Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Spartan Motorhome Chassis Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 10-08-2021, 07:38 PM   #1
Senior Member
 
Ohio44718's Avatar
 
Entegra Owners Club
Spartan Chassis
Join Date: Feb 2016
Location: Canton, Ohio
Posts: 269
Reprogramming Engine Brake - K3 Chassis or am I doing something wrong?

Anyone had their exhaust brake and transmission programming changed on the K3 ISX chassis? The standard programming is to activate the engine brake and downshift the transmission when you take your foot off of the accelerator. On my ISC, I had it changed so the engine brake would not kick in until I touched the brake pedal. That allowed me to coast at times and get some free mileage. What I have noticed, even if I turn the exhaust brake off, the transmission downshifts and my RPMs jump up to 2200 to 2300 rpm. I would think that is somewhat hard on the motor plus it obviously starts slowing you down. Or am I doing something wrong?
Ohio44718 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 10-09-2021, 05:02 AM   #2
Senior Member
 
Ohio44718's Avatar
 
Entegra Owners Club
Spartan Chassis
Join Date: Feb 2016
Location: Canton, Ohio
Posts: 269
When I make the statement reprogramming, this just means changing options within the ECM not actually making changes to the code.
Ohio44718 is offline   Reply With Quote
Old 10-09-2021, 06:21 AM   #3
Senior Member
 
Join Date: Sep 2015
Posts: 827
following, would like this option on mine.

how are you making the option change
ransil is offline   Reply With Quote
Old 10-09-2021, 06:26 AM   #4
Junior Member
 
tdrees's Avatar
 
Join Date: Jan 2006
Posts: 10
I believe thatís something an Allison shop does. Reprogram the Allison ecu so it will downshift to different gear.
tdrees is offline   Reply With Quote
Old 10-09-2021, 07:14 AM   #5
Senior Member
 
Ohio44718's Avatar
 
Entegra Owners Club
Spartan Chassis
Join Date: Feb 2016
Location: Canton, Ohio
Posts: 269
Quote:
Originally Posted by ransil View Post
following, would like this option on mine.

how are you making the option change
Actually need some proprietary software called Insite to tap into the ECM so having an authorized shop make the changes. Had the Exhaust Brake done then, as tdrees mentioned above, took it to an Allison shop to make changes to the transmission. It just does not feel right and do not want to reinvent the wheel so to speak at $175 per hour.
Ohio44718 is offline   Reply With Quote
Old 10-13-2021, 09:28 AM   #6
Senior Member
 
Ohio44718's Avatar
 
Entegra Owners Club
Spartan Chassis
Join Date: Feb 2016
Location: Canton, Ohio
Posts: 269
Quick update on this saga: After further testing the Engine Brake, it has been determined that the Low Medium High option is not working properly. The Engine Brake is either on 100% or off. Since this is a new to me coach, I do not know if it has ever worked properly. I wanted to rule out a switch issue so called for a pin configuration of the switch. Cummins states it is a chassis or Spartan issue. I called Spartan and they said they provide the harness and the programming, but the OEM installs the switch. Entegra looking into what information they may have on the switch and will call me back.
Update: Kudos for Kelley at Entegra. She got back with a schematic within about 15 minutes. Now I will pull the switch and check it out.
Ohio44718 is offline   Reply With Quote
Old 10-18-2021, 04:49 PM   #7
Senior Member
 
Ohio44718's Avatar
 
Entegra Owners Club
Spartan Chassis
Join Date: Feb 2016
Location: Canton, Ohio
Posts: 269
Well the switch is fine. I went back to the Allison shop this morning to have the programming switched back. From what I have found out, the engine brake is more effective if the engine RPMs are up close to the governed speed. I am now thinking that the issue all along was that I was not able to change from low, medium, or high settings. Coach is back at the Spartan dealer.
Ohio44718 is offline   Reply With Quote
Old 10-18-2021, 07:13 PM   #8
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 24,411
Quote:
Originally Posted by Ohio44718 View Post
Anyone had their exhaust brake and transmission programming changed on the K3 ISX chassis? The standard programming is to activate the engine brake and downshift the transmission when you take your foot off of the accelerator. On my ISC, I had it changed so the engine brake would not kick in until I touched the brake pedal. That allowed me to coast at times and get some free mileage. What I have noticed, even if I turn the exhaust brake off, the transmission downshifts and my RPMs jump up to 2200 to 2300 rpm. I would think that is somewhat hard on the motor plus it obviously starts slowing you down. Or am I doing something wrong?
I assume you were mistaken in your original post where you said you have an exhaust brake.


