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Old 09-12-2017, 04:00 PM   #1
5.9
 
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Rail Pressure to High

Hey guys tuning question again. I have my rail pressure set to max out at WOT at 23,000 psi. I am having trouble with it going to 26k and 27k at only 65% throttle, and I don't know why it would do that. Does the rail pressure change due to ambient temp. or to elevation?? I live in Colorado and we are at 5,000 to 6,000ft elevation. Just a little stumped and don't want to blow an injector body. Any help or tips would be greatly appreciated!!
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2005 CTD 2500, 62/65 over 75/96 compounds, 100% Exergy, 425 ARP, 3250 SBDD, pushrods, valve springs, FASS 150 w/sump, 5" magnaflow, 24" FTE resonator, 85% over dragon fire CP3, Smarty UDC.
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Old 09-13-2017, 06:55 AM   #2
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Read this thread and check voltage on the FCA harness, that is where I found my issue after months of parts swapping.

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Old 09-13-2017, 09:03 AM   #3
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Originally Posted by 06 DIESEL View Post
Read this thread and check voltage on the FCA harness, that is where I found my issue after months of parts swapping.

P088 and P0251 - Competition Diesel.Com - Bringing The BEST Together
Thank you I will look into this and see if that is the problem!! The CP3 is about 2 years old from Industrial so maybe it needs a new FCA.
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Old 09-13-2017, 02:59 PM   #4
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Might need to adjust the PID controller for the pump control. If you don't have it already you should really upgrade to UDC pro so that you can control the pump better.
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Old 09-18-2017, 03:47 PM   #5
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Might need to adjust the PID controller for the pump control. If you don't have it already you should really upgrade to UDC pro so that you can control the pump better.
I am pretty new to the tuning world so what is the PID controller on UDC PRO??
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2005 CTD 2500, 62/65 over 75/96 compounds, 100% Exergy, 425 ARP, 3250 SBDD, pushrods, valve springs, FASS 150 w/sump, 5" magnaflow, 24" FTE resonator, 85% over dragon fire CP3, Smarty UDC.
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Old 09-18-2017, 10:06 PM   #6
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Just out of curiosity did you try an scale the Fuel pressure sensor in your tuning, or just adjust the map itself to stop at 23 WOP
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Old 09-18-2017, 10:10 PM   #7
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Read this thread and check voltage on the FCA harness, that is where I found my issue after months of parts swapping.

P088 and P0251 - Competition Diesel.Com - Bringing The BEST Together

Also had similar issue with mine a year or so ago with rail pressure to high. I had bad fuel which was causing the fca stick open. After swapping pumps an 3 fca's later I finally realized bad fuel was causing it. But thanks to 06 Diesels thread It helped me find it.
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Old 09-19-2017, 02:21 PM   #8
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Originally Posted by Cummins6.7trip View Post
Just out of curiosity did you try an scale the Fuel pressure sensor in your tuning, or just adjust the map itself to stop at 23 WOP
ya I just changed the map on the pressure to stop at 23k. I think I just need to upgrade to UDC Pro and so if that will help
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