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  1. #1
    Chris0060's Avatar
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    Fuel pressure with X charger?

    What are some of you running for fuel pressure?
    some of the mods: x charger, RRFPR, 42's, JFizzle IC, 4 inch kanaflex front intake...


  2. #2

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    Isnt there a recommended or a set pressure to use? I was thinking about putting the x-charger in mine also. Do you have a a/f meter?

  3. #3
    Chris0060's Avatar
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    Quote Originally Posted by Speed_Freak_039A View Post
    Isnt there a recommended or a set pressure to use? I was thinking about putting the x-charger in mine also. Do you have a a/f meter?
    I ran the ski once so far.. a/f was 13.2- 11.9.. But that was with a boost leak. I just wanted to be safe and see where everyone else was, before retesting.

  4. #4
    speedskixp's Avatar
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    Quote Originally Posted by Chris0060 View Post
    I ran the ski once so far.. a/f was 13.2- 11.9.. But that was with a boost leak. I just wanted to be safe and see where everyone else was, before retesting.
    11.9 is great at wot. In my testing here in florida I have found that a wot pressure around 70lbs is needed with 42s. Your base pressure depends on how much rise you are actually seeing from your reg.

  5. #5
    R88ory RXP's Avatar
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    I need 70-72 in UK at sea level to be safe, I have a base of 68 to achieve this tho. As Speedski said it all depends on what rise you getting out of your reg. Mine dont rise so good so I have to run a higher base, Im looking at getting a BEGI fmu now. This will let me get it right as it is and then when I want more boost I will be able to tune for that also. R88

  6. #6
    Dave Sharp dav_dman's Avatar
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    Quote Originally Posted by R88ory RXP View Post
    I need 70-72 in UK at sea level to be safe, I have a base of 68 to achieve this tho. As Speedski said it all depends on what rise you getting out of your reg. Mine dont rise so good so I have to run a higher base, Im looking at getting a BEGI fmu now. This will let me get it right as it is and then when I want more boost I will be able to tune for that also. R88
    the begi fmu only works by pinching the return line from the fuel rail...we have no return fromt the fuel rail. Are you replacing your fuel rail or tapping the end and running another return from the begi to the fuel tank?

  7. #7
    speedskixp's Avatar
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    Quote Originally Posted by dav_dman View Post
    the begi fmu only works by pinching the return line from the fuel rail...we have no return fromt the fuel rail. Are you replacing your fuel rail or tapping the end and running another return from the begi to the fuel tank?
    The begi will also work off of the return on your existing reg but you will need to remote mount it. No need to tap your rail unless you want to.

  8. #8
    Dave Sharp dav_dman's Avatar
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    Quote Originally Posted by speedskixp View Post
    The begi will also work off of the return on your existing reg but you will need to remote mount it. No need to tap your rail unless you want to.
    have you tried this? I thought the rail would have to be inside the circuit. Supply Line in fr tank to fpr then supply line out to rail. Return Line out from fpr back to tank and begi in that line would only increase pressure between the begi and the fpr..not the begi and the rail...or so i thought.

    Are you sure?

  9. #9
    Moderator beerdart's Avatar
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    The Begi is in series with the 1:1 so it can go before or after the rail.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  10. #10
    Doel Tiburon1264's Avatar
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    Hey Guys,

    I'm running a 2006 RXT with a X+SC, 42lbs injectors 15/20r impeller and with a 80mm ring. I have my RRFPR setup at 60. It's this setup is Okay. Yesterday, Top Speed on GPS was 74.2 Flat Salt Water.

    Thank You,

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