Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Cummins Engines
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Thread Tools Search this Thread Display Modes
Old 03-14-2009, 08:18 PM   #1
Senior Member
Ken Gluckman's Avatar

Newmar Owners Club
Spartan Chassis
Join Date: Dec 2006
Posts: 216
Uprating ISM 450

I have been told that the only difference between the ISM 450 and ISM 500 is in the software and that a Cummins tech can easily uprate a 450 to 500 using just the computer.

Is this true? If so, is there any downside to doing this?

Ken Gluckman

2018 King Aire
Ken Gluckman 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 03-16-2009, 12:20 PM   #2
Senior Member
Join Date: Jul 2005
Location: Pahrump, NV
Posts: 329
Not sure about the upgrade but you should verify that you won't have more power than your trans can handle.

2011 Airstream Classic Limited
2011 GMC Sierra 2500HD Duramax/Allison
Techie is offline   Reply With Quote
Old 03-16-2009, 03:51 PM   #3
Senior Member
Join Date: Jan 2005
Location: Destin, Fl
Posts: 531
My understanding is that it's just a simple programming change. However, it's not cheap! I think it's because of the additional warranty exposure. You should have a 4000 series trans and it's good for 500hp.
2015 LADP, Destin, Fl
2010 Buick Enclave, SMI AFOne
racer0624 is offline   Reply With Quote

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
How to upgrade ISM 450 to 500 tm2go Newmar Owner's Forum 10 06-13-2017 12:08 AM
Cummins 500 HP ISM Engine Gene & Kaye Cummins Engines 10 09-13-2007 10:49 AM
ISM Cooling Package Works Excellent. Lug_Nut Newmar Owner's Forum 22 08-05-2007 05:10 AM
ISM Fan Belt Problem motorhomeguy Spartan Motorhome Chassis Forum 5 05-12-2007 05:36 PM
450 lbs. torque with 1/2 in t. wrench 20champ1 Workhorse and Chevrolet Chassis Motorhome Forum 14 11-26-2005 03:01 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:10 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.