90' 12V 5.9L Cummins Power & MPG
#1
90' 12V 5.9L Cummins Power & MPG
I have 1990 12V 5.9L Cummins and was wanting to know what I could do to increase power and get better mileage. I get about 16-18mpg in the city and maybe 21mpg on the highway. I'm new to diesels, but I've heard and read articles that you can boost power while increasing fuel economy.
What's the best way to do with with an engine like the one I have? How far can you push it? Is 30mpg highway a reasonable goal?
Thanks in advance for your help!
Michael
What's the best way to do with with an engine like the one I have? How far can you push it? Is 30mpg highway a reasonable goal?
Thanks in advance for your help!
Michael
#2
Join Date: Nov 2009
Location: El Dorado Springs MO
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Do u consider 21 mpg I wish I could get 20 the best I get is about 15 to 16 I have a hard time beleiveing people when they say they get more then 20 miles a gallon because I have owned 2 of these trucks and both of them have gotten the same mpg so If u do get 21 mpg I would be happy with that if u want better mpg get a rice burner.But then its kind of hard to pull a trailer .
#3
Yes, I measured and got 21mpg consistently when the engine was in the Dodge. I've moved it into a 67 IHC crew cab 4X4 which is ironically lighter than the D250 was. The whole point of having a diesel engine is how easy (supposedly) they are to modify for power and fuel economy. And why not push towards 30mpg?! Fuel's not getting any cheaper. I do have a Ford Escort that is my city driver, but most of my trips in the truck are close to 1000 miles pulling a trailer. It adds up.
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Here's other mechanics that factor in to my mpg: I have a 5spd OD Getrag (rebuilt); 3.54 diff gears; 3/4 ton 4X4 with NP205 trans case.
I've been reading diesel mags which suggest that different injectors and/or pumps, or enhances turbos can make a difference. It's fairly common to boost these engines to 400HP, which I don't need as much as better fuel mileage for the long trips I take.
I've been reading diesel mags which suggest that different injectors and/or pumps, or enhances turbos can make a difference. It's fairly common to boost these engines to 400HP, which I don't need as much as better fuel mileage for the long trips I take.
#8
Here's other mechanics that factor in to my mpg: I have a 5spd OD Getrag (rebuilt); 3.54 diff gears; 3/4 ton 4X4 with NP205 trans case.
I've been reading diesel mags which suggest that different injectors and/or pumps, or enhances turbos can make a difference. It's fairly common to boost these engines to 400HP, which I don't need as much as better fuel mileage for the long trips I take.
I've been reading diesel mags which suggest that different injectors and/or pumps, or enhances turbos can make a difference. It's fairly common to boost these engines to 400HP, which I don't need as much as better fuel mileage for the long trips I take.
Oh and another thought. The road from 160hp to 300hp is a rather easy road of simple mods and upgrades. The road to from 300hp to 400hp is a lot more difficult and pricey.
Last edited by TrkEnvy; 01-30-2011 at 08:44 PM.
#10
2 stroke oil.. like for outboard motors or weedwackers or dirtbikes.. The cheapest you can find that is ashless 2 stroke. I usually pick up a couple quarts once a month from the wally world or local auto parts store. Dump a quart in before you pump at the fuel station. It helps and a bunch of guys do it out there. Even 2nd and 3rd genners.