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!! :nail:
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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 |
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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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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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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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have you logged commanded RP v.s. actual?
at least that will tell you if its your tune or hard parts.... |
Actually I think I found the problem. The boost actuator sensor fooler from industrial injection when I got the phatshaft turbo went out on me. I think it was rubbing on the side of the motor or something but it doesn't have continuity anymore so I ordered a new one it should be here Friday. Hopefully that is the reason why it is not pulling any boost either and the rail pressure is sky rocketing. I will let you guys know when I get it on.
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are you running EFI or UDC? Also why are you using a boost fooler when you have tuning and can do anything you want?
Log actual vs commanded to see what is going on. |
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I ordered a new FCA harness today so I will let you guys know if anything changes when I get that on. If anyone can think of anything else please let me know.
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If the ECM is commanding 26k then a new harness/ pigtail won't fix anything. Look at your multiplier tables in the tune (if you can see them, I'm not familiar with the UDC). If the rail pressure isn't overly high while cruising I wouldn't worry about it, more pressure = more power. 26k won't hurt a common rail.
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Check for leaks then.
Is your turbo gated? I'm confused how this fooler is set up, sorry. Did it not always carry rail pressure this high? Or you just now started watching it? |
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I think I just need to upgrade to UDC PRO and see if I just can control it better. :bang |
Nah, I wouldn't blame it on the software 100%. Although it might be a good idea to upgrade, it ran correctly before.
Did you check the wastegate to make sure it's closing, and not opening too soon? |
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WELL got the UDC pro all downloaded so the process begins of learning how to tune all over again with much more complicated tuning haha so if I decide to just give in and finally pay for someone to tune it who would be the best for that?? I really like everything Firepunk does but I don't know of anyone else.
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