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Old 08-30-2019, 08:17 AM   #1
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Top speed, suggested long term RPM...

So I just bought a 1997 International 3800 53 passenger bus. It has the T444E 210HP Navistar Automatic with a Spicer F155S 4.33 rear end. The bus barn director told me its governed to 65MPH. Does anyone know if this is electronically limited, or RPM limited? If its electronically limited how do I remove it? Id like it to be able to cruise at 75MPH and NOT at redline. If its limited by gear ratio then whats a website where I can buy a better ring and pinion.
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Old 08-30-2019, 09:26 AM   #2
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So I just bought a 1997 International 3800 53 passenger bus. It has the T444E 210HP Navistar Automatic with a Spicer F155S 4.33 rear end. The bus barn director told me its governed to 65MPH. Does anyone know if this is electronically limited, or RPM limited? If its electronically limited how do I remove it? Id like it to be able to cruise at 75MPH and NOT at redline. If its limited by gear ratio then whats a website where I can buy a better ring and pinion.
WHat's your rpm at 65?
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Old 08-30-2019, 09:31 AM   #3
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The T444E has both an rpm limiter and a max speed limiter. Both are electronic and can be reprogrammed. You didn't mention your transmission but if we take for granted it's an AT545 your top speed should be a bit higher, Taking a few things for granted, likely 72-75mph at redline.
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Old 08-30-2019, 09:48 AM   #4
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The T444E has both an rpm limiter and a max speed limiter. Both are electronic and can be reprogrammed. You didn't mention your transmission but if we take for granted it's an AT545 your top speed should be a bit higher, Taking a few things for granted, likely 72-75mph at redline.
I could only get 62 out of my 466/643/.444 rear combo.
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Old 08-30-2019, 09:55 AM   #5
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Im picking up the bus on Tuesday, VIN is 1HVBBABM0VH519688 if anyone knows how to look up the tranny. Im looking at preferably 2k RPM at 75MPH.
Im planning on getting this too.
International CE powered by Navistar 7.3L T444E Common Rail - Diesel MAGNUM EVO-Tech Heavy Duty Performance Chip.

I don't want to have to be bouncing off the rev limiter for 5 hours.
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Old 08-30-2019, 10:08 AM   #6
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Ask the seller what transmission it has, or call international with the VIN.

Your dream of 2k at 75mph is pretty funny. That's more likely your rpm at 45.
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Old 08-30-2019, 10:09 AM   #7
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I could only get 62 out of my 466/643/.444 rear combo.
T444E likely spins a bit faster so you can get a couple extra mph. Mine was limited to 2600.
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Old 08-30-2019, 10:18 AM   #8
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Is it not bad on these engines to sit at 2600 rpm for 5 hours straight over and over?
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Old 08-30-2019, 10:24 AM   #9
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Quote:
Originally Posted by Necro View Post
Im picking up the bus on Tuesday, VIN is 1HVBBABM0VH519688 if anyone knows how to look up the tranny. Im looking at preferably 2k RPM at 75MPH.
Im planning on getting this too.
International CE powered by Navistar 7.3L T444E Common Rail - Diesel MAGNUM EVO-Tech Heavy Duty Performance Chip.

I don't want to have to be bouncing off the rev limiter for 5 hours.
Ive got 190hp, a 545, and .342 gearing in a 5 window shorty. Mine will do 65 at 1750. Not sure about the rpm's at 2400 which is my redline. Bus will do 80+.
Performance chips won't help you lower your rpm. Not at all.
You're going to need the highest (numerically lowest) gearing you can buy to try and get 75 at 2k.
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Old 08-30-2019, 10:25 AM   #10
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it's certainly not great for them. Generally speaking, slow down and give yourself some breathing room. There are some buses with unlocked 6 speed transmissions that can go a bit faster than the much more common 4 speed units and I am taking a few things for granted that you didn't specify (transmission type, tire size) but if it's a typical model you're gonna be living life around 60.
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