Excessive fuel consumption
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Elder User
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From: Near the ocean
Excessive fuel consumption
My truck is running excellant and I am happy with the mileage. (15 town-18Hwy) My problem is, every time I put a significant load on it(usually my 27 foot 5th wheel trailer) the mileage drops to 10MPG. I have tried driving 60-65, out of overdrive, in overdrive, on level ground. I just can't seem to get any better than 10MPG. I am very careful with the throttle. No black smoke on takeoff. I still have origininal NA injectors and IP pump in it. Do you guys have any suggestions? I believe I have a 3.55 rear end in it. It's been a while since I had it out on the road but I seem to remember 2200 RPM @ 70MPH Thanks. Tom
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Elder User
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From: Near the ocean
.I have a Banks Turbo installed. I was thinking since I installed the turbo, I should change the injectors to higher pressure (G) style and maybe a new IP. I would imagine the timing needs to be changed (advanced?) now with turbo. Anyone got suggestions?
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Joined: Nov 2003
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From: Nutter Fort, WV
Best results are changing the IP and injectors at the same time.
Advancing the timing also helps power.
The G code injectors and the DB2-5069 were the setup in the 7.3 turbo with an automatic from the factory.
Advancing the timing also helps power.
The G code injectors and the DB2-5069 were the setup in the 7.3 turbo with an automatic from the factory.
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Elder User
Joined: Jul 2006
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From: Near the ocean
Originally Posted by Dave Sponaugle
Best results are changing the IP and injectors at the same time.
Advancing the timing also helps power.
The G code injectors and the DB2-5069 were the setup in the 7.3 turbo with an automatic from the factory.
Advancing the timing also helps power.
The G code injectors and the DB2-5069 were the setup in the 7.3 turbo with an automatic from the factory.
The G code injectors and DB2-5069 IP you mention, are those what you recommend for mine with the aftermarket turbo?
Thanks for the reply Dave. I was hoping you would jump in there. What is your opinion as to my mileage? My RPMs are 1900 @60MPH so I THINK I have a 355 rear end. Correct? As you see in my sig, I have gone to the effort to get it to breathe better. I just feel I should do better than 10MPG towing. Tom
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
1900 RPM with an E4OD works out to 4.10 gears and 61.5 MPH with 235/85-16 tires in overdrive.
Is your trailer a flat bed or a box trailer?
I tow heavy a lot, but what I normally tow has almost no frontal area to catch the wind.
Here in the mountains I get 9 or so towing even though it has no frontal area.
Dragging an RV or big box trailer that has a big front on it can be even harder to drag than 14 or 15 thousand pounds on a flat bed is here in the mountains.
I ran over through the mountains yesterday to my grandmother's house to have dinner.
Driving my truck 8000 pounds empty and running grades in the 12 to 14 percent average I am expecting the MPG to be about 11 with my truck.
Yes, I was passing cars running up and down the mountains.
I have DPS Stage 1 injectors with a modified 7.3 turbo pump on my 6.9 turbo.
Black smoke anytime I ask for it with my right foot.
My timing is set to where i have a loud Power Stroke rattle when the timing advance is on.
When the advance kicks off the rattle stops, but just barely.
Is your trailer a flat bed or a box trailer?
I tow heavy a lot, but what I normally tow has almost no frontal area to catch the wind.
Here in the mountains I get 9 or so towing even though it has no frontal area.
Dragging an RV or big box trailer that has a big front on it can be even harder to drag than 14 or 15 thousand pounds on a flat bed is here in the mountains.
I ran over through the mountains yesterday to my grandmother's house to have dinner.
Driving my truck 8000 pounds empty and running grades in the 12 to 14 percent average I am expecting the MPG to be about 11 with my truck.
Yes, I was passing cars running up and down the mountains.
I have DPS Stage 1 injectors with a modified 7.3 turbo pump on my 6.9 turbo.
Black smoke anytime I ask for it with my right foot.
My timing is set to where i have a loud Power Stroke rattle when the timing advance is on.
When the advance kicks off the rattle stops, but just barely.
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