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Old 04-27-2011, 04:06 AM   #26 (permalink)
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Run two stroke or a diesel fuel additive in every tank
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Old 04-27-2011, 04:34 AM   #27 (permalink)
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I use 2 stroke in my 97. I get 12-14 mpg while towing interstate speed depending on winds. Mine is a manual, 3.55s, 35" tires, bhaf, 100 plate, and boost elbow and thats all. I think some timing would really help mine too. I am going to drop the lift and go down to 285s, see what happens then too.
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Old 04-27-2011, 05:01 AM   #28 (permalink)
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Originally Posted by adam90xj View Post
Last time (6 months ago) I averaged 14.88 over the whole trip.

Truck has stock injectors, 181 DV's, 16.5* timing, 30 psi boost, BHAF, 100 plate FF, AFC tuned, 4" exhaust. Damn thing pulled the climbs better than I thought it would. Set cruise at speed and it never dropped. Max EGT's (in elbow behind turbo) 900*. No smoke while climbing either.... just pulled great.
AFC tuned? That can mean anything, was it "tuned" before when you got 14.88? A lot of people that "tune" their AFC, dont know what they're are doing or what they're doing actually cause, which in turn can really fuck up power and MPG's. So I ask what did you do to tune it, what PSI are you seeing full fuel, how much rack travel, and is it still a 180hp pump?

Also, Id slide the plate back and move your egt gauge to where its suppose to be. And for $30 bucks Id get your injectors pop PSI set, they're probably firing all over the place being they're stock.
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Old 04-27-2011, 10:19 AM   #29 (permalink)
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I get around 11 going to Harlan, about 15 on the way home. 97, 3.55's and 285 tires. #10 fuel plate. All new filters and being lite on the peddle towing a 5500lb Toyota.
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Old 04-27-2011, 10:53 AM   #30 (permalink)
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I'd say it was your recent tuning. If you got 14 before - messed with and now get 11 - you messd it up

I left my 12v, automatic pretty much stock (BHAF, afc bumped a little, 15.5 degrees pump timing) and could get 15-16 towing my 7500 pound load. BUT I set the cruise at 62-65 and just take my time, and I had a 2wd standard cab....

The more boost you are making the lower your mpg will be, sure it feels great to power the hills but your mileage is going out the window.

Last edited by uglyscout; 04-27-2011 at 10:54 AM.
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Old 04-27-2011, 11:29 AM   #31 (permalink)
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Slow down, the mileage will improve a lot. I borrowed my neighbors 89 cummins auto, with the empty car trailer behind it at 70 (the rev limiter) it used more fuel on the way down than it did on the way back with 8k lbs behind it. The trailer had some serious sway issues (I ended up in a full lock countersteered slide, both directions, using all 3 lanes of the highway in Hartford CT at 55mph, no trailer brakes) so I crawled it home at 45mph. Loaded, and running for twice as long, it used less fuel to get home.
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Old 04-27-2011, 11:29 AM   #32 (permalink)
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I am no where near stock, but 5spd 3.55's 2wd dually I get about 20mpg empty, and about 13-14mpg towing. IF I am driving it nice, if I have my boot in it, and that 100psi boost gauge is buried, I am lucky to see high single digits.
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Old 04-27-2011, 12:17 PM   #33 (permalink)
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I am no where near stock, but 5spd 3.55's 2wd dually I get about 20mpg empty, and about 13-14mpg towing. IF I am driving it nice, if I have my boot in it, and that 100psi boost gauge is buried, I am lucky to see high single digits.
Wow, bury the 100psi gauge? That's crazy
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Old 04-27-2011, 12:22 PM   #34 (permalink)
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Wow, I can just barely bury my 35 psi gauge. 100 is impressive. Twins? Studs/rings?
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Old 04-27-2011, 01:54 PM   #35 (permalink)
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I am no where near stock, but 5spd 3.55's 2wd dually I get about 20mpg empty, and about 13-14mpg towing. IF I am driving it nice, if I have my boot in it, and that 100psi boost gauge is buried, I am lucky to see high single digits.
100 psi gauge buried? Im gonna throw the bs flag on you, its possible but i dunno if you can do it. Got pics of the set up?
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Old 04-27-2011, 05:56 PM   #36 (permalink)
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I've read all kinds of info on afc tuning but will totally admit that i'm a little I know what each piece does, and why it does it but translating that into seat of the pants feel is difficult.

I've been eying "cleaner" injectors too... might be pulling the trigger sometime next month on some.
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Old 04-27-2011, 06:10 PM   #37 (permalink)
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Ive herad of these getting 30-40 towing but realistic 10 towing at 70 mph is probally right on track.
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Old 04-27-2011, 08:05 PM   #38 (permalink)
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My best tank towing my Jeep with the camper on the truck was 15 mpg on flat interstate going 60-62mph between Sac and Redding last year. I'm going the same way this year and hope to get a bit better, I lowered the truck nearly 3 inches. I was also thinking about building a cheap air dam under the front bumper to so much air from going under the truck, dunno how much it'll help but I'm gonna try it.
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Old 04-28-2011, 05:59 AM   #39 (permalink)
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And for $30 bucks Id get your injectors pop PSI set, they're probably firing all over the place being they're stock.
Care to elaborate on this? How often/when should this be done, and where/what kind of shop does this work?

Thanks,

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Old 04-28-2011, 06:07 AM   #40 (permalink)
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Man, anything over 11 is pretty good to me. I just sold my Tundra and I got 7...yeah 7 mpg towing a buggy in Texas "hills"...back to the 7.3 PSD for me.
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Old 04-28-2011, 06:19 AM   #41 (permalink)
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I've got a '96 and usually see 15-17 towing easily, 20-23 unloaded.
That's about what I got in my 96 12V. Maybe closer to 14 towing - I tended to run 70-75.
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Old 04-28-2011, 02:45 PM   #42 (permalink)
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Have you checked your pre-filter, next to the lift pump?
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Old 04-28-2011, 05:51 PM   #43 (permalink)
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I got 14 mpg towing 7,000 load. The load is a deckover 24ft, weights 2,000 pulling a 5,000 blazer going 70. This is with cruise control and crappy afc tune. It was fun watch the truck launch over the hills without a problem except lot of smokes though.
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Old 04-28-2011, 06:21 PM   #44 (permalink)
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Have you checked your pre-filter, next to the lift pump?
Haven't done that in a couple months but will now.... I've had it clog up before and ran like poo.

I'll call the local diesel shop to see about pop testing. I will also do some research on it because i work at a tubes/hoses/hydraulic/ac etc shop so i might be able to rig something up with our pressure testing bench
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Old 04-29-2011, 07:18 PM   #45 (permalink)
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Have you made sure your cetane is high enough? I'd try running some diesel conditioner and see if your mileage increases. All it takes is one bad tank to screw up your fuel economy.
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Old 04-30-2011, 07:04 AM   #46 (permalink)
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You should be getting 20-25 towing with that setup based off what I have read in the towing section

I would say you did OK but like said already cruise hurts the mileage when towing. The same thing happens on my 6.5 and D max trucks.
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Old 04-30-2011, 09:22 AM   #47 (permalink)
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Can someone school me on how to select an upgraded injector for my setup? obviously I'm not going to super HP but rather the best power vs fuel economy!
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Old 04-30-2011, 10:08 AM   #48 (permalink)
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Can someone school me on how to select an upgraded injector for my setup? obviously I'm not going to super HP but rather the best power vs fuel economy!
injectors should be chosen last in my opinion. and they should not be some off the shelf ones either. Gotta talk to someone who actually knows what they are doing. For example, i ended up going with 7x.010" plus .010 added pintle lift instead of just some 7x.012's.
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Old 05-01-2011, 10:49 PM   #49 (permalink)
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So in the same thread you're bitching about mileage you're looking for bigger injectors?
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Old 05-02-2011, 04:16 AM   #50 (permalink)
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So in the same thread you're bitching about mileage you're looking for bigger injectors?
Bigger injectors don't automatically mean lower mileage. Many vendors and people "claim" that certain injectors give/gave them +1-3mpg. I know marine 370 make power but suffer from poor mileage, high egt's and lots of haze and smoke.

I know that a bigger injector will allow more fuel to be delivered in a shorter amount of time Vs less fuel delivered over a longer time (which is what happens when you grind a plate and slide it FF with stock injectors) The faster the proper amount of fuel is delivered the more efficient the burn, more power, lower egts, and less smoke.

I was looking for resources to properly select said injector. Will be contacting several vendors for suggestions. Any Pirate4x4 supporting diesel vendors?

Last edited by adam90xj; 05-02-2011 at 04:17 AM.
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