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-   -   New Ram Cummins- and long distance running (https://www.cumminsforum.com/forum/3rd-gen-non-powertrain/2497825-new-ram-cummins-long-distance-running.html)

Marquis Rex 04-08-2019 12:07 PM

New Ram Cummins- and long distance running
 
Greetings!
First I'd like to say I'm happy to be a part of this community. The FB groups can get down right nasty and abusive, but I've been observing here and everyone seems to be quite nice so far.
I bought my 2005 Dodge Ram 2500 Cummins last year, and it saved me from spending a whole load of money on a new F250.

I wanted to get a truck before all the emissions complications.

I was in Arizona on business and couldn't believe the condition of the body. Amazing.

Brought it back up north, got it ziebarted.

With 185 K miles on it I knew The trans and the injectors were the issues I'd have to watch. Saving up for a firepunk reinforced trans, I had a sticking-injector-run away incident.

Anyway, injectors have been changed for ones tailored to my specs. 8 holes, hydro ground and matched holes.
More on my injector choice in another thread.

Until I reinforce the trans I'm not doing anything silly in terms of power, so I decided to focus on fuel economy.

I've been remapping the ECU myself using HP Tuners.

First, a little about me, I'm an vehicle and powertrain development engineer. I've been involved in several automotive, light , medium and heavy duty diesels as well as the development of petrol engines also.

It's still an iterative process.

In a nutshell, I upped the rail pressure at the appropriate duty cycle load points, advanced the injection timing (its quite obvious looking at the 05 cummins maps and piston bowl design (a shallow bowl rather thana re-enterant-2-step bowl), a very high priority was given to lowering NOx emissions without using external EGR and/or aftertreatment at the expense of engine efficiency).

I also messed with throttle progression, and closed up the injection pulse widths to compensate for my injectors.

I got 19.95 mpg driving down from Chicagoland to Indiana, some in heavy traffic,
Then 20.67 mpg, heavy traffic and slower highway speeds.

Then up to Minnesota- 19.44 mpg (going pretty fast, not hanging about- really giving it some!)

Worst I got, "not hanging around"- was 18.4 mpg.

I plugged in some of the 3rd Gen particulars into my simulation package. Simulation alone is dangerous, but when done in league with real world- it really allows good understanding of whats going on:

Now, I put my simulation through the Federal Highway Test.

You will see a 48RE ram vs a NV5600. 1st pic is with NV5600, second is 48RE and third shows a 48RE with a hypothetical 3.42 rear end and my bigger tyres (stock diameter is 31.6 inches, my 285/7- R 17s are apparently 32.7 inches diam). The problem I have with the Federal test is that they don't change up to 6th on the NV5600. Nevertheless, the test is more representative of the driving I did in Chicagoland in some traffic and then going down to Indiana.

It also shows that with a 3.42 rear end, the engine operates at higher load, where it runs more efficiently, better 'BSFC' or brake specific fuel consumption.


The pics show where the Ram 'sits' on the engine speed map and therefore the best place to concentrate when re-optimizing the map for best bang for buck. A Ram 2500 probably uses about just under 100 Bhp to maintain 75 mph. Compare that to the 37 bhp or so to push a 2000 model year Jaguar XJR through the air.

This is why slower traffic runs, even with some stop and go traffic are often better in terms of mpg than constant 75 mph runs.

Marquis Rex 04-08-2019 12:10 PM

Ugh- having trouble uploading my pictures!

4everlearning 04-08-2019 02:43 PM

Subscribed. Iím interested in how this turns out

utahtrapper 04-08-2019 03:09 PM

Interested as well

Marquis Rex 04-08-2019 03:16 PM

Can anyone help me post pics? I wanted to show the engine speed-load map of the Ram over road use?

Does the upload feature work? When I drop in there- it doesn't upload

4everlearning 04-08-2019 04:15 PM

I upload using Tapatalk, so Iím not sure

cpitock 04-08-2019 05:17 PM

@steve05ram360

Welcome! You'll find Steve and myself as big mileage guys that are both very passionate about tuning for efficiency. I'm glad to see another engineer dipping into this looking for mileage. Steve has a similar pickup to you, but mine is a 6.7. You will find that those piston/injection angle designs aren't quite as efficient as the 03-04 and 6.7, but can still get some really good mileage.

Marquis Rex 04-08-2019 05:44 PM

HI Cpitock, yeah, doing a search I stumbled across a lot of Steves threads and yours and his dialogues!

Very informative. Totally agree regarding the bowl design. I'll cover my conundrum on that on another thread in the powertrain section when I have the time!

How do either of you post pictures? Does that drag and drop thing work for you?

Cheers

jham's 06' 5.9L 04-08-2019 05:54 PM

Are you posting via phone or computer?

I know on my phone which I use the most to post on here there is a little paperclip icon in the top right that allows me to post pics or whatever within reason! I haven't used my PC in awhile to post on here but I seem to remember a similar icon thing there..

cpitock 04-08-2019 06:00 PM

Quote:

Originally Posted by Marquis Rex (Post 28950739)
HI Cpitock, yeah, doing a search I stumbled across a lot of Steves threads and yours and his dialogues!

Very informative. Totally agree regarding the bowl design. I'll cover my conundrum on that on another thread in the powertrain section when I have the time!

How do either of you post pictures? Does that drag and drop thing work for you?

Cheers

In the reply boxes there is a paperclip that you hit, if you haven't posted much, you might not have reached min. requirements.

utahtrapper 04-08-2019 10:11 PM

I thought there was minimum number of Posts but it had been a long time I was not sure

steve05ram360 04-09-2019 02:19 AM

I use smugmug... Had photosucket but they wanted a large sum monthly to post pics... Smug mug was $5.

Cody this is the thread you mentioned...? Looking in the wrong forums... Doh!


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