhaust is probably the only one. But tuning? Definitely a lot to find there.

Believe it of not, but a guy over at DP (marcdeluca) makes a propane kit that helps a lot with mileage.
TheBac is offline  
post #3 of 9 (permalink) Old 04-23-2008, 03:06 AM Thread Starter
Senior Member
Threadstarter
 
Join Date: Aug 2007
Posts: 129
Points: 1,041
Thanks: 0
Thanked 1 Time in 1 Post
I know that propane helps but your also spending another $2.75 gallon on propane.

I know that in a cummins a cam will increase fuel mileage 2 mpg across the board, city/hwy and towing. A cam for the Dmax is about $1000. I would say, at least that much to have one put in, maybe more.

I have a hard time believing that putting a cam in a motor would yeild the same performance.

There has got to be some things that can be done to a motor to make it super effecient yet still have the parts to lay down 500hp.



If you can build a motor to go 5k rpms and handle 100psi of pressure surely you can build on that can get 25-27 mpg.

Jamie

2003 GMC LB7 DMax/Alli, 4" Exhaust w/ Muffler, 6" Rolled Edge Tip, AFE Drop-in Filter, 16x9 Moto Metal 951's, 285 BFG A/T, Debaged, Full Tint Job, Denali Grill, B&W TurnoverBall, 7" In-Dash DVD Toushscreen, Clear Headlights


Wreck' em Tech


SINGLES CLUB MEMBER #21

FOR SALE $23,500
Diamond3Max is offline  
post #4 of 9 (permalink) Old 04-23-2008, 11:24 AM
Senior Member
 
Join Date: May 2005
Posts: 3,939
Points: 48,668
Thanks: 27
Thanked 60 Times in 44 Posts
Only hard parts that we have are to address longevity (rods, pistons, etc), not necessarily to address mileage. Most of the hard parts are performance oriented, too. I do not know of anything that has been specifically marketed to increase mileage. I'm sure anything that increases airflow and efficiency will increase mileage, but IMO, you're spending a lot of money for little gain if you try that route.

Dmax is a decent engine vis-a-vis handling different tuning. There doesnt seem to be any oddities in the engine design where it cant handle different changes in tuning. You can have a dsp2 or 5 setup where you have a mileage tune and also a 500rrwhp tune.

Tuning is where the gains are to be had.
TheBac is offline  
post #5 of 9 (permalink) Old 04-23-2008, 11:34 PM
Senior Member
 
Join Date: May 2005
Posts: 3,939
Points: 48,668
Thanks: 27
Thanked 60 Times in 44 Posts
to add:

From all I've read over the years, the best things to do to get better mileage include:

1) Stay with stock or near-stock tire height
2) Keep RPM <=2000
3) hard tonneau cover (the "wagon train" ones actually cause more resistance
4) no jack-rabbit starts
5) use cruise control on the highway as much as you can

Also, read this thread if you dont believe me about that propane kit helping mileage. http://www.dieselplace.com/forum/sho...d.php?t=234693
TheBac is offline  
post #6 of 9 (permalink) Old 04-24-2008, 01:45 AM
2nd Gen Guru
 
Mopar1973Man's Avatar
 
Join Date: Dec 2008
Location: New Meadows, Idaho
Posts: 2,641
Points: 55,330
Thanks: 9
Thanked 140 Times in 131 Posts
Garage
Send a message via Yahoo to Mopar1973Man
TheBac is right...:Thumbup:

I've changed back to a stock road radial tire (Michellins's 265/75 R16) added a AirDog 150 pump and slowed down to a MAX Speed of 55 MPH and now getting excellent MPGs!

You might want to read my write up...
http://mopar.mopar1973man.com/2002-d...-mpgs/mpgs.htm

Then Check out my BOMB's :Thumbup:
http://mopar.mopar1973man.com/2002-dodge/bombs/bomb's.htm

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
Mopar1973Man is offline  
post #7 of 9 (permalink) Old 04-24-2008, 11:21 AM
Senior Member
 
Join Date: May 2005
Posts: 3,939
Points: 48,668
Thanks: 27
Thanked 60 Times in 44 Posts
Ya know....since fuel costs are going up and up and up....I can see the US returning to 55mph speed limits in the future. But thats a whole 'nother can o' worms....
TheBac is offline  
post #8 of 9 (permalink) Old 04-24-2008, 01:13 PM Thread Starter
Senior Member
Threadstarter
 
Join Date: Aug 2007
Posts: 129
Points: 1,041
Thanks: 0
Thanked 1 Time in 1 Post
I went to my parents house this past weekend which is about 315 miles round trip. I drove 60 mph there and back, now i do have 285's and had the 65 hp tune loaded at the time. I got around 18 mpg.

I know that propane helps with fuel effeciency, but there is somthing about having a propane tank in my truck that I dont like. I know the kits themselves are safe.

I have found that I get the best mileage with the 120hp tune loaded in my truck also. I have re-loaded that tune and will be traveling 600 miles this weekend. Im gonna try to keep it around 60-65mph and set what happens.

Thanks for the input guys, I was just kind of thinking out loud.

Jamie

2003 GMC LB7 DMax/Alli, 4" Exhaust w/ Muffler, 6" Rolled Edge Tip, AFE Drop-in Filter, 16x9 Moto Metal 951's, 285 BFG A/T, Debaged, Full Tint Job, Denali Grill, B&W TurnoverBall, 7" In-Dash DVD Toushscreen, Clear Headlights


Wreck' em Tech


SINGLES CLUB MEMBER #21

FOR SALE $23,500
Diamond3Max is offline  
post #9 of 9 (permalink) Old 04-24-2008, 01:24 PM
2nd Gen Guru
 
Mopar1973Man's Avatar
 
Join Date: Dec 2008
Location: New Meadows, Idaho
Posts: 2,641
Points: 55,330
Thanks: 9
Thanked 140 Times in 131 Posts
Garage
Send a message via Yahoo to Mopar1973Man
Quote:
Originally Posted by Diamond3Max
I have found that I get the best mileage with the 120hp tune loaded in my truck also. I have re-loaded that tune and will be traveling 600 miles this weekend. Im gonna try to keep it around 60-65mph and set what happens.

Jamie
Why not try setting your cruise for 55 MPH and see a bigger increase in MPGs... Trust me it really does work!

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
Mopar1973Man is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Truck Forum - TheDieselGarage.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome