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  1. #1
    Moderator beerdart's Avatar
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    Rising Rate Fuel Pressure Regulator?

    I notice that some RRFPR's are installed in parallel (Acting like a relief valve) and some are installed in series.. (Acting like a regulator) What are the advantages and disadvantages to each setup??


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    Quote Originally Posted by beerdart View Post
    I notice that some RRFPR's are installed in parallel (Acting like a relief valve) and some are installed in series.. (Acting like a regulator) What are the advantages and disadvantages to each setup??

    From what I understand by main lining the first without boost line hooked up, you can dial in your AFR at Idle and use the second one as a RRFPR to maintain safe AFR thru mid to high RPM's.

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    If you hook a rising rate reg up what i call the proper way,you can install big injectors without having a rich idle.
    The reg should be hooked into the intake manifold so it recieves a vacuum signal while idling and whenever not into boost.This will lower the base fuel pressure up to 10#s,while still rising 1-1 under boost.

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    Autosport's Avatar
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    Quote Originally Posted by beerdart View Post
    I notice that some RRFPR's are installed in parallel (Acting like a relief valve) and some are installed in series.. (Acting like a regulator) What are the advantages and disadvantages to each setup??
    Are you saying parallel to the factory reg? if so that will not work, because the reg with the lowest fuel pressure setting will always preside (will bleed off any excess fuel to reduce the pressure to what it is set to)

    Regulator needs to be set in Series.

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    Moderator beerdart's Avatar
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    No parallel as in the way the regulator is installed.. See dia.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  6. #6
    R88ory RXP's Avatar
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    Quote Originally Posted by beerdart View Post
    No parallel as in the way the regulator is installed.. See dia.
    I think this is just down to design of regulator. All it is really changing is the amount of fuel it sends back to the tank it can either do this by allowing fuel to pass trough it to the return line at a certain pressure or have the fuel go right through and bleed off to the return line at a certain pressure. Also got to remember that some regulators are before the injectors and some regulators are fitted on the return line its self. Again just down to setup and design of regulator. Hope that makes sense it sorta did to me lol. R88

  7. #7

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    Can you get one like this to work on a rxp 2004?,how or why not,please.



    Enables user to boost fuel pressure from 20 PSI to as much as 80 PSI!
    Can provide enough fuel flow for engines in excess of 650 HP!
    Great for forced induction engines - boost dependent - 1:1 ratio


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    Ride Hard! aha's Avatar
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  9. #9

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    Quote Originally Posted by aha View Post
    Yes i know,but i am trying to keep my costs down,and it is about 8 times
    the price of the one in the pic.

  10. #10
    Ride Hard! aha's Avatar
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    Ahh i c... well maybe you can get it to work... but i would never trust blowing my motor to save some cash.

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