ISC engines never came with an engine brake, only the ISL and higher. They are completely different items and work totally different.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 10-19-2021, 08:19 AM   #9
Senior Member
 
Ohio44718's Avatar
 
Entegra Owners Club
Spartan Chassis
Join Date: Feb 2016
Location: Canton, Ohio
Posts: 269
Quote:
Originally Posted by Ray,IN View Post
I assume you were mistaken in your original post where you said you have an exhaust brake.


ISC engines never came with an engine brake, only the ISL and higher. They are completely different items and work totally different.
I will see if a moderator can change that. I fortunately got it right in the title but you are absolutely right. Thanks for bringing it to my attention.
Ohio44718 is offline   Reply With Quote
Old 10-19-2021, 09:36 AM   #10
Senior Member
 
Ohio44718's Avatar
 
Entegra Owners Club
Spartan Chassis
Join Date: Feb 2016
Location: Canton, Ohio
Posts: 269
Well, the shop just called about the engine brake. Somewhat simple fix. What he explained to me is that Spartan wiring harness provides connections for 3 different configurations. The 600 hp ISX engine offers Low/Med/Hi settings. There are other connectors available that all plug into the selector switch that would offer Low/Hi, and another only high. They all are physically the same size. When they built the coach, they plugged the wrong connector into the switch. Can not believe the previous owner never noticed.


At this point, I have changed all of the programming back. My reasoning is that normally low is only 2 cylinders, medium 4 cylinders, and high would be all 6 cylinders. All 6 cylinders were being applied all of the time thus why it always felt so aggressive.
Ohio44718 is offline   Reply With Quote
Old 10-19-2021, 09:31 PM   #11
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 24,411
Thank you for posting the results.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 10-22-2021, 01:16 PM   #12
Senior Member
 
Ohio44718's Avatar
 
Entegra Owners Club
Spartan Chassis
Join Date: Feb 2016
Location: Canton, Ohio
Posts: 269
Just picked up the coach and drove it home. Now the low setting is what I would have expected. Could not be happier. Will detail below.


1. Had the ECM program mod done so engine brake would not activate until using brake pedal. Option available when Cummins Insite connected.

2. That was OK but the transmission would automatically downshift when removing foot from accelerator causing RPMs to jump to 2200-2300.

3. Had Allison transmission program changed so it would not attempt to downshift 2 or 3 gears. This was done at an Allison shop using their software.
4. Transmission would still automatically downshift, but RPM stayed down around 1800.

5. After additional investigation, the lower RPMs would also lower the effectiveness of the engine brake. Not good in mountains.
6. Changed transmission programming back to OEM. Engine brake back to normal, but it was determined the Low/Med/High selector was not working properly. Engine brake level was either off or on 100%.
7. Back to my normal shop. It was found that the factory plugged the incorrect connector into the selector switch. Returned ECM programming back to OEM engine brake on when removing throttle.


Summary: Everything now working as expected. Although I can not coast when removing foot from throttle, the engine brake is adjustable and not nearly as harsh. With the ISX set on high, there is some significant engine braking power. All of this time and expense because Entegra did not plug in the correct connector.
__________________
Greg
Entegra Cornerstone 45B
Jeep Wrangler
Ohio44718 is offline   Reply With Quote
Old 10-22-2021, 01:33 PM   #13
Senior Member
 
vito.a's Avatar
 
Monaco Owners Club
Join Date: Oct 2009
Location: Tucson, AZ
Posts: 5,483
Interesting.
Do you have the option to turn the engine brake off so that you can coast?
__________________
97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV
vito.a is online now   Reply With Quote
Old 10-22-2021, 02:48 PM   #14
Senior Member
 
Ohio44718's Avatar
 
Entegra Owners Club
Spartan Chassis
Join Date: Feb 2016
Location: Canton, Ohio
Posts: 269
Quote:
Originally Posted by vito.a View Post
Interesting.
Do you have the option to turn the engine brake off so that you can coast?
Yes. A separate switch and that always worked.
__________________
Greg
Entegra Cornerstone 45B
Jeep Wrangler
Ohio44718 is offline   Reply With Quote
Reply

Tags
brake, chassis, engine



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
Am I doing something wrong? Happytrails3 Class A Motorhome Discussions 9 05-06-2015 08:00 PM
Doing Something Wrong txaggie79 Full-Timers 15 03-23-2015 06:43 AM
Darn it - one of us is doing something wrong RVee'r Just Conversation 13 01-21-2010 11:00 PM
GPS-must be doing something wrong Dona and Elvin Technology: Internet, TV, Satellite, Cell Phones, etc. 14 08-04-2007 12:32 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 04:10 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.