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04-09-2015, 06:57 PM
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#1
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Senior Member
Join Date: Nov 2011
Posts: 103
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Recalibrating a 08 Cummins 350DP to 400
Understand a 350 can be recalibrated to a 400. Has anyone out there had this done and what performance (MPG, power, torque, etc.) have you noticed. Thanks!
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04-09-2015, 08:53 PM
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#2
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Senior Member
Join Date: Apr 2010
Location: SW, Michigan
Posts: 629
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Quote:
Originally Posted by glemo81540
Understand a 350 can be recalibrated to a 400. Has anyone out there had this done and what performance (MPG, power, torque, etc.) have you noticed. Thanks!
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I recommend you discuss with your Cummins Coach Care dealer. Could be a simple flash install depending which engine you have.
Recommend Cummins before buying upgrade from another company.
__________________
2010 Allegro RED 36 QSA
GMC Envoy 4x4
 SW Michigan to Alaska in 2015
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04-09-2015, 09:02 PM
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#3
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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ISC or ISL?
Could even be an ISB.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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04-09-2015, 09:08 PM
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#4
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Senior Member
Join Date: Dec 2012
Location: Full Timing
Posts: 751
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Quote:
Originally Posted by Mr_D
ISC or ISL?
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Need to know what you're starting with.
__________________
Mike
2003 Alpine Coach 40MDTS - 400HP Cummins ISL
Can Am Spyder Roadster
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04-10-2015, 02:50 AM
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#5
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Senior Member
Join Date: Nov 2011
Posts: 103
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Should have stated the engine is an ISL.
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04-10-2015, 03:20 AM
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#6
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Senior Member
Join Date: Nov 2011
Posts: 103
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ISL from 350 to 400
Cummins Customer Service is who told me recalibration is possible!
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04-10-2015, 09:11 PM
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#7
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Senior Member
Join Date: Apr 2003
Location: Rochester, MN, USA
Posts: 374
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Somewhere on this forum I remember reading that the 350HP ISL was a lightweight engine/transmission combination designed for better fuel economy. In my case it did not work well. My MPG runs at 7.2.
I'll be interested in your experience if you get the upgrade done.
Have a nice day - Darrel
__________________
2007 3912 KSDP w/350HP ISL Cummins
2003 Grand Cherokee toad w/M&G Brake
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04-10-2015, 09:25 PM
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#8
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by Darrel
Somewhere on this forum I remember reading that the 350HP ISL was a lightweight engine/transmission combination designed for better fuel economy. In my case it did not work well. My MPG runs at 7.2.
I'll be interested in your experience if you get the upgrade done.
Have a nice day - Darrel
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That's not very good mileage as you say!
Our Magna (46,503+ EMPTY) towing the Odyssey with an ISX 650 is getting 7.1 overall. That includes the Grapevine, Tehachapi and stuck in traffic after a wreck.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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04-10-2015, 09:31 PM
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#9
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Senior Member
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,706
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