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Old 03-11-2008, 12:30 AM   #1
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Here is my diesel YJ fuel mileage log,pic,and mods, updates

I will continually update this thread to keep everyone informed on the progress, performance and efficiency of my jeep:

3-10-2008
I took a 200 mile round trip today and on the way there I ran overdrive which was lugging my engine at about 1200rpms ( I have 308's and 33's) and I got 20 mpg.
On the way home I ran 4th gear the rpms were sitting at 1800 which is the sweet spot for efficiency and power for this rig and I got 29mpg. I will be taking the same trip tomorrow and I will check it again to make sure I did not make any mistakes on my calculation. Seems to good to be true so I will keep everyone posted on my mileage log. If I can average 20 mpg with around 7"s of lift and 33's I will be very happy.

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Old 03-11-2008, 12:59 AM   #2
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Here are a few pictures of my SOA lift:


This one is of my non completed back bumper I will be putting a tire rack and mounting my jerry cans. Soon.

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Old 03-11-2008, 01:38 AM   #3
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so you got about 20 one way and 29 miles per gallon the other
I wonder what your gas milage would be if you had some lower gears
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Old 03-11-2008, 02:50 AM   #4
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sounds great.. do you have dyno numbers? I wish this will be more common, so parts would be cheaper. but you got a good deal on yours, but not everyone has the details on parts.
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Old 03-11-2008, 08:50 AM   #5
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I may try lower gear in the future so I can run overdrive although the engine red lines at 3,000 rpms so in the mud low gears might rap out really fast!
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Old 03-11-2008, 09:01 AM   #6
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On average, what are the torque numbers for that motor?

BTW neat build.
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Old 03-11-2008, 09:12 AM   #7
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Quote:
Originally Posted by reevesdieselyj View Post
I will continually update this thread to keep everyone informed on the progress, performance and efficiency of my jeep:

3-10-2008
I took a 200 mile round trip today and on the way there I ran overdrive which was lugging my engine at about 1200rpms ( I have 308's and 33's) and I got 20 mpg.
On the way home I ran 4th gear the rpms were sitting at 1800 which is the sweet spot for efficiency and power for this rig and I got 29mpg. I will be taking the same trip tomorrow and I will check it again to make sure I did not make any mistakes on my calculation. Seems to good to be true so I will keep everyone posted on my mileage log. If I can average 20 mpg with around 7"s of lift and 33's I will be very happy.
Not too good to be true at all.
When I had my 03 Ram dually all decked out and loaded with tools it weighed in at about 9,000lbs and I got between 20 and 26mpg highway.
The Cummins is an awesome motor.
I would love to do what you did but I've been concerned that the 4bt is a little heavy for the Wrangler.
How does it ride?
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Old 03-11-2008, 09:32 AM   #8
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cummins rocks

i like the d-rings on your rear tube bumper
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Old 03-11-2008, 11:28 AM   #9
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I do not have dyno numbers however my gto club has meet often were we dyno our cars. Next time I will throw the Jeep up there and see what she pulls. My guess would be around 100 hp and 300 tq.
I added 2 leaf springs up front so the ride is about the same as factory. Does anyone know what the factory 4.2 weighs this is 750 pounds.
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Old 03-11-2008, 11:31 AM   #10
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cummins rocks

i like the d-rings on your rear tube bumper
If you look closely they are mounted on with 2" plate steel. I don't think they are coming of and that pipe is like a 1/4" thick. I had to reinforce the frame to match the strength of the bumper. lol
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Old 03-11-2008, 11:32 AM   #11
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Not too good to be true at all.
When I had my 03 Ram dually all decked out and loaded with tools it weighed in at about 9,000lbs and I got between 20 and 26mpg highway.
The Cummins is an awesome motor.
I would love to do what you did but I've been concerned that the 4bt is a little heavy for the Wrangler.
How does it ride?
Can you really compare the two? I would figure the technology between the two is completely different.
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Old 03-11-2008, 12:08 PM   #12
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20-29mpg, you suck.
go back to 10
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Old 03-11-2008, 12:09 PM   #13
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the 4bt is the same as the ISB just with 2 cylinders cut off. of course skeeter's 03 woulda been a common rail and i think the 4bt is mechanical pump, but the mechanical 12v in the older dodges got consistent 20+mpg
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Old 03-11-2008, 01:03 PM   #14
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Its true they are basically the same thing. As far as technology, diesels are very simple engines the only things that have change is the injectors are fired electronically which simply means they can have more horsepower with less of a threat of burning a hole in a piston. On the newer engines when the comp. senses the egt's are too high it retards the injector timing and changes the pulse width. when my egt's get to high I take my foot out of it or grab a lower gear.lol The older 12 valve cummins is the exact engine I have minus 2 cylinders. The injectors, valves, gear train, rods, etc. are the same. The early 12 valve were extremely efficient b/c they were such low horsepower. Therefore when I get this huge muffler off here and get my air to air installed it is very possible to squeeze in excess of 30 mpg. out of her. By the way even though this is only 105 hp it has a lot more power than factory.
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Old 03-11-2008, 02:01 PM   #15
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does it have a ve pump or a p pump?
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Old 03-11-2008, 02:45 PM   #16
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this one is the ve
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Old 03-11-2008, 08:59 PM   #17
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Simply, awesome. I think it would look better with 35" tires...... If you come up with some lower gears, that would help a little too.
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Old 03-11-2008, 11:43 PM   #18
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Simply, awesome. I think it would look better with 35" tires...... If you come up with some lower gears, that would help a little too.
I agree but at this point I am playing with fuel mileage, so I opted for the smaller tires.
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Old 03-11-2008, 11:47 PM   #19
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I took a 150 mile trip today and averaged 26.7 MPG 90% on the highway and 10% in town. I also had to chase down a gto so my wife could wave at them I think that killed my mileage we were doing like 85-90 mph to catch up lol. have a good evening
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Old 03-12-2008, 09:31 AM   #20
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that GTO is bad...sure sounds good too with those cutouts.

