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  1. #1
    lenny56's Avatar
    Join Date
    Mar 2015
    Vannes, France

    Smile FZR SHO 2009, I seek advice trimming fuel pressure

    Excuse me for my bad english..
    My name is Pierre, i have 34 years and i live in west of France. I practice jet ski since 6 years and i have several machines (Seadoo GTX 4 tec; Kawasaki ultra 250x; 260X and quad also).
    Today i have a FZR sho of 2009, here configuration:

    -Reprogramming stage 2 (+50ch)
    -Direct air intake
    -compressor wheel Engine Tech low boost
    -Improved cooling circuit
    -Freeflow Riva
    -Fuel pressure reducer adjustable
    -Dump valve Forge
    -Plate Riva
    -Propeller Skat-Trak
    -Column Riva

    Today i sink to see a problem of fuel pressure because the candles are black and end up slamming..
    My actual pressure is 4 bars (58 PSI) and i don't know if this pressure is ok for my configuration.

    Is that someone could advise me to adjust the fuel pressure ?
    Think you very much!


  2. #2

    Join Date
    Mar 2014
    Siesta Key, Fl
    Your best bet it to install a Wideband AF sensor and gauge to find out where you are running and then adjust the Fuel Pressure Regulator (FPR) based on the readings.

    I am sure some of the SHO experts here can give you some pointers on what the common settings are for your configuration. Some info they might need is what injectors you are running (Stock or larger units) and is your FPR running a fixed pressure or a rising rate.

  3. +1 by:

  4. #3
    Ale's Avatar
    Join Date
    Feb 2014
    yes... you have to install wideband AFR gauge... to monitor your air fuel ratio and increase or decrease fuel pressure.

  5. #4
    lenny56's Avatar
    Join Date
    Mar 2015
    Vannes, France
    Ok Thank you very much for your reply!
    I'II wire this week a wideband afr gauge and i wish informed of the result (I actually installs one precisely) (photo).

    Just one last question :
    -trimming of the FPR can be engine idling? or it must go up in the tower?

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  6. #5

    Join Date
    Jul 2005
    Central North Carolina
    set fuel pressure at 54 psi (static fuel regulator not rising rate) this should help you out. This should be ok with a ET low boost wheel. Of course you need a air fuel ratio gauge to fine tune your AFR's Tommy Jordan

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