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  1. #1
    Ale's Avatar
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    R&d R4 and pink injectors questions.

    Do you run with vacuum hose ?

    base idle fuel pressure?

    afr at idle... ?
    at 4000?
    at wot?

    Thanks...
    i'm having some trouble to correct tune afr...


  2. #2
    HydroStream6's Avatar
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    I run the pinks with an R3 which I think is the same fueling. I do run with the vacuum reference. At 42lbs base fuel pressure, without the engine running, idle and cruise afr are good but wot is low 11s. At 40lbs it's mid 11 and still good idle and cruise. I'm going to drop it even more and try it though.

  3. #3
    Gus13letter's Avatar
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    Hey there. I got your PM but figure I would post here to also help others with this setup.
    R4 and pink injectors with your setup, run the vacuum line to the rising rate reg. If memory serves me correctly run about 34 psi with vacuum connected, and idling in the water. This would be about 42 psi at zero boost and about 59 psi at 17 psi boost.
    Idle should be about 12.5 afr. WOT should be at 12.2.

  4. #4
    Ale's Avatar
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    Thank you guys.

    i will try to decrease again fuel pressure and make some other tests.
    on the river with the riva rrfpr it's not so easy... ...
    now I understand why people relocate his rrfpr.

  5. #5
    Gus13letter's Avatar
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    Quote Originally Posted by Ale View Post
    Thank you guys.

    i will try to decrease again fuel pressure and make some other tests.
    on the river with the riva rrfpr it's not so easy... ...
    now I understand why people relocate his rrfpr.
    If you have the rrfpr in stock location on top of the tank then absolutely relocate!
    First pic is how I relocated mine and gauge at the rail, then pics of my custom setup with braided lines.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  6. +1 by:

    Ale

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