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  1. #1

    2019 RXT300 Open Loop Cooling

    Does anyone have any experience running this kit on a 2019 RXT300. We have had to run a ball valve on the outlet to restrict flow as the pump restrictor supplied with the kit does not fit a 2019 jet pump. Have also had to remove the second dedicated ntercooler dump as temps were getting to high with. We now have temp under control in the 60-65'c range but after a WOT run the ski needs to be cruised around at 5-6000rpm (not ale to return to idle after WOT) to enable enough flow other wise temps are rising to 85'c+ and giving an overtemp warning. Is this how the kit would normally behave?? Oil temp has been staying with in range. We are turning this thing to 91-200rpm on E85. AFR at WOT are in the 11.5-12 range.


    SKI setup is as follows:
    RIVA Air Intake
    RIVA IMUK
    Fizzle SuperCooler
    ET 142mm Supercharger Wheel
    ET Supercharger Water Cooler
    2000cc injectors
    RIVA RRFPR
    Eastside Stage 3 camshaft and springs/retainers
    RIVA Open Loop Cooling Kit
    RIVA catch can
    340lph AEM Fuel Pump
    VTechTuned Sydney custom tune
    RIVA Free flow exhaust and waterbox

    Any advice or experience from people that have used or are running this kit would be greatly appreciated.

  2. #2


    Pump restrictor on top is what is fitted to the 2019 RXT, pic below is the supplied restrictor from RIVA.
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  3. #3
    Cosmicbrut's Avatar
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    Hve you tried not restricting flow with the ball valve and using the dedicated dump to keep pressure in check?

  4. #4
    With the dedicated dump it wasn't enough flow through engine and temps went too high.

  5. #5
    Cosmicbrut's Avatar
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    It was too high even with not restricting the inlet flow at all?

  6. #6
    When we ran the dedicated intercooler dump it took majority of the water flow (path of least resistance) and didn't allow enough water to flow through the engine causing engine temp to rise.

  7. #7

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    the restrictor is built into the pump shoe. if you look through the passage it tapers down

  8. #8
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by markvan View Post
    When we ran the dedicated intercooler dump it took majority of the water flow (path of least resistance) and didn't allow enough water to flow through the engine causing engine temp to rise.
    That makes total sense to me! Isn't there large disc used in the T stat housing to calibrate the water flow?

  9. #9
    Myrak's Avatar
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    The Open Loop comes with a thermostat now, and don't have a dedicated dump. like you would in a closed loop set up


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