man that is some nice gas mileage.
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Old 03-12-2008, 12:20 PM   #21
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that GTO is bad...sure sounds good too with those cutouts.

man that is some nice gas mileage.
Yea we love our gto she put down 375hp to the rear tire last time it was on the dyno. That car also gets about 29 mpg.
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Old 03-12-2008, 11:12 PM   #22
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I am building a custom dash for the yj so I can install boost, pyrometer, fuel pressure, air tank psi,and air filter gages. I am also installing a belt drive welder. I will mount the control panel for it were the glove box used to be. I,ll be mounting my 110 outlet with the control panel. B/c my welder is also a generator. My goal is to have it finished by Friday. pictures coming soon
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Old 03-17-2008, 09:01 AM   #23
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Went on a camping/ 4 wheeling trip this weekend. Pics are in the trail section. I drover 300 miles and average 23mpg. That is including 2 full days of trail riding. I am having trouble with my clutch though. After I use it for a while the it gets hard to put it in gear and I have to start it in reverse to get it in.
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Old 03-17-2008, 09:26 AM   #24
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You have an AX15 in there right ? I imagine they rate the trannies by some kind of HP/ftlbs that it will take. I'm treading on ground here I have not thought about but maybe there is something like an AX25 ? out there that will handle the power better. I'm guessing. Maybe one of the NV truck trannies or maybe one of the auto trannies to take some of the shock of that high torque diesel. What type of tranny did the frito truck have ?
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Old 03-17-2008, 12:05 PM   #25
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You have an AX15 in there right ? I imagine they rate the trannies by some kind of HP/ftlbs that it will take. I'm treading on ground here I have not thought about but maybe there is something like an AX25 ? out there that will handle the power better. I'm guessing. Maybe one of the NV truck trannies or maybe one of the auto trannies to take some of the shock of that high torque diesel. What type of tranny did the frito truck have ?
The frito lay was an old 4 speed something or other. I will go with the nv4500 eventually. This is defiantly the clutch causing this prob. I will take the master cylinder apart today and shim out some of my free play.
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Old 03-17-2008, 01:40 PM   #26
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The frito lay was an old 4 speed something or other. I will go with the nv4500 eventually. This is defiantly the clutch causing this prob. I will take the master cylinder apart today and shim out some of my free play.
You might want to measure the material on the clutch and see if it's eating it. Am curious though, is the diesel hotter running then the gas engine ? Underhood temps I mean.
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Old 03-17-2008, 03:54 PM   #27
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You might want to measure the material on the clutch and see if it's eating it. Am curious though, is the diesel hotter running then the gas engine ? Underhood temps I mean.
Clutch is brand new. dude seriously I delt with both of my friends gassers overheating all weakend. I run 160 unless I am in a hard pull then we are looking at 180. That is with the factory radiator which was overheating my 4.2.
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Old 03-17-2008, 07:54 PM   #28
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Clutch is brand new. dude seriously I delt with both of my friends gassers overheating all weakend. I run 160 unless I am in a hard pull then we are looking at 180. That is with the factory radiator which was overheating my 4.2.
The heating thing was not about your clutch problem, I was just curious if diesels run hotter. My only diesel experience is with military vehicles, hummers, bradleys, hemmets, etc.
I'm still considering the same thing you did only on an 89YJ and with spring coming won't mind working outside in the gravel. I've just had my fill of freezing my ass off or soaking it putting tracks back on or road wheels and stuff. This new conversion package from Jeep has my interest too though I think it's going to be a lot more than I want to spend even if it is new.
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Old 03-18-2008, 12:04 AM   #29
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The heating thing was not about your clutch problem, I was just curious if diesels run hotter. My only diesel experience is with military vehicles, hummers, bradleys, hemmets, etc.
I'm still considering the same thing you did only on an 89YJ and with spring coming won't mind working outside in the gravel. I've just had my fill of freezing my ass off or soaking it putting tracks back on or road wheels and stuff. This new conversion package from Jeep has my interest too though I think it's going to be a lot more than I want to spend even if it is new.
I understand it defianenlty runs cooler than my 4.2
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Old 04-01-2008, 01:06 PM   #30
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My last tank of diesel I got 26.8 miles per gallon. 80 % highway driving and 20% in town driving.

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