5.9L 12V Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps Related to Performance and Longevity

12 valve fuel pressure?

Old Mar 10, 2010 | 08:31 PM
  #1  
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From: Mo
Default 12 valve fuel pressure?

What is the best fuel pressure to run on my truck? See add ons below, stock turbo.
 
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Old Mar 15, 2010 | 01:02 AM
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I think youd probably want 35 psi. What kind of psi is your Airdog capable of?
 
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Old Mar 15, 2010 | 11:23 AM
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the air dog 150 for a 12v is set @ 30 psi.

you can order an upgraded spring that will boost fuel press to 40 psi but It will not make much of a difference in your case.
 
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Old Mar 15, 2010 | 09:04 PM
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When i put my air dog on they said it was 30 psi but when i checked it it was 12 psi and all of the way up was 35. I backed it down cause all of the way up it smoked alot and had a lot of turbo lag. Now that its back down to 30 it dont smoke but i dont think it runs the way it should.
 
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Old Mar 16, 2010 | 07:55 AM
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Hmmmm...
We just chatted about this on another thread somehwere else.

30psi is fine and will do what you want.

I run 50psi with my FASS and from what it used to be at 24psi to 50psi there was no power gained at all on the dyno.
 
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