RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Powerstroke Engine Forum
Click Here to Login

Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-25-2019, 08:46 PM   #1
Junior Member
 
Join Date: Mar 2019
Posts: 10
1999 T444E, school bus version of the 7.3, Power Increase

I'm converting my 33` flat nose rear engine school bus.

To get to highway cruising of 60mph and 2000 RPM, I'm having my 5.11 rear end changed to a 4.10 (Allison dealer did the calculations).

To make up for some of the loss in gradabilty (pulling hills) I want to see what simple to moderate engine upgrades could be made to give me increased horsepower.

My engine is currently at 230hp, and the MT643 can easily handle 250hp.

Any suggestions are appreciated.

Here are the main differences between the engines:

Both engines feature the same basic specifications; the long blocks are identical between both engines. The 7.3L Power Stroke is a T444E save for the following differences:

The PCM's (Powertrain control module) are different, thus the different power ratings offered between the 2 engines. For example, the T444E was offered in ratings up to 620 lb-ft torque, where as the Power Stroke was only offered with peak torque reaching 525 lb-ft. However, you may also notice that the 275 HP rating of the Power Stroke is much higher than any HP rating of the T444E.

Accessory drive and various engine sensors

Turbocharger design

Water pump design

The T444E block is painted blue

T444E uses a mechanical fuel pump, requiring a different camshaft
__________________

Sforeaker is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 03-27-2019, 04:26 PM   #2
Senior Member
 
Join Date: Aug 2017
Location: DeLand, FL
Posts: 534
This site sees little activity about the Power stroke engine. Try this site. More activity.
https://www.ford-trucks.com/forums/forum167/
__________________

__________________
Rockwood 2604WS
Ford F250 Super Duty Diesel
Blue Ox Sway Pro
allenb12 is offline   Reply With Quote
Old 03-27-2019, 04:54 PM   #3
Senior Member
 
Join Date: Jun 2016
Posts: 210
Your gradability will stay the same, the transmission will be in a different gear. I would get rid of that 643 and put in a six speed Allison. Those 643 were never popular with the truckers because not enough gears and too big a jump between gears. Also if memory serves me right the 643 doesn't have locking convertor unless they have been changed since I quit selling HD Trucks.
__________________
Bill And Jeanne Anglin, Eagle River, Alaska.
1999 Dutch Star 3884, Freightliner, Cat 300, Jeep Liberty Toad.
nutcker is offline   Reply With Quote
Old 04-04-2019, 02:30 PM   #4
Member
 
Join Date: Apr 2018
Posts: 74
I am very familiar with the PSD. I suppose it comes down to what you want to sped. If that T444E has the same internals as the PSD (Rods mostly) then that is a great year, and has forged rods.


That being said, and beyond what has been mentioned, I would start with intake and tunes. I am sure someone provides tunes for that PCM, if not, DP Tuner, PHP, etc should be able to do custom tunes. Some of those guys will even go on a drive with you to tune to your driving style.


Beyond that, it starts getting expensive. Next would be higher flow injectors and an electric fuel pump. Tune required to utilize the capacity of the injectors. Since you have the manual fuel pump, you may have a regulated return with is good.


I am guessing the exhaust is restriction free, if not you may want to look into that.
__________________
2006 22' RVision Trail Cruiser Lite
No truck yet...
yowmemperor is offline   Reply With Quote
Old 04-10-2019, 12:34 PM   #5
Junior Member
 
Join Date: Mar 2019
Posts: 10
T444E vs PSD

Hi, and thanks for your input about the tuning. I'm waiting to get the rear end swapped out before I do anything. I want to see how it performs first.

I agree it's best to start simple and expand as necessary.

Per the T444E guts, it's my understanding most of the internals are exactly the same. There are a few externals, like the turbo and such that are different.

I think I'll change the key sensors and possibly add new injectors at the first sign of issues, but until then, waiting for the rear end to get done.

Any input you can provide about the difference in injectors, things to look for, and look out for, would be appreciated.

I know the oil system is a huge part of performance and I plan on checking all of that when I change out the oil. I'm pretty sure I'm going synthetic.

Steve
Sforeaker is offline   Reply With Quote
Old 04-11-2019, 11:31 AM   #6
Member
 
Join Date: Apr 2018
Posts: 74
I forgot about the HPOP (High Pressure Oil Pump), depending which one you have, after upgrading injectors, should you choose to do so, you may want an upgraded pump. It isnt required, and I think you can do stage 1 injectors just fine, stage 2+ may required an upgraded HPOP. It's been a few years since I've been in the scene.


I would head over to powerstroke.org and read up on injectors. There are places to avoid, and places for safe purchase. IIRC, whenever possible, buy new stage injectors. There is a lot of info over there on those. Im not sure what turbo currently sits in your bus, and what its limits are, just something to research.


You can also do tunes on stock parts, free up some performance as well. That would be a cheap one to try. You can always have it re-tuned, plus a 'stock' setting to get you rolling if you make changes and need to wait on new tune files.


So, you are on the right path starting where you are to see what it will do. What transmission does it have? You'll want to be absolutely sure to keep that fluid temp in check, its the death of the 4R100 and its relatives.



Cheap:
Intake
Exhaust
Fuel pump (depending on which you go with)
Tunes

Pricey:
Injectors
Turbo
HPOP
High flow fuel pump
Transmission upgrades
__________________

__________________
2006 22' RVision Trail Cruiser Lite
No truck yet...
yowmemperor is offline   Reply With Quote
Reply

Tags
1999, power



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ugly Betty :: 1999 Workhorse/Bluebird P32/School bus conversion Trilug iRV2 Owners Registry 0 06-26-2017 12:47 AM
Question new school vs old school G-Man562 Tiffin Owner's Forum 32 01-02-2016 01:38 PM
Guy buys old school bus Afubar Bus Conversions 1 12-16-2015 06:46 AM
School Bus Drivers License bdickson Just Conversation 12 11-11-2012 06:11 AM
School bus burned up due to brake failure BEBOP Workhorse and Chevrolet Chassis Motorhome Forum 19 05-28-2010 03:51 PM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:11 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.