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01-13-2019, 01:09 AM
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#1
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New Member
Join Date: Jan 2019
Location: North Atlanta 'Burbs
Posts: 1
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Governor? -2000 Int AmTran
Hi all...just picked up our 2000 Int AmTran and this is the first of what I assure you will be a long list of (potentially) stupid questions.
On the highway on the 500 mile drive home, my new (to me) girl would only do 70 MPH exactly. There was one place where I crested a hill at 70...it was down hill for a couple miles, but she wouldn't do 71. I'm guessing that means there's a governor on her...but I'm so new to this I have no idea where to look or if it's even worth the time given that 70MPH in a skoolie seems to be a pretty good highway speed. Thoughts?
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01-13-2019, 06:30 AM
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#2
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Bus Geek
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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Quote:
Originally Posted by Crockett
Hi all...just picked up our 2000 Int AmTran and this is the first of what I assure you will be a long list of (potentially) stupid questions.
On the highway on the 500 mile drive home, my new (to me) girl would only do 70 MPH exactly. There was one place where I crested a hill at 70...it was down hill for a couple miles, but she wouldn't do 71. I'm guessing that means there's a governor on her...but I'm so new to this I have no idea where to look or if it's even worth the time given that 70MPH in a skoolie seems to be a pretty good highway speed. Thoughts?
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Be glad it even goes that fast.
Its electronically limited or limited by gearing.
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01-13-2019, 06:38 AM
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#3
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Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,760
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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65-70 is really all you want to do in a skoolie... for one the wind resistance will make your drivetrain work hard, plus will really lower your MPG's.. there are various threads here about driving at different speeds.. your MPG's will greatly increase by running 60-65 vs 70-75.
the fact it goes 70 with ease even on hills sounds like you got yourself a nice bus!!
but Yes unless you have run out of RPMs.. (most Navistar engines max at 2600-2700 RPM redline).. then the speed limiter is in the computer and can be turned off with a scan tool. if youy are hitting 70 MPH at the above RPM, then youy are running it as fast as its capable of.
-Christopher
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01-21-2019, 02:21 PM
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#4
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Skoolie
Join Date: Feb 2018
Location: Stansbury Park, Utah
Posts: 189
Year: 2000
Coachwork: Amtran
Chassis: GA39530
Engine: DT466E 215hp 620tq
Rated Cap: 40
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Tire Limitations
Remember tires are only rated for 75mph, you go over that and who knows what might happen to them. Kaboom!!!!!!!
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01-21-2019, 02:44 PM
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#5
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Bus Geek
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,482
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
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I'm trying to research the answer to how much faster over the speed rating can a tire safely handle. Some of the guys make it sound like if you exceed your tire rating by 10mph it's going to blow up and kill you. Mine are rated at 75mph and I've run stretches of 300miles at 85 with I'm sure, no detriment to the tires. Most things I have found that need a safety rating are manufacturer with almost a 50% margin to keep liability down. Personally I think a 75mph rated tire will do 100 all day long if they are in good condition.
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01-21-2019, 02:58 PM
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#6
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Bus Geek
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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Quote:
Originally Posted by FamilyCircus
Remember tires are only rated for 75mph, you go over that and who knows what might happen to them. Kaboom!!!!!!!
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A good number of the tires made now are rated for 80mph and are good for more mph if inflated properly.
Plenty of school buses can go 80 even 85 in stock school-duty form. Check YouTube.
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01-21-2019, 03:12 PM
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#7
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Bus Geek
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,482
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
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Quote:
Originally Posted by EastCoastCB
A good number of the tires made now are rated for 80mph and are good for more mph if inflated properly.
Plenty of school buses can go 80 even 85 in stock school-duty form. Check YouTube.
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I ran a full tank out (350miles) at 85mph, on cruise control. DT466/3060, 5 sp.
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01-21-2019, 03:40 PM
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#8
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Bus Geek
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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That's what I'm talking about! heck yeah!
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01-21-2019, 03:41 PM
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#9
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Skoolie
Join Date: Feb 2018
Location: Stansbury Park, Utah
Posts: 189
Year: 2000
Coachwork: Amtran
Chassis: GA39530
Engine: DT466E 215hp 620tq
Rated Cap: 40
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Rear End Ratio
o1marc
Whats your rear end ratio?
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01-21-2019, 03:51 PM
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#10
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Bus Geek
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,482
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
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Quote:
Originally Posted by FamilyCircus
o1marc
Whats your rear end ratio?
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Forget exactly, but it's a mid/low 4. gear.
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01-21-2019, 03:57 PM
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#11
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Skoolie
Join Date: Feb 2018
Location: Stansbury Park, Utah
Posts: 189
Year: 2000
Coachwork: Amtran
Chassis: GA39530
Engine: DT466E 215hp 620tq
Rated Cap: 40
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Probably 4.44, its a very common ratio. Maybe 4.10 but less likely.
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01-24-2019, 11:34 PM
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#12
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Bus Nut
Join Date: Feb 2018
Location: Pendleton Indiana
Posts: 348
Year: 2010
Coachwork: IC
Engine: MF DT466
Rated Cap: 81
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Before going much faster I would give the brakes a good looking over to be safe.
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07-23-2019, 05:26 PM
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#13
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Bus Nut
Join Date: Jul 2019
Location: Johnson City TN
Posts: 441
Year: 2004
Coachwork: IC/AMTRANS RE
Engine: T444E 7.3 w/ MD3060
Rated Cap: 36000lbs / 78pass / 39'
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Mine is a 04 IC rear engine T444E mated to a Allison MD3060 engine is limited to 2500RPM and just 55MPh.
On the MD3060 transmissions they are really a 6 speed, most are locked out to only 5.
I'm working on trying to get mine approved to be reprogrammed the proper way but if that doesn't work I will find a 3rd party option to get the 6th gear unlocked. Glad the seller of the bus I have didn't realize that it didn't have that wimpy AT545 trans in it otherwise I'd paid more for it LOL.
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