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Old 03-31-2008, 11:59 PM   #31
Bus Nut
 
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Location: Savage, MN
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Re: more power from your diesel engine

What you say about more hp getting better fuel economy makes me think of something a owner of some buses in a nearby city.
This is a city where there are a few bus owners that operate for a school district.
The guy was telling me that most of them where ordering their buses with engine with higher hp even though it cost them more up front. and tis guy would also order highway gears so he could go faster. He also said the one guy would get the lower hp engine and he always had to cram his foot into the floor to keep up with the other guys on a charter trip and by doing so he had to fill up more often. So he learned eventually and started putting more money up front for more hp.
I would have bought a bus from they guy I was talking to but his were too new and I'm sure he sold them to the dealer for a good chunk of change when he got his new one. And they didn't have the lift door. I believe one of them was a TC but it wasn't his newer one which will do around 80mph.
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Old 10-12-2008, 06:30 PM   #32
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Re: more power from your diesel engine

Digging up this old thread, which should've been in the how-to section.
The link to the geocities site on the first page is the first one I did, then I moved it to freewebs so I could post pix with the articles.
And, another article, bumping up the timing:
http://www.thedieselgarage.com/forums/s ... php?t=6041
To explain the fuel usage a little better. It takes an engine a certain cc's to get to, say 210hp at 2500rpm. If you make more power at a lower rpm, you acually use a few less cc's of fuel. On a low power engine, the engine is winding up to max rpm and staying there longer before the next gear shifts. A big reason why a 500hp 15 liter truck engine can get 6 mpg. The biggest factors in a bus would be; hp level, timing, gearing(trans and rear end), and the fateful aerodynamics. I thought about making a new how-to article that had all this stuff in it, but I'll need to take more pix or a video to really bring it home.
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Old 10-02-2010, 09:40 PM   #33
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Re: more power from your diesel engine

I also made a few how-to videos. First the fuel rate, then the timing, and finally tightening the gov springs:


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Old 10-03-2010, 12:49 AM   #34
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Re: more power from your diesel engine

Quote:
I also made a few how-to videos. First the fuel rate, then the timing, and finally tightening the gov springs:



Thank you for for updates. I have a non after-cooled dt466, rated at 195hp. Whats the highest safe hp I can go by using these methods? I don't believe I have the room to install a after cooler. Also, what timing setting would I need for this. I'm looking for max power for hills and fuel economy for the flats. The transmission is a mt643. Thanks in advance.
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Old 10-03-2010, 11:28 AM   #35
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Re: more power from your diesel engine

Quote:
Originally Posted by kotflb
Thank you for for updates. I have a non after-cooled dt466, rated at 195hp. Whats the highest safe hp I can go by using these methods? I don't believe I have the room to install a after cooler. Also, what timing setting would I need for this. I'm looking for max power for hills and fuel economy for the flats. The transmission is a mt643. Thanks in advance.
You can go pretty far on the fuel screw, I'd say a good 6 full turns. New timing depends on the original timing, and how much more power you add. Some engines are 22* from the factory. I'll speculate yours is around 13-15* now. For the stock to mild combo, start with 17*. Maxed out fuel screw and tighter gov springs can go to 20*.
The 93-97s timing numbers are 17 for most all mods, and 19 if you tightened up the gov springs, but driving it hard can pop a headgasket. Same figues go for the Fords(6.6 & 7..
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Old 06-28-2011, 10:39 PM   #36
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Re: more power from your diesel engine

Does anyone know whether there is a the fuel pump can be turned up on the Detroit 8.2T?

I know that many of you hate the 8.2, but I am stuck with mine and would love to get a little bit more power out of it. Any ideas?


Graham
http://www.intrepidequipment.com Hauling handcycles in an an 83 Bluebird
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Old 06-28-2011, 10:47 PM   #37
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Re: more power from your diesel engine

No, the 8.2's dont have a fuel rate adjustment that an average Joe can do. They are done like the old 2 strokes. I suggest to be happy it runs good now.
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Old 06-29-2011, 04:34 PM   #38
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Re: more power from your diesel engine

Thanks! I will work on trying to be satisfied with the 8.2L

Graham
http://www.intrepidequipment.com Intrepid Handcycles
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Old 03-08-2015, 02:14 PM   #39
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I have an 8.2 and an at545 and can only do 49 mph.
The older men at the bus barn told me I could adjust the governor's to go faster but I would burn up the rear end and they day we got to pick the bus up I had to go to work and my wife had a friend to bring jolly roger home so I didn't get to ask what gear's to change to? I can't get any garage's around here to talk to me and the part's stores won't make suggestions? The interior is 90 % and the exterior is primed, holding tank's installed with only a few plumbing item's to finish and electrical is at an acceptable(working) point. I would just like to do more than 49? I used to be a mechanic and gave up on the computer mess. I have an 85 8.2 non turbo and don't know where to begin adjusting for more speed and I can't get anyone to tell me what gear's I need to change to in my eaton rear end ?
I have a garage that will do it but I have to bring the hog head to them not the whole rear end? If I have to do all of that in a gravel drive way I know enough to mesh the gear's myself. I can't get enough info about my set up to figure out what gears to buy?
8.2 with at545 and eaton rear model 16s
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Old 03-08-2015, 07:48 PM   #40
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first you need to know what rear end ratio you have already, and you might want to check and see if your tranny is even shifting into forth gear, 49 sounds like maxed out in third
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