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Old 02-19-2019, 01:18 PM   #1
Mini-Skoolie
 
Join Date: Sep 2018
Location: Richmond, VA
Posts: 10
Year: 2000
Engine: Cummins ISB-190-BUS ENCORE / ISB CM550
Speed Limiter / Governor Safe Tweaks

Greetings -

Here's another one of those questions. I've tried using the search feature, but honestly got a little lost in translation. My bus specs are below, and the bus is currently limited to 52MPH. I believe its speed limited because the second you hit 52, you can hear the engine rev down substantially.

We are going to be using this bus mostly on highways where the speed limit is set to 70-75 and would like to go a bit faster then 52. Given the vast knowledge of the members on this form, what would be safe speed to limit the governor to given the information below?


Model:2000 Bluebird TC FE 3700
Build Date: 08/16/1999
Engine: Cummins ISB-190-BUS ENCORE / ISB CM550
HP: 190 @ 2600RPM
Idle: 800 RPM
Trans: Alyson AT545
Rear: 4.44
Tires: 40.5"

I appreciate all the help in advance.
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Old 02-19-2019, 01:56 PM   #2
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Join Date: Apr 2013
Location: Colorado
Posts: 1,597
Year: 1993
Coachwork: bluebird
Engine: 5.9 Cummins, Allison AT1545
Rated Cap: 2
whats your rpm at 52?

it could be your fuel pump, your transmission, or somewhere else.

i see its a '99. i don't know anything about ecm
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Old 02-19-2019, 02:08 PM   #3
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Join Date: May 2014
Location: West Ohio
Posts: 1,128
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
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Old 02-19-2019, 02:21 PM   #4
Mini-Skoolie
 
Join Date: Sep 2018
Location: Richmond, VA
Posts: 10
Year: 2000
Engine: Cummins ISB-190-BUS ENCORE / ISB CM550
Quote:
Originally Posted by turf View Post
whats your rpm at 52?

it could be your fuel pump, your transmission, or somewhere else.

i see its a '99. i don't know anything about ecm
Its a 2000, built in late 99. Not 100% sure of the RPM's at 52, I'll have to get my driver out to go check. Havent gotten my CDL yet.
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Old 02-19-2019, 02:29 PM   #5
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Join Date: Dec 2018
Location: Rock Hill, SC
Posts: 251
Year: 1997
Coachwork: International
Chassis: Vista 3600
Engine: DT466E / AT545
Rated Cap: 72
Quote:
Originally Posted by rabryant1 View Post
Its a 2000, built in late 99. Not 100% sure of the RPM's at 52, I'll have to get my driver out to go check. Havent gotten my CDL yet.
Once you take enough seats out so it cannot sit more than 16 people, you don't need a CDL. And being honest, most of us drove our buses home (some thousands of miles) without removing the seats and without a CDL.
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Old 02-19-2019, 02:36 PM   #6
Mini-Skoolie
 
Join Date: Sep 2018
Location: Richmond, VA
Posts: 10
Year: 2000
Engine: Cummins ISB-190-BUS ENCORE / ISB CM550
Quote:
Originally Posted by geminusprime View Post
Once you take enough seats out so it cannot sit more than 16 people, you don't need a CDL. And being honest, most of us drove our buses home (some thousands of miles) without removing the seats and without a CDL.
So still government-owned bus being operated by government employee. County policy requires us to have one even if it's not used to transport passengers anymore. I get looks whenever I just go start it to check something.

Check my thread in new members if your currious about our plans.
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Old 02-19-2019, 03:47 PM   #7
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Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 7,187
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
I'd start looking for a transmission upgrade if you plan on going faster with that AT545.
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Old 02-19-2019, 03:59 PM   #8
Bus Crazy
 
Join Date: May 2014
Location: West Ohio
Posts: 1,128
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
With your specs you can theoretically hit 70 mph at 2600 rpm. Real world you'll probably get to 65 running wide open.

The video I linked shows how to remove the limiter. Any other questions ask away.
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Old 05-13-2019, 01:16 PM   #9
Mini-Skoolie
 
Join Date: Sep 2018
Location: Richmond, VA
Posts: 10
Year: 2000
Engine: Cummins ISB-190-BUS ENCORE / ISB CM550
Quote:
Originally Posted by Booyah45828 View Post
With your specs you can theoretically hit 70 mph at 2600 rpm. Real world you'll probably get to 65 running wide open.

The video I linked shows how to remove the limiter. Any other questions ask away.
So - Here is an interesting question. Our bus wont exceed ~1500 RPM's. Pedal down, all the way to 52 where it wont go any faster. Never exceeds 1500 RPM's.

Any ideas on that one?
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Old 05-13-2019, 01:50 PM   #10
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Join Date: May 2009
Location: Columbus Ohio
Posts: 11,656
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
what kind of engine? what year? sounds like it could be a speed limiter? or maybe there's a fuel issue where the engine wont rev higher?
need to more about what it is..
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