Page 1 of 2 12 LastLast
Results 1 to 10 of 20
  1. #1
    MPower's Avatar
    Join Date
    May 2005
    Location
    Raleigh, NC
    Posts
    3,348
    +1
    121

    RXTX S3 pump stuffing at 80+ mph

    Is pump stuffing on the T3 hull common?

    Running the stock prop and grate at 8300ish RPM at 83ish MPH.

    100s of top speed runs and have been launched at 82 mph and multiple other instances where it bucked hard but stayed on the ski. Sometimes its fine, but it bites on occasion.

    Is it the stock prop or grate or both causing this issue?

    2016 RXTX 300 - only mods are air intake, full thru-hull exhaust, IMUK, Riva tune

    Stock prop, grate, rideplate, nozzle, etc.


  2. #2
    Bob 1tommygunner1927's Avatar
    Join Date
    Apr 2007
    Location
    Houston, Texas
    Posts
    7,751
    +1
    1,571
    Quote Originally Posted by MPower View Post
    Is pump stuffing on the T3 hull common?

    Running the stock prop and grate at 8300ish RPM at 83ish MPH.

    100s of top speed runs and have been launched at 82 mph and multiple other instances where it bucked hard but stayed on the ski. Sometimes its fine, but it bites on occasion.

    Is it the stock prop or grate or both causing this issue?
    Stock pump & stock ride plate (unmodified)?

  3. #3
    MPower's Avatar
    Join Date
    May 2005
    Location
    Raleigh, NC
    Posts
    3,348
    +1
    121
    Quote Originally Posted by 1tommygunner1927 View Post
    Stock pump & stock ride plate (unmodified)?
    Yes sir, updated my post.

    Stock prop, stock rideplate, stock nozzle....stock everything when it comes to the hull, pump, etc.

  4. #4
    MPower's Avatar
    Join Date
    May 2005
    Location
    Raleigh, NC
    Posts
    3,348
    +1
    121
    I was tossed at 82mph with the throttle pinned (didn't let out).

    Yesterday, I was riding a 2018 RXTX ST3 that I just tuned, racing the S3 ski side by side throttle pinned and I watched the ass of that ski come what looked like a foot out of the water.

    The only thing different from this ski and a RIVA "stage 2" is it is running the stock prop. I never installed the Solas since they were exploding and RIVA would never do a return for the Skat prop.

  5. #5
    Bob 1tommygunner1927's Avatar
    Join Date
    Apr 2007
    Location
    Houston, Texas
    Posts
    7,751
    +1
    1,571
    Quote Originally Posted by MPower View Post
    Yes sir, updated my post.

    Stock prop, stock rideplate, stock nozzle....stock everything when it comes to the hull, pump, etc.
    Typically, The S3 hull will show signs of stuffing around 82-84, according to those who have measured tunnel pressure. If I recall correctly, 48 psi is the buck point! Time for some PRV's.

  6. #6
    MPower's Avatar
    Join Date
    May 2005
    Location
    Raleigh, NC
    Posts
    3,348
    +1
    121
    Quote Originally Posted by 1tommygunner1927 View Post
    Typically, The S3 hull will show signs of stuffing around 82-84, according to those who have measured tunnel pressure. If I recall correctly, 48 psi is the buck point! Time for some PRV's.
    So it's not related to the stock prop/grate?

    RIVA sells kits that makes this ski run those speeds. No mention of stuffing or PRV from them, WTF!

  7. #7
    Bob 1tommygunner1927's Avatar
    Join Date
    Apr 2007
    Location
    Houston, Texas
    Posts
    7,751
    +1
    1,571
    Quote Originally Posted by MPower View Post
    So it's not related to the stock prop/grate?

    RIVA sells kits that makes this ski run those speeds. No mention of stuffing or PRV from them, WTF!
    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.

  8. #8
    Fastest 2016 with your mods ive ever seen. Down river>?
    Nice sig...

  9. #9
    MPower's Avatar
    Join Date
    May 2005
    Location
    Raleigh, NC
    Posts
    3,348
    +1
    121
    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.
    That is what is concerning. It is stuffing with the throttle pinned. I learned a long time ago not to chop the throttle when running these speeds.

    Quote Originally Posted by xpl2008 View Post
    Fastest 2016 with your mods ive ever seen. Down river>?
    Nice sig...
    Speed results are in a fairly stagnate lake (dams were closed at both ends). Yesterday it was running 83 avg in both directions. Temps were good for power and I am only at 200ft elevation.

  10. #10
    Live Fast wave15stx's Avatar
    Join Date
    May 2007
    Location
    new jersey
    Posts
    2,367
    +1
    52
    What was the trim at when she stuffed?was there any signs of it walking or lifting in the rear prior to it stuffing the pump? I’ve been monitoring tunnel pressure but heard different numbers can anyone confirm at what pressure it will stuff?

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. FS 2010 rxtx S3 pump with stainless wear ring
    By mibunkerking in forum Sea Doo Classifieds
    Replies: 6
    Last Post: 08-31-2016, 04:36 PM
  2. 2010 RXTX S3 pump support broken
    By SLASHER in forum 4-Tec Performance
    Replies: 15
    Last Post: 06-15-2015, 05:53 PM
  3. stock grate and plate at 80 plus mph
    By boostedf12x in forum Kawasaki PWC Performance (4-stroke)
    Replies: 4
    Last Post: 11-24-2011, 06:25 PM
  4. Trying to join 80 mph club with 2011 rxtx 260
    By DON1098 in forum 4-Tec Performance
    Replies: 136
    Last Post: 10-04-2011, 11:30 AM
  5. Drifting to the right at 80 mph, at high boost
    By Louis914 in forum 4-Tec Performance
    Replies: 29
    Last Post: 06-07-2009, 07:08 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •