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Old 04-24-2012, 02:41 PM   #1
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5.9 Cummins governed out @65?

i got to drive my bus this weekend cause we finally got plates for it. 2 questions for any who dare answer:

1. i got the bus (it has yet to be named) cruising down a hill and after chugging up the other side of the hill @ 35 i wanted to get some momentum to get up the next one. when i hit 65 going down hill it seemed to govern out. the RPM's just went to idle with the accelerator pedal pushed down. what gives? can i adjust this to say 80mph? i assume its because its a school bus... its not like i was red lining it...maybe 2600RPM's?

2. the bus's title says "bus" as vehicle type. therefore the registration (in Pa) says vehicle type "bus" and "seats: 17" we took out seats and we have 4 school bus seats in it with 2 seatbelts each and a drivers seat thats 9 seatbelts. we also have a couch in there thats 3 seats. so depending on how you look at it its either 9 or 12 seats. i know you need a CDL to drive a vehicle designed to haul 16 or more passengers in pa. my goal is to get it titled as an RV to avoid all the questions and i know what to do to get there, but we already have a few hundred bucks into tags and state regulated B.S so im tempted to just run the bus tags for a year and get my money out of them then do the title change... what should i do? do buses have special inspection requirements?(we have one seat turned backwards)

advice please?
THANKS!!!

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Old 04-24-2012, 06:26 PM   #2
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Re: 5.9 Cummins governed out @65?

5.9 Cummings is only designed for 2500 rpm. if you want more speed change Diff ratio. remember changing ratio affects Power and torque
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Old 04-24-2012, 09:43 PM   #3
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Re: 5.9 Cummins governed out @65?

I hate not being able to go 80 You might ask the motor vehicle dept if they would refund some of your fees as the bus will be used as motor home or whatever. This would work here in Ca where I learned that if you junk your vehicle and the fees are current you can apply for a refund of the unused portion of the fees. I had the opportunity to do this several times when the folks who rented cars from me smashed them beyond repair.

If Pa will do this like Ca you would save money on the plates to say nothing of the savings on insurance. As always when dealing with the government know what you want going in and take as much documentation along as you can. Good luck!
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Old 08-06-2012, 05:53 PM   #4
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Re: 5.9 Cummins governed out @65?

If it is an '89 to '93 cummins (with Bosch VE rotary IP) there is a governer spring you can replace to raise the RPM's just did mine but haven't drivin it yet. Its called the 3200 spring for the cummins, look it up plenty of stuff out there on it.
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Old 08-06-2012, 06:05 PM   #5
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Re: 5.9 Cummins governed out @65?

you need to change the rear axle ratio to go faster.
There are things you can do to the injector pump for more power, but you do not want to increase your rpms. The diesel engine forums have many posts about power increases. Increasing the rpm's like 1000 will not make the engine very happy...
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Old 08-07-2012, 03:36 PM   #6
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Re: 5.9 Cummins governed out @65?

without a tach, it is dangerous to turn the govenor up, but depending on year you can turn up the rpm's and the hp for free by just turning some screws.

You can get 5-10 mph more out of it.

You're best bet would be to change out the rear end gears. A lock up torque converter and 4.10 rear end gears you can do 75 mph and get 6-8 mpg.

or you can drive 60 mph with the same setup and get 12 mpg!
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Old 08-07-2012, 05:03 PM   #7
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Re: 5.9 Cummins governed out @65?

feel lucky that u get that out of her ,, my 5.9 160 hp with a 12 vale is grov at 58.when running down hill ,55 is top for mine,i got the 545 trans with a 478 rear as most of the bus are..mine is a 94 tc2000 with only 37,000 miles on her,
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Old 08-07-2012, 05:16 PM   #8
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Re: 5.9 Cummins governed out @65?

Ha browncrown & atcc 77

just got back from a 1,500 round trip,that old bird flew with air under her wings... not bad for a 94 bird that been sitting in storge for two yrs.waiting on me to get her done with the conversion. 37,000 miles, ture ,heck she not even broke in yet,,,next trip is montana..
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Old 08-07-2012, 05:20 PM   #9
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Re: 5.9 Cummins governed out @65?

Don't it feel good to get them out on the road Keith
313,500 miles on my odo and, KNOCK ON WOOD, still going strong too
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Old 08-07-2012, 05:39 PM   #10
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Re: 5.9 Cummins governed out @65?

Quote:
Originally Posted by keith
Ha browncrown & atcc 77

next trip is montana..
Well, stop by....
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Old 08-07-2012, 06:34 PM   #11
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Re: 5.9 Cummins governed out @65?

u know i was worry the hole trip,but ran flaw less, 10 mpg ,in the mtns and 13 mpg on the flat, ,, i toke the muffer off and ran a stright pipe.. next we going to put a cold air box , and a jake break...
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Old 08-10-2012, 09:33 AM   #12
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Re: 5.9 Cummins governed out @65?

Thanks for all the replies guys, ive been busy workin on it alot since i got it out here to ohio. I was pretty nervous about the ride out to oh from pa cause it was one of the hottest days of the year but the 99 tc1000 did great rt 80 where i was driving has lots of long uphill grades and i worried about bogging down to 35mph and over heating but no such trouble! i was passing big rigs chugging about 60 goin up those mile long grades ME HAPPY. im not concerned about gettin more speed out of her any more, it actually governs out at like 67, will hit 72 goin down hill. no need to worry about a speeding ticket.

pictures to come soon!!
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Old 08-10-2012, 09:40 AM   #13
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Re: 5.9 Cummins governed out @65?

Quote:
Originally Posted by keith
u know i was worry the hole trip,but ran flaw less, 10 mpg ,in the mtns and 13 mpg on the flat, ,, i toke the muffer off and ran a stright pipe.. next we going to put a cold air box , and a jake break...

What does it sound like with the straight pipe? Can you put a video up? I was thinking about doing that also if it wasn't too loud.
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Old 08-10-2012, 10:11 PM   #14
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Re: 5.9 Cummins governed out @65?

sound like a big rig with a425 cat.no loud at all nice melow sound,,,,take it off at the muffer an run the pip back to in fornt of the rear wheel and face it out,
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Old 08-11-2012, 08:31 PM   #15
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Re: 5.9 Cummins governed out @65?

i was thinking about straight piping my exhaust, what are the advantages? i too was afraid it would be louder? mine would be easy to cut off b4 the muffler and pipe out the side...
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Old 08-11-2012, 09:10 PM   #16
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Re: 5.9 Cummins governed out @65?

more hp and u need to run it out in fornt of the rear tire,elbowing it down to face the ground..
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Old 08-12-2012, 03:04 AM   #17
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Re: 5.9 Cummins governed out @65?

What happens if it is run all the way back?
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Old 08-12-2012, 08:22 AM   #18
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Re: 5.9 Cummins governed out @65?

that will be ok too, i did mine like that because i wanted to use the space where the tail pipe ran,,,,
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Old 08-13-2012, 10:17 AM   #19
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Re: 5.9 Cummins governed out @65?

Diesels breath better without the muffler or cat converter
i need to punch our or remove the muffler on my cat engine.
Have already removed the cat converter on my diesel pickup... muffler will be next.
Tuning up the diesel engines for higher hp and removing restrictions in the exhaust is good for the engines and gets you better fuel mileage if you drive sensibly...
Just what i have learned over the years.

However, not much i have ever done on a 8v71 or 8v92 has ever helped much with my 2 coach busses... (6-8mpg)
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Old 08-19-2012, 09:32 AM   #20
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Re: 5.9 Cummins governed out @65?

Quote:
Originally Posted by BuffaloStampede81
i got to drive my bus this weekend cause we finally got plates for it. 2 questions for any who dare answer:

1. i got the bus (it has yet to be named) cruising down a hill and after chugging up the other side of the hill @ 35 i wanted to get some momentum to get up the next one. when i hit 65 going down hill it seemed to govern out. the RPM's just went to idle with the accelerator pedal pushed down. what gives? can i adjust this to say 80mph? i assume its because its a school bus... its not like i was red lining it...maybe 2600RPM's?
2600 for a 5.9 ISB in a Bird is about right, actually. Assuming you have 265/70R19.5 tires, I'm guessing you have 3.54 gears. If so, that is as tall as they get. My friend has a 1998.5 TC1000, he has the same setup...it will run 65MPH (~2300RPM, IIRC) all day.
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