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  1. #1
    pwc4life's Avatar
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    Question Fuel Requirements

    How big of supercharger can I fuel with stock ECU, 42# fuel injectors, and RRFPR?

    Supporting motor mods include external IC, rear air intake, Riva waterbox.


  2. #2
    Moderator beerdart's Avatar
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    As big as they make.

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    pwc4life's Avatar
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    So anything up to and including a Rude 3 can be fueled safely with all that?

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    MSRXP's Avatar
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    Yes. But you're gonna need a walbro. If you are gonna run a 3 Rude, sell the 42's for 150 ish and buy Thr 48's and bring the pressure down. JMO!

  5. #5
    pwc4life's Avatar
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    Ok I guess I should have added that I would like to keep the stock fuel pump too. In that case what is the largest supercharger I can run?

    Edit: I should add that I am not looking to run a 3 Rude, I just want to know what my safe supercharger options are with the fueling mods I listed. I'm debating adding more boost, just not sure how much.

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    with 42's the biggest I would run would be the X charger. If you want to go a little bigger ditch the 42's and get 48's with a drop in et 137 wheel for the X charger. With that I would run a external IC as well as a RRFPR and at least a 15/20 prop

  7. #7
    Moderator beerdart's Avatar
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    Im running a B-wheel with 42's

  8. #8

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    Quote Originally Posted by beerdart View Post
    Im running a B-wheel with 42's
    I stand corrected. What ski you running that setup on. You must have that AFR dialed in nice

  9. #9
    Moderator beerdart's Avatar
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    GPRXP Afr is perfect throughout the entire RPM range. Idle fuel pressure 20psi Mid 50psi WOT 75psi. Im using the duel Begi set-up.
    Quote Originally Posted by usaf_mike View Post
    I stand corrected. What ski you running that setup on. You must have that AFR dialed in nice

  10. #10
    pwc4life's Avatar
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    Quote Originally Posted by usaf_mike View Post
    with 42's the biggest I would run would be the X charger. If you want to go a little bigger ditch the 42's and get 48's with a drop in et 137 wheel for the X charger. With that I would run a external IC as well as a RRFPR and at least a 15/20 prop
    Quote Originally Posted by beerdart View Post
    Im running a B-wheel with 42's
    So I could run X charger with ET 137 drop in wheel on stock ECU, stock fuel pump, 42# injectors and RRFPR? Supporting mods being external IC, rear air and Riva waterbox? I understand I would need to check AFR, but with adjustments on the RRFPR this would be sufficient?

    How would the X charger with ET 137 drop in compare to the old Rude 1 SC's? I thought people use to run those with 42#, RRFPR, stock ECU a few years ago? Or maybe I'm mistaken?

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