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  1. #1
    oz_speed's Avatar
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    Mini Rude Fuel Base Pressure

    Fitting a Mini Rude to a friends 2008 RXP ski this weekend I am looking for a good start point on base fuel pressure. Mods are as follow

    Riva ECU
    Bosch 48s
    RRFPR
    XS type intercooler
    4" Kanaflex type intake

    I am sure some one out there must have a ski with similar mods if so your input would be appreciated.


  2. #2
    R88ory RXP's Avatar
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    Start at 60 psi on the key, it will drop some at idle with the boost line attached and then rise with boost, you might want to consider a walbro fuel pump as the stocker has been known to struggle at high pressure.

    Do you have a AFR gauge???

    R88

  3. #3
    oz_speed's Avatar
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    Quote Originally Posted by R88ory RXP View Post
    Start at 60 psi on the key, it will drop some at idle with the boost line attached and then rise with boost, you might want to consider a walbro fuel pump as the stocker has been known to struggle at high pressure.

    Do you have a AFR gauge???

    R88
    We put a Walbro on last week so the pump should be good, I have done the manifold and we are going to be fitting the O2 this weekend also.

    Always nice to have a good start point as i do not really fancy doing to much testing as the water is still very cold. If we can get it somewhere near I will be happy and them we can dial it in better when the weather come warmer.

  4. #4
    monaroman76's Avatar
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    Quote Originally Posted by R88ory RXP View Post
    Start at 60 psi on the key, it will drop some at idle with the boost line attached and then rise with boost, you might want to consider a walbro fuel pump as the stocker has been known to struggle at high pressure.

    Do you have a AFR gauge???

    R88
    I think you will find this to be rich. I think you should start around 50psi. I had my key pressure at about 48psi with a very similar setup to what you have listed. Your idle will be in the 11's with the Riva ecu and 48#

  5. #5
    monaroman76's Avatar
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    If your weather is really cold, perhaps what Rory suggested will be a closer starting point. My temps were pretty high when I was tuning mine.

  6. #6
    oz_speed's Avatar
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    The temp outside now is between 4-6 degrees on a good day in summer we would only see around 25 degrees in air temp.

  7. #7
    monaroman76's Avatar
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    Quote Originally Posted by oz_speed View Post
    The temp outside now is between 4-6 degrees on a good day in summer we would only see around 25 degrees in air temp.
    Jeez, thats friggin cold. Maybe start at 60psi then. Air temp was around 35 when I was tuning my AFR's

  8. #8
    oz_speed's Avatar
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    If we hit 35 it would be one of the hottest days of the year.

  9. #9
    sniper300's Avatar
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    I had the same setup but with a B kit charger ( 14.5lbs boost) . With your current temps you would need somewhere around 70 -75psi of fuel pressure at WOT so around 56 at idle. I found this was safe on mine here in Winter which is probably similar to your weather most of the time. My summer to winter tune varies 13psi of fuel pressure without changing the setup on the ski to achieve the same AFR !!! Problem was in winter the tune is pig rich down low and Mid range and you end up fueling your oil real quick !! Installed a Begi and tune up is great all year round now!!

  10. #10
    Eric Ocman's Avatar
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    56lbs base (non running) with boost line attached is where I would start.

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