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  1. #1

    Water Reducer Disc...

    I`m trying to find out why there are 2 different reducers for the GTX NA/GTX SC/RXP/RXT etc.
    I understand the red is for the GTX`s, and the yelloew disc is for the RXP, what I want to know is why???

    If the red disc is in the GTX SC non-IC, and the yellow disc is in the RXP/RXT? which is IC`d, then wouldn`t it make sense to install the yellow disc in a GTX SC if you added an IC?

    I`m trying to get info on this, but you all could help here:
    When you have your pumps off of all 4-tec models, can you please measure the size of the hole in your reducers for me/us?...

    Maybe I can make a list of what machines have what and why when we`re done collecting info.

    1 variable could be that the pump output between the GTX`s and the RXP/RXT`s are different soley bc the props are larger creating more force/pressure, thus requiring more of a restriction to maintain adequate cooling for the exhaust...this is the kind of correspondences I`m looking for...Thanks...PR...


  2. #2
    JD 1's Avatar
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    dont change the disc unless you change the pump, its all about water pressure+ pump pressure

  3. #3
    Quote Originally Posted by JD 1
    dont change the disc unless you change the pump, its all about water pressure+ pump pressure
    You mean going from the GTX pump to the RXP pump? the only dif is the wear ring ID and larger prop...PR...

    Here is a pic of my reducer, compare it to the one in Fast XPL thru hull post...
    Last edited by Pale Rider; 01-11-2008 at 11:16 PM.

  4. #4
    Fast-XPL's Avatar
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    Here ya go PR
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  5. #5
    Thanks buddy!...PR...

    they look pretty close in size to me...anyone else?...

  6. #6
    Top banana's Avatar
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    The RXP(yellow one ) hole size is 8mm just measured mine for you.

  7. #7
    fabrication guru rapidacceleration's Avatar
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    guys
    those disc reduce the water flow for the exhaust
    they will help maintain propper water box flow as well.
    your gtx didn't need as much water flow becouse there was no intercooler before, and your rpm was in the 7700 range.
    if you were to add a ic and ecu
    1)the water now is being heated by the ic before it even gets to the exhaust. (reason for the bigger flow washers on rxp-rxt)
    2)your now turning roughly say 8100-8500 rpm wich also creates more heat in the exhaust(and another reason for more flow)

    these were just my fiddings on my project.
    when i first built the 4tec xpl i had no "reducer washers" on the xpl pump.
    i found that it loadded the water box up at low rpm.
    since my finddings i have welded the .140 holes and redrilled four .05 holes in the end of my j pipe and added a pisser fitting to the pipe so water can still flow smoothly threw the waterjacket.

  8. #8
    Quote Originally Posted by Top banana
    The RXP(yellow one ) hole size is 8mm just measured mine for you.
    Thanks for checking that out for me, the red disc is smaller than 8mm, but larger than 1/4", I don`t have anything to measure it acurately.

    8mm= 5/16. and the 5/16 drill bit will not fit in the red disc...PR...

    Rapid: are you saying that I should go with the yellow reducer disc, bc I have installed an IC?...PR...

  9. #9
    fabrication guru rapidacceleration's Avatar
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    i would.
    you could try both and see if theres any difference, but the yellow bigger washer should allow more water threw the ic to cool more. but on the down side it will also put more water into the waterbox so there a trade off unless you added a pisser to the j pipe.

    basicly due the yellow washer
    it will be safer to have more water then less.
    after a few hard rides touch the hose after the waterbox to see if its real hot or just warm. this is were you will see if your getting enough water or too much threw the exhaust
    .

  10. #10
    were prolly talking not more than 1/2mm dif between the 2.
    Please explain about to much water in the waterbox???...PR...

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