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  1. #11
    JT jpt7779's Avatar
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    My 2010 T-X S3 hull would consistently stuff at 83-84 mph. I installed tunnel pressure sensor and logged it numerous times. Stuff always happened around 48 psi tunnel pressure and you could feel it coming on 45 psi + with the ass end starting to rise.

    With large PRVs installed I have not stuffed since, using Riva SS grate or R&D grate, 159 or 161mm impellers, and run around 90 mph. I personally ran a nearly identical ski to mine 91 mph with no stuff and PRVs.

    If your going to run 83+ mph you really should consider a PRV setup.

    Every hull is different and will yield different results, BUT participating in a “yard sale” is not fun and you can get seriously hurt!


  2. #12
    Live Fast wave15stx's Avatar
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    Quote Originally Posted by jpt7779 View Post
    My 2010 T-X S3 hull would consistently stuff at 83-84 mph. I installed tunnel pressure sensor and logged it numerous times. Stuff always happened around 48 psi tunnel pressure and you could feel it coming on 45 psi + with the ass end starting to rise.

    With large PRVs installed I have not stuffed since, using Riva SS grate or R&D grate, 159 or 161mm impellers, and run around 90 mph. I personally ran a nearly identical ski to mine 91 mph with no stuff and PRVs.

    If your going to run 83+ mph you really should consider a PRV setup.

    Every hull is different and will yield different results, BUT participating in a “yard sale” is not fun and you can get seriously hurt!
    So 48 psi..good to no I thought it was 40.i have been monitoring mine as well after stuffing a few times. My ski wouldn’t stuff 85++ with no reliefs and one day it did I then put two large prvs. Did you notice any difference in tunnel pressure between 159 and 161?
    Last edited by wave15stx; 09-26-2018 at 07:38 AM.

  3. #13
    JT jpt7779's Avatar
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    Honestly I didn’t pay attention to it. I would suspect the tunnel pressure would be slightly lower.

  4. #14
    MPower's Avatar
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    Is there somebody I can send the pump to to have the PRVs installed?

  5. #15
    Live Fast wave15stx's Avatar
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    Quote Originally Posted by MPower View Post
    Is there somebody I can send the pump to to have the PRVs installed?
    prvs are installed into the pump tunnel

  6. #16
    MPower's Avatar
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    Quote Originally Posted by 1tommygunner1927 View Post
    It's a combination of 159mm pump which reduces to 155mm at the stator, impeller/grate, reduction nozzle sizing and angle of ride plate and/or VTS setting. The simplest solution is NOT to chop the throttle at the end of the run and adding PRVs and the R&D grate.
    Quote Originally Posted by wave15stx View Post
    prvs are installed into the pump tunnel
    Ah yeah, makes sense. Is there a DIY for this?

  7. #17
    meeper's Avatar
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    I still don't understand how the rear of a ski can rise out of the water with that pump sucking in all that water, maybe this is only with 4 blade impellers?

  8. #18
    MPower's Avatar
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    Quote Originally Posted by meeper View Post
    I still don't understand how the rear of a ski can rise out of the water with that pump sucking in all that water, maybe this is only with 4 blade impellers?
    My take has always been the tunnel gets to a point it can no longer process the amount of water coming in at these speeds and pressure. That pressure has to go somewhere and back out the inlet is the only option. Rear comes up and the front noses down which is like throwing an anchor out and launching you off. I came off at 82 with the throttle WFO. Sunday I watched it happen from 5 feet away.

  9. #19
    Live Fast wave15stx's Avatar
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    Quote Originally Posted by MPower View Post
    My take has always been the tunnel gets to a point it can no longer process the amount of water coming in at these speeds and pressure. That pressure has to go somewhere and back out the inlet is the only option. Rear comes up and the front noses down which is like throwing an anchor out and launching you off. I came off at 82 with the throttle WFO. Sunday I watched it happen from 5 feet away.
    yes you can feel the ass end lift right before she’s going to stuff it’s from all the pressure in the tunnel and when it goes you better have a good damn grip and even still I’ve come off at 85 mph it’s not a good feeling

  10. #20
    JT jpt7779's Avatar
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    Quote Originally Posted by MPower View Post
    Ah yeah, makes sense. Is there a DIY for this?
    Read this thread for a start: http://greenhulk.net/forums/showthread.php?t=235606

    Do a search for PRV and you will see numerous threads with lots of ideas.

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