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Old 01-16-2009, 02:16 PM   #1
Mini-Skoolie
 
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Maximizing MPG with a DT360

Hi,

I just recently purchased a 35' International with a DT 360 and an automatic transmission; I'm trying to figure out the best things to do to maximize my mpg. The thing seems pretty underpowered and struggles to do 20 sometimes going up hill. I'm not sure if this is normal, or just the weak 360 (not sure, but I think one of my brakes might be seized up, too). I've seen threads where people talk about getting more hp out of the 360 by adding an intercooler, turning up the fuel screw, or adjusting the governor. I don't particularly need more power for the sake of power, but I would like to maximize my mileage and am wondering what adjustments I should make in order to do this. The bus will primarily be used for relatively unloaded few-day camping trips traveling around 140 miles each way. This has to drive over a mountain range, though. Also, once a year the bus will travel to Burning Man while carrying a load. some 600 gallons of water(about 5000lbs) and we'd probably pull a full trailer full of stuff (food, steel structure material, etc)

Any advice would be appreciated, or thoughts on what kind of mileage I should expect,
Thanks.
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Old 01-16-2009, 04:12 PM   #2
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Re: Maximizing MPG with a DT360

Hi-

I have a 30' bus with a DT360 and AT545 auto transmission, and I get 8mpg on average. Yes it is gutless on the hills or with a headwind, so the performance you are experiencing is probably normal. I think you can change the gearing (for increased highway speeds) without a loss in MPG, but changes to the engine or fuel delivery will cost you MPG. But I could be wrong.

HTH
Sean
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Old 01-16-2009, 06:44 PM   #3
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Re: Maximizing MPG with a DT360

turning up the pump, fuel screw and governor won't hurt your mileage unless you use it all the time, it might even help your mileage if it helps you get the engine to run in its "sweet spot", it's also nice to have a little extra to be able to take a run at a long hill.
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Old 01-20-2009, 12:57 PM   #4
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Re: Maximizing MPG with a DT360

I just bought a bus with the DT360; same performance as what you described. Anyone got a link to a write up on how to turn up the pump? I have done it on my 3/4 ton dodge 12-valve, so I am somewhat familliar, but am not familiar with the DT360.
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Old 01-20-2009, 01:53 PM   #5
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Re: Maximizing MPG with a DT360

do a search on this site, their has been some detailed discussion in the past.
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Old 01-20-2009, 06:01 PM   #6
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Re: Maximizing MPG with a DT360

I had a 35ft DT360 dog nose that did most of it's miles going over the Appalachian Mountains. Reliable, but also could be relied upon to be the slowest thing on the road Some of the time it was towing a trailer, sometimes not.

If I kept it in the sweet spot at around 55, I got about 9mpg. Bump it up to 60-65 and I got 5mpg. Hills are not it's friend, but you'll always get up 'em. Just add some time to the trip.
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Old 01-20-2009, 10:20 PM   #7
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Re: Maximizing MPG with a DT360

I had a dt360. I drove it from michigan to nevada and back 3 times, and i turned up my hp (fuel screw) and my rpm's (govenor)

turning up the hp actually increased my mileage slightly....i don't understand why. This was tested both locally, and on a long distance 5K mile trip.

these are the best mod's i ever made to my bus.....ok, the jacuzzi was actually the best mod....but engine "performance" is definately a bonus.

easy to do, if the weather is not -40F (or -40C...c and f are = at -40) where you live.

here is the link:

http://www.skoolie.net/forum/viewtop...l+engine#p3142
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Old 01-21-2009, 06:00 PM   #8
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Re: Maximizing MPG with a DT360

Thanks Lapeer. exactly what I was looking for.
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Old 01-22-2009, 06:08 PM   #9
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Re: Maximizing MPG with a DT360

Leeper: I've been considering the jacuzzi mod myself. How did you go about doing it? just get a fiberglass shell and get 12v pumps and heaters? heat exchanger off the engine? How do you keep the water warm when the bus is turned off?
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Old 01-23-2009, 01:27 PM   #10
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Re: Maximizing MPG with a DT360

Quote:
Originally Posted by icnivad
Leeper: I've been considering the jacuzzi mod myself. How did you go about doing it? just get a fiberglass shell and get 12v pumps and heaters? heat exchanger off the engine? How do you keep the water warm when the bus is turned off?

kinda hijacking the op thread....

anyhow...

i find a used jacuzzi for free or cheap, then either remove the wall (not so good) or the roof/ceiling (much better) and install the jacuzzi after leak testing it. Then i convert the pumps to small 110 volt clear water pumps from northern tool, like this one:



I use a plate heat exchanger to heat the water utilizing engine coolant:



in one bus a small residential fuel oil boiler to heat water when parked.

if you put a cover on the jacuzzi, you can heat 400 gallons of water in under an hour of driving utilizing engine heat. In the summer you don't even need a cover.

craigslist is a good place to find used jacuzzi's. They are pretty easy to fix if they are broken...they are mostly made of standard pvc pipe, if not, you can use a "fernco" fitting



to adapt to standard pvc size. Since you are removing the pump and control board it makes it easy to find a cheap broken jacuzzi.

and you can buy a cheap temperature controller off of ebay so you can control the temp of the jacuzzi.

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