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Old 03-01-2007, 10:21 AM   #1
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Power. I want more power!

I have an 1989 BBAA with an 8.3 Cummins. Does anyone know how the governor works? Has anyone gotten more power without breaking the bank? I was thinking intercooler (or aftercooler as the mechanic calls it), adjusting the injection pump and maybe a larger turbo. Have any of these things been tried by anyone here? The power is ok on the flats, but when I hit a long grade, forgetaboutit. Any feedback would be appreciated.
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Old 03-01-2007, 12:11 PM   #2
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I need more power Scotty!!!!!

bigger bank account, older whisky, younger women, MORE POWER!!! get in line pilgrim we all want that. Money=HP! sportyrick
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Old 03-01-2007, 12:22 PM   #3
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This site has good instructions for just about any enginewe'll ever see in our buses. What horsepower rating do you have on the engine? It is possible that you have the lower spec engine. I find it amazing that the manufacturers can charge SO MUCH for the power upgrades on a particular engine when the only real difference is in the injection pump, but I'm sure they need to spec heavier transmissions, pay various taxes, etc. On top of that, they're in business to make money.

It's important to remember that a bus will never be a sports car. It will never be a heavily loaded modern pickup even. Longevity, reliability, and safety are of the utmost importance in a bus. A given engine only has so many horsepower hours in in. You can safely add more power to just about any engine, but the truth remains that it WILL reduce the life of that engine. Compare a 116 hp 22re Toyota 4 cylinder than can easily got to 200,000+ miles to an 8000+ hp nitromethane top fuel drag engine that gets torn apart after every 1/4 mile pass.

Obviously you aren't going to see something that drastic, but keep everything else in mind. Your engine, transmission, driveshafts, axle, etc are all a matched system. It's tough to really upgrade one item without upgrading the others. You are lucky in that I don't think I've ever sen an 8.3 Cummins with an AT545. They all have MT643 transmission. Given the rating of that transmission versus the relatively small size of a school bus, I think you have some breathing room. I think you might be able to iincrease your power as much as 50 hp without too much trouble. Again, a lot depends on what your stock rating is. Go in small increments and keep an eye on other parts. I plan to up my power a little once Old Man Winter lets up mostly just to prevent downshifting. My top speed is limited to about 45 in 3rd gear, but 4th gear doesn't always have the power for hills.
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Old 03-01-2007, 04:48 PM   #4
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That's why I think this forum is awesome. All you have to do is ask and you get answers. The plate on the engine says 240 hp. I would like to get it around 300. That website you listed doesn't have an 8.3 Cummins on the list. Maybe I missed it. If anyone has done anything to your motor, I would like to hear from you. Thanks.
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Old 03-01-2007, 05:07 PM   #5
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The 8.3 is listed as the 6CT in that list. It has the same instructions as the 3.3L and 3.9L 4BT's and 5.9L 6BT's. If it turns out that you have one of the inline pumps, the instructions are the same as a DT360, DT466, Ford Brazilians, etc.
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Old 03-02-2007, 09:10 AM   #6
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Quote:
Originally Posted by crazycal
That's why I think this forum is awesome. All you have to do is ask and you get answers. The plate on the engine says 240 hp. I would like to get it around 300. That website you listed doesn't have an 8.3 Cummins on the list. Maybe I missed it. If anyone has done anything to your motor, I would like to hear from you. Thanks.
i'd kill a man for a bus with 240 hp!

ok...i woulnd't really kill....seriously maime perhaps!
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Old 03-02-2007, 04:26 PM   #7
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it's very simple/cheap (as in free) to get that out of a 5.9 cummins with some pump tweaks.

spend a little money and you can get alot more. of course, the transmissions won't like it.
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Old 03-03-2007, 09:11 AM   #8
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Quote:
Originally Posted by lapeer20m
i'd kill a man for a bus with 240 hp!

ok...i woulnd't really kill....seriously maime perhaps!
I guess I better hide!

DD 6V92TA - 350HP
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Old 03-03-2007, 03:52 PM   #9
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where'd you say you live, busnut? lapeer wants to know.

I wouldn't kill either for 240, hp., well, my boss maybe. I'd push him in front of a 240 hp bus for pocket change.

but three fity? I'd kill my gramma, well, she's quite dead actually, both of them. I would kill a number of inlaws and maybe even close blood relatives for that kinda juice in a skoolie.

Is there anybody here that lays claim to the fastest skoolie around? Gotta be somebody out there with a hopped up, propane breathing 800hp shortie that will give mustangs a run for their money? Or do folks with that kinda dough not associate with this gang of misfits?
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Old 03-03-2007, 09:01 PM   #10
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By rough estimation from a drag calculator, a 15,000 lbs bus (that's pretty hefty for a drag prepped bus) with 1000 horsepower will run the quarter in 14.336 seconds@94.882 mph. That's pretty darn quick and 1000 horsepower is not out of the realm of possibility for a twin charged 6V92 or 8V92, both of which could be made to fit in a conventional with some work.

My life's goal is to set the landspeed record for a vehicle fueled by WVO, but it probably wouldn't be a bus. Something like Gale Banks' Sidewinder with external pre run heating perhaps
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