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  1. #1

    Riva RRFPR psi drop

    is it normal if i have my psi set to 58psi and once i shut the engine down it goes to 40 psi? is this a problem or should psi maintain at 58 after engine is shut down?


  2. #2
    If you have it set up to be rising rate, the pressure in the rail will run about 45 at idle. About 53 with a dead motor and about 65 at WOT if set up correctly. With these settings, you will need a full tune to get the AFRs dialed in.

    If you are not running a RRFPR, then set the fuel pressure to 65 and still get a full tune. 60 PSI may be enough if your injectors are about 60s or larger. You still need a full tune.

    Hope this helps

    Andy

  3. #3
    REID2168's Avatar
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    Quote Originally Posted by DR2006RXP View Post
    is it normal if i have my psi set to 58psi and once i shut the engine down it goes to 40 psi? is this a problem or should psi maintain at 58 after engine is shut down?

    Yes it drops when the engine is shut off for the easy answer your looking for............PERIOD!!!!!!!!!

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  5. #4
    It may drop once the fuel pump stops....

    The 60 lb number assumes about 255 HP at 8500 rpm with a fuel pressure drop of about 50 PSI across the injector, 85% duty cycle and a BSFC of right at 60.

    If you assume my VT11 injectors are really closer to 105 lb and you use the 55% DC that I am getting at WOT, the numbers back into my HP is right at 288. Everything works out just as expected.

    Andy
    Last edited by whittlebeast; 09-18-2013 at 11:19 AM.

  6. #5
    GRF + DashPac:) seadoo02xp's Avatar
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    uuuh the answer is yes......

  7. #6
    REID2168's Avatar
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    Quote Originally Posted by whittlebeast View Post
    It may drop once the fuel pump stops....
    Andy

    that's all he asked ENSTEIN and u don't even know that part..........im not sure why u r making a SCIENCE PROJECT out of this but the REAL QUESTION was if the gauge dropped when the boat was off.........maybe if u learned to read better and understand the initial ? u wouldn't waste all your time trying to show everyone how SMART u think u r when it has JACK SH!T to do with the ? that was actually asked.......now tell me u don't even have an FPR on your boat to know if it drops
    ......JOKE...hahahahahaha....PERIOD!!!!!!!!

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  9. #7
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    Mine goes to zero once shut off and stays where I set base at idle. I monitor afrs via mtxl, couldn't tell you what it goes to once getting going

  10. #8
    REID2168

    And to think, that was the short answer......

    I bet you don't get into EFI programming logic with friends very often.

    Andy

  11. #9
    REID2168's Avatar
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    Quote Originally Posted by whittlebeast View Post
    REID2168

    And to think, that was the short answer......

    I bet you don't get into EFI programming logic with friends very often.

    Andy
    HANDY ANDY I cant program anything don't claim to know anything about duty injector cycle or anything U do in every other post u make...I as well don't try and over step my LIMITED INTELLIGENCE in that or any other area unless I have HANDS ON EXPERIENCE..........however in your case EVERY F*CKING TIME someone asks a SIMPLE YES or NO question about ANYTHING TO DO WITH FUELING u go into duty injector cycle with some RPM range and HP capability that as stated previously doesn't have JACK SH!T TO DO WITH THE F*CKING ?...........if u need it spelled out any plainer than that u have a reading problem OR an intelligence inferiority complex as u try to prove what u know about MATH in every other post not me........ & u have it REAL F*CKING BAD!!!!!!!!
    .....PERIOD!!!!!!!!!

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  13. #10
    Mod less, ride more! troyheb's Avatar
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    Quote Originally Posted by REID2168 View Post
    HANDY ANDY I cant program anything don't claim to know anything about duty injector cycle or anything U do in every other post u make...I as well don't try and over step my LIMITED INTELLIGENCE in that or any other area unless I have HANDS ON EXPERIENCE..........however in your case EVERY F*CKING TIME someone asks a SIMPLE YES or NO question about ANYTHING TO DO WITH FUELING u go into duty injector cycle with some RPM range and HP capability that as stated previously doesn't have JACK SH!T TO DO WITH THE F*CKING ?...........if u need it spelled out any plainer than that u have a reading problem OR an intelligence inferiority complex as u try to prove what u know about MATH in every other post not me........ & u have it REAL F*CKING BAD!!!!!!!!
    .....PERIOD!!!!!!!!!
    I think you nailed that one pretty good, Reid.

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