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  1. #1
    ecpChris's Avatar
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    Baseline Fuel Pressure for xcharger please

    I searched this for literally an hour but couldn't come up with anything. I also know I need an LM-2 but I do have access to one just not for about 2 weeks. Just need a little help
    Have an 06 rxp with ext i/c, 42s, 4inch intake, 255lph walbro, and rrfpr. Air temp ~80° and water temp in the 60s to 70s. What is a good safe base pressure on the fpr in the meantime? I have been using 64 but feel that is way too rich. Wondering what everyone else running this setup uses. Thanks


  2. #2
    Moderator beerdart's Avatar
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    55-60 should be nice and safe

  3. #3
    home of the dislexic fingers breon's Avatar
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    they start at about 60 ..it is there you just dindt see it..

  4. #4
    mrbtd's Avatar
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    Same set up here except an upgraded wheel and 60 is fine

  5. #5
    ecpChris's Avatar
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    Cool thanks guys,
    Bill
    did you use 48s with the et wheel or stuck with the 42s?
    I plan on getting the wheel soon and wasn't sure if i needed to upgrade the injectors while i was at it. I'm looking to stay stock ecu for now

  6. #6
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    I would use the 48's that way u dont have to run such a high pressure. I am using 48's with stock ecu and ET137 wheel and base is 58 and at WOT seems to be around 71 or so with 12.1 AFR

  7. #7
    no reverse jayohentran's Avatar
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    jonny, what afr reading are you getting at idle?

  8. #8
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    I will have to check again but i am pretty sure it was 13.7 or something

  9. #9
    no reverse jayohentran's Avatar
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    cool, i have 42's & an aeromotive rrfpr, and i seem to be rich at idle but good at mid and wot. i'm getting 10.9-11.2 at idle. anyone else running this rich at idle with the 42's?

  10. #10
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    I will put the LM-1 on it again this weekend and log some more of the reading, I just put the aeromotive RRFPR on and ditched the ebay one, and got a nice fuel pressure gauge, fuel rail and braided lines.

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