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Old 02-19-2019, 08:33 AM   #29
laj
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MPG of truck carrying truck camper?

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Originally Posted by Electrojake View Post
There's plenty of RV owners that couldn't tell a clogged fuel filter from a smoked lift-pump, no less do a complete engine swap.



I dont mean to sound rude here, and I'm certainly no mechanic, but I have a profound respect for those can do whatever needs to be done on their equipment as the need arises.



You should take some pictures during the job and post a thread after you get done.

Best regards & happy wrenching!

-Jake-


Jake, i have about 50 pics that are of the first one i did in 81, but their on real film. sorry, never got into digital cameras, still shoot with film.
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Old 02-19-2019, 09:55 AM   #30
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Quote:
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Jake, i have about 50 pics that are of the first one i did in 81, but their on real film. sorry, never got into digital cameras, still shoot with film.
Old-school... No problem!
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Old 02-19-2019, 01:30 PM   #31
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When I posted "another thought is that there are usually always lower gears to go to, but the highest is as far as it goes" I was thinking that whatever diff ratio you have is fixed, but there are nearly always lower gears to go to in the transmission. If it is too low (higher numerically) the vehicle top speed will be limited, if it is a little high there will nearly always be lower gears in the transmission to lower the final drive ratio. Personally, I would prefer a bit on the higher side to lower for that reason.

Our Dodge Cummins W250 had 3.54 diff gearing and Getrag 360 od trans which I thought was a good compromise. The truck ran at about 1900 rpm at 70 mph and got 15-16 mpg with the camper on (11k lbs gross weighed). Empty mpg was 21-23 at 70 mph.

The Ford F250 4wd 6-354 Perkins diesel conversion had 4.10 diffs and required two transmissions with a combined od of .62 to overcome the lower diff ratios and produce about the same rpm, mph, and mpg as the Dodge.


I don't know about gas engines, but it is my belief that running a diesel at or a bit past peak torque will provide the best fuel economy.

Steve
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Old 02-19-2019, 05:18 PM   #32
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Originally Posted by dix39 View Post
When I posted "another thought is that there are usually always lower gears to go to, but the highest is as far as it goes" I was thinking that whatever diff ratio you have is fixed, but there are nearly always lower gears to go to in the transmission. If it is too low (higher numerically) the vehicle top speed will be limited, if it is a little high there will nearly always be lower gears in the transmission to lower the final drive ratio. Personally, I would prefer a bit on the higher side to lower for that reason.

Our Dodge Cummins W250 had 3.54 diff gearing and Getrag 360 od trans which I thought was a good compromise. The truck ran at about 1900 rpm at 70 mph and got 15-16 mpg with the camper on (11k lbs gross weighed). Empty mpg was 21-23 at 70 mph.

The Ford F250 4wd 6-354 Perkins diesel conversion had 4.10 diffs and required two transmissions with a combined od of .62 to overcome the lower diff ratios and produce about the same rpm, mph, and mpg as the Dodge.


I don't know about gas engines, but it is my belief that running a diesel at or a bit past peak torque will provide the best fuel economy.

Steve


thatís what we did, was put 3 spd brownies which gave us 3-400 rpm splits. it was great, and gave us good power and mpg.
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Old 03-10-2019, 11:01 AM   #33
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I got 11.5 with my Duramax coming west on I90 from Spokane, to the Tacoma area Friday.


This is my truck and some of the upgrades I did to it for camper hauling.
I haul a heavy Arctic Fox.

I've seen as good as 12.5. But, mileage is what it is. I bought the Duramax dually specifically for camper hauling. It's a towing / hauling beast. I Can't believe that it's going to be 10 years old this fall.


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Old 03-10-2019, 12:51 PM   #34
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13-14 mpg with the below setup. The Bigfoot is Basecamp; the Jeep is used to run around the mountains with. 2004 Dodge/Cummins dually, 6 speed manual, free wheeling front hubs make a difference.
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Old 03-11-2019, 08:25 AM   #35
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13-14 mpg with the below setup. The Bigfoot is Basecamp; the Jeep is used to run around the mountains with. 2004 Dodge/Cummins dually, 6 speed manual, free wheeling front hubs make a difference.
Attachment 237529
Mighty nice equipment!
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Old 03-11-2019, 08:42 AM   #36
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sweet. just curious, what rear end ratio do you have, and what yr. bf?
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Old 03-11-2019, 09:41 AM   #37
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chassis mounted camper

Tiger chassis mounted coaches offer a little better areodymanics vs slidein units. My TigerCX coach is a '13, truck is a '12 Ram3500HD diesel(no DEF), 6 Spd. manual, 4x4 with 4.10 gears and manual hubs. Engine RPM's are about 2,100 at 65MPH. MPG's are between 13.5 and 14. Hammer down, 11's @ 80 MPH. Weight is 11,200 lbs. and is no mall cruiser. It has 48,000 trouble free miles to date.
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Old 03-11-2019, 10:44 AM   #38
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sweet. just curious, what rear end ratio do you have, and what yr. bf?
3.73. And the Bigfoot is a 1996 2500 model.
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Old 03-11-2019, 12:58 PM   #39
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nice, was 04 the first yr. if 3,73? j know for 02 you could either get 3,54 or 4,10.
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