[jared1]

I just bought a dodge with the 6.7 liter in it. I already have taken off the egr and ran a straight pipe from the turbo back. Also running a h&s mini maxx. I want better mileage and was hopeing somebody could point me in the right direction.

Thank you.

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[Cwilliams]

Light foot. Once your fully deleted there's really nothing else you can do. Unless you wanna spend big money and you still may not gain much. Turn your programmer up and drive with a really light foot and you should yield better mileage. Keep stock tires size and no lift.


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[jared1]

If i have everything deleted...what degree should i run the injection timing with the h&s mimi maxx

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[jtstuedle]

Need to update my sig, but I'm getting approximately 18.5 hand calculated, stock size tires with the winter blend diesel - These trucks aren't made for mileage, so I figure at 18.5, I'm doing pretty dang good. It was sitting around
19.5-20 with the summer blend...and before I wrecked it and did ~$19-20k in damage to her . Full synthetic oil seemed to make a small difference for me as well. Not an extreme amount, but I did notice a very slight increase in the way it ran.
Rundown of my Mods:

H&S Mini Maxx - Usually stick to running it on Wild power level, again I don't do any towing, and when I play around I am conscious of temps/pressures.

AFE Bladerunner Manifold - Didn't really notice a huge difference from doing this, MAYBE .2-.3 miles a gallon, and a little less grumbly idle/exhaust sound, and it looks good under the hood.

XDP Fuel Rail Plug - I did this because I was taking my stock manifold off and it was right there. I don't do any heavy towing, and I use my gauges on my Mini Maxx to monitor the rail pressure when I'm playing around. Heard too many horror stories of fuel being bled back into the tank and the truck not starting because of the banjo bolt.

4' Turbo back exhuast - Necessary for the deletes. Made a huge difference.

S&B Air Intake - Made the turbo whistle a little louder, slight mileage gains, not really noticable.

Sinister EGR Delete - Done at the same time as the exhaust (no longer needed the sinister EGR blockoff after I got the AFE).

I don't know what kind of mileage you're looking for, but driving with a light foot has been the only thing that really helped me other than the deletes.

 

[jared1]

When you did you mini maxx...what did you set your injection timing to? Also i really appreciate the input.

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[jtstuedle]

I left it on the default level. I did play around with it some but it I never noticed any difference in fuel mileage.

 

[beauabston]

I left it on the default level. I did play around with it some but it I never noticed any difference in fuel mileage.

I don't have the mini but remember reading a thread that stated not to run default timing at stock or mild tunes. Might be worth looking into.

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[jtstuedle]

I researched it a bit when I was playing around with it - found a thread from H&S located here: H&S Performance :: Topic: Minimaxx adjustable timing (1/1)
...---Taken from HS Forum above........
"Although I cant really answer the techincal aspect of your question...I don't know that you going too see much advantage advancing the timing unless you have some more fuel delivery upgrades...I currently have mine set to the most agressive (5)...But I also have a FASS, injectors, and a modified CP3...The best answer you prob going to get is just to experiment a little and see what setting may work out best....

Technically, the adjustment only affects MAXIMUM injection timing. The only time the truck will actually go above lets say 20 degrees is at wide open throttle about 2000 RPM. The adjustment does not affect pulse width."

The timing is electronically controlled - adjusting the timing with the mini maxx probably isn't going to make a difference without an upgraded fuel system...

I will do a little more digging to see if I can find anything about running it on the default level. Thanks!

 

[beauabston]

I thought it was HG failures due to the timing causing high DP. If I think of it I'll post back.

Amsoil Direct

 

[jared1]

I had the timing set on the the highest running on wild. I seemed to get a better fuel mileage. As of right now i am running through them at different levels to see what is the best. I really do appreciate all the help. I will be ordering my intake soon. Im either going with the s&b or the afe stage 2. I think im going to get the afe, just because i will be doing a injector upgrade and a different fuel pump.

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[beauabston]

http://www.cumminsforum.com/forum/4...-careful-default-timing-no-power-setting.html

Amsoil Direct

 

[rtc1757]

Ive got the Mini max and 5" turbo back.
Iset my timing up a couple from default and it seemed to help mpg.
It runs 20-21 on the highway so far. Better if I keep the speed under 70

Rick

 

[jared1]

I have the first gen 6.7 in a 2500, 4 door long box. Im not even close to that mileage. I also have an automatic. Starting to think i should do a manual on it.


5" turbo back
Egr delete kit
H&s mini maxx


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[logan_abrams]

So just some useful info for anyone who is interested. So I tried searching "mpg" on auto guide and nothing turned up- app still has a few loose ends... This was the first thread I could find with anything relating to mpg.

So I got a 07 6.7 mega 3500 with an HS mini max, a HS egr delete and bypass, a flow pro 5" turbo back cat and dpf delete and a k+n cai.

Prior to deletes, I would get 22-24 highway at sea level with no mountains or load on the truck.

Now I went on first roady without mountains or a load and on mild I recorded 18.75 mpg and on stock or no power I got 14.25 mpg on same speeds and flat Iowa/Nebraska flat highways with cruise...

So now it is 2:45 am and I am in Omaha heading to Denver and I am flicking it to wild to see what it does. I will report back in a few hundred miles...

By the way I am on winter blend now and was on summer blend with the 20-22...


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[logan_abrams]

So I just calculated my wild mpg and it was 15.36. My fuel filter and oil were changed prior to trip and tire pressure 52. Air filter cleaned and oiled prior. Damn I need a Prius! Lol

What other mods can we do for mileage?


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[pwr2tow]

Get rid of that junk K&N. You have oil residue on your maf & ait sensors. That's what's giving you crappy mpg.

Clean sensors with maf cleaner or non-chlorinated brake cleaner. While your at it clean the map sensor on drivers side in the air horn, takes a torx head.

 

[kawakx125]

I'd like to know how you were gettin 20s before deletes

 

[logan_abrams]

Good to know! I'll do that and I do make sure not to oil the k+n too much. I've never cleaned sensors, and I don't know how either but I promise you I was getting that mpg...


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[pwr2tow]

Good to know! I'll do that and I do make sure not to oil the k+n too much. I've never cleaned sensors, and I don't know how either but I promise you I was getting that mpg...


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Use a dry filter only, diesels pull too much air stripping the oil out of oiled filters.

two on air filter box just spray off with cleaner I mentioned in earlier post, remove the one on air horn. spray with cleaner, reinstall, enjoy.

Were the MPG hand calculated or going off the over head display. Over head display is called the lie-o-meter for a reason. Although the lie-o-meter does have merit, if it drops like you say then the hand calculation would also.

 

[logan_abrams]

All hand calculated. The over head is a pathological liar...


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