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Old 12-01-2018, 04:51 PM   #1
Mini-Skoolie
 
Join Date: May 2018
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Year: 2001
Coachwork: Bluebird
Chassis: Freightliner
Engine: Cummings 6 cylinder diesel
Suping up my school bus

So on my checklist for my conversion, is doing some engine mods. On a 6 cylinder Cummins what would you guys recommend to increase fuel economy and or increase horsepower and performance. I've got a stock turbo on it right now is there a better one I should upgrade to? I've Been Told instead of upgrading the turbo to simply just Advance the timing. Has anyone else here tried this? Are there any negatives to doing this as in damaging the engine negatives? Are there any how to videos on doing this in a school bus? Thanks in advance.
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Old 12-01-2018, 05:07 PM   #2
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the FIRST thing you do if you are going to start power-adding is install a Pyro gauge as close to the manifold outlet or right before the turbo you can get..



a bigger turbo wont do you anjy good until you can add fuel.. the turbo simply puts more air in the cylinder... with more air you can burn more fuel. (which makes more power)..



advancing the timing can sometimes net more power depending on where the timing is now.. (I dont know the 5.9 24 valve spercifically).. it also can increase cylinder temp.. this why the pyro is important....


you can definitely have fun with poiwer adding!

-Christopher
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Old 12-01-2018, 06:30 PM   #3
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Location: Swansboro,NC
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Research and learn what you have?
If you do have the Cummings engine then there are many resources on the WWW that can help get more? Like caddiekid said. Find the HP rating of your specific engine and figure out if it can be turned up or not?
Turning an engine up out of its original design gets into how long it will last?
I can re-power what I have to go faster or just be happy with what I have? Run the back roads that I love anyway or interstate speed? Much rather stay out of the rat race at 70-80 mph and hit the backroad's at (49-50)? Might piss a few people off but it is still faster than a tractor or combine in the road
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Old 12-01-2018, 07:03 PM   #4
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I should also add dont forget your transmission .turnon up the torque can also destroy inadequate transmissions and break worn or weak U joints
Christopher
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Old 12-01-2018, 08:59 PM   #5
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I have a post on this a few weeks again. The industrial engine s are a lot harder to turn up if itís the 24 v. If itís 12 v then it s super easy
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Old 12-02-2018, 10:51 AM   #6
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Location: Houston, Texas
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Year: 1946
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Chassis: 1- 1/2 ton
Engine: Cummins 4BT
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The older "B" series engines are the easiest to tweak (4BT/6BT). Almost TOO easy. Cadillac is dead on. Don't go anywhere with it until you have an EGT telling you what is going on and definitely know the limits on the trans. Can't begin to count the number of folks who have cranked them up only to destroy them and or the trans. Easy to get carried away.



If you are running a "one wire motor" I do have some excellent tuning specs for that engine put together by one of the sharper minds over on "4BTSWAPS.COM".
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Old 12-02-2018, 11:31 AM   #7
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As much as I harp on purpose building your rig.. ie why do you need 600 horsepower to tow a Subaru in a short bus... as an old hotrodder I always go back to the fact that power-adding is just plain fun!IMG_4229.jpg

Christopher
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Old 12-02-2018, 05:08 PM   #8
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Year: 1991
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I had a 5.9 in a Dodge ram. last year of mechanical. Bruce at Pittsburgh Power said it was making over 400 hp. It only really had two mods, more fuel(easy with mechanical pump) and a different exhaust side of the turbo, no waste gate and smaller dia outlet. I put over 150,000 miles on it that way. Didn't have a pyro but, should have. I did have to replace a couple of exhaust manifolds. I regularly grossed over 27,000 lbs and averaged over 13 mpg. It would pull most mountains in 5th gear with the cruise on. I put 260,000 miles on it in 2 years, then bought a semi.
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Old 12-02-2018, 06:10 PM   #9
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that sounds like one mean arse 5.9.. what was it the guys on the dyno did last year? something like 1800 Horsepower before the block came apart? there was a cool youtube video floating around of the dyno run where that 5.9 block burst so fast that the crank was still spinning after the rest of the engine flew across the room..
thasts one strong engine to take even half that power..

-Christopher
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Old 12-03-2018, 06:36 AM   #10
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towing in 5th gear? 5th gear has broken so many times for me, and have a few teeth missing off the overdrive in the aux. as well. 5.9 is a great engine but tranny's do not like it.

Mine is a 96 with the N-4500, and three speed spicer aux that I added.
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