Page 1 of 2 1 2 LastLast
Results 1 to 10 of 17
  1. #1
    suck my wake's Avatar
    Join Date
    Apr 2006
    Location
    Sugar Grove IL
    Posts
    2,872
    +1
    12

    RXP pump tunnel pressure #'s

    Has anyone done any testing to see what the best tunnel pressure is on an RXP @ 85mph+?????


  2. #2

    Join Date
    Aug 2006
    Location
    Gonzales, La
    Posts
    2,145
    +1
    9
    subscribing.

  3. #3
    Duke's Avatar
    Join Date
    Jul 2006
    Location
    Florida
    Posts
    10,004
    +1
    406
    Only person I know of that said they tested tuneel pressure was JD 1.

    Would be very interesting to know how it compares to the GPR pressures.

  4. #4
    dhoad's Avatar
    Join Date
    Aug 2005
    Location
    North Aurora, Illinois, United States
    Posts
    3,182
    +1
    6
    ttt

  5. #5
    suck my wake's Avatar
    Join Date
    Apr 2006
    Location
    Sugar Grove IL
    Posts
    2,872
    +1
    12
    If JD knows he's not giving up the info, I already asked him It blows my mind that know one has any info on this, yet the GPR guys have pages and pages if info and they are SHARING it I understand that there are many variables but there has to be that all improtant number to stay away from?

  6. #6

    Join Date
    Aug 2006
    Location
    Gonzales, La
    Posts
    2,145
    +1
    9
    For cryin out loud, all it takes is a pressure gauge, hose, and fitting. Will someone please do it? I'm too busy installing my new turbo. . .

  7. #7
    JD 1's Avatar
    Join Date
    Aug 2005
    Location
    St. Louis, MO
    Posts
    4,186
    +1
    90
    Quote Originally Posted by suck my wake View Post
    If JD knows he's not giving up the info, I already asked him It blows my mind that know one has any info on this, yet the GPR guys have pages and pages if info and they are SHARING it I understand that there are many variables but there has to be that all improtant number to stay away from?
    I do not have any p pressure #'s for the RXP, just the X.

    the numbers on the X are all over the place due to mods/rpm's/hull angle
    I have 2 guages on the X at one time, the one gauge has a oneway valve that holds the highest number.....

    hope this helps

  8. #8

    Join Date
    Sep 2007
    Location
    Lexington, Ky
    Posts
    1,656
    I'll gladly do this, if someone would tell me where I can tap for a gauge without my tunnel exploding, and without a pump extension.

    Should I drill a hole right through the fiberglass in the top of the tunnel? I suppose I could, and just reinforce it. I was thinking a 3/8" threaded rod, with a retaining nut on both the inside and outside of the tunnel, and just grind it flat, and fiberglass it flush on the inner tunnel. I don't think this is wise, or the best way to do it, but only way I can think of.

    There appears to be enough room to tap the pump housing through the wear ring, before the prop, but is this too close to the impeller? This wont give me an accurate tunnel pressure reading will it? It will give me the pressure against the impeller?

    This "hole" I'm making will also be my pressure relief as well as used to measure tunnel pressure, so if the location wont work for a pressure relief also, I'm not doing it...

    I even bought an extra pump that I could drill on, but will a RXP pump fit on an RXP-X I'm starting to think it wont??

  9. #9
    Vern's Avatar
    Join Date
    May 2005
    Location
    Grand Haven, MI
    Posts
    3,594
    +1
    128
    Quote Originally Posted by JD 1 View Post
    I do not have any p pressure #'s for the RXP, just the X.

    the numbers on the X are all over the place due to mods/rpm's/hull angle
    I have 2 guages on the X at one time, the one gauge has a oneway valve that holds the highest number.....

    hope this helps
    Dan, could you specify which gauge you have that has the oneway valve? They are not very easy to find.

    The only way I can think of to vent the pump tunnel pressure on an RXP without the pump extension is to install a 3/4 inch thru hull fitting in the pump tunnel, feeding INTO the hull, then run a hose with a 90 degree bend straight out the transom with another thru-hull above/to the side of the pump. Maybe put a valve inline if that is too big ... But honestly I am not sure I would ever want to do it on my RXP ... I have no buck, the ski runs great, so what would I gain by doing this? It would add a risk of water in the hull too. With the pump extension is another story altogether, it would be less risky, but again, what would we gain?

  10. #10

    Join Date
    Sep 2007
    Location
    Lexington, Ky
    Posts
    1,656
    In my case I want a pump tunnel pressure relief for my P-X. I've never experienced the "buck" nor do I ever want to... but I don't think I'm going fast enough yet to see it. That being said I'm afraid to bolt on my Rude2 before I address this. I'm willing to do whatever it takes, I understand exactly how to make a pressure relief system if someone would just advise me on where to drill the Fu!#ing hole....

    Drilling holes through the pump shoe/intake greate is just too ghetto for me, that's not the proper fix. obviously, as people still get the buck with drilled pump shoes...

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Motec M130 EGT and pump tunnel pressure monitoring
    By jpt7779 in forum 4-Tec Performance
    Replies: 3
    Last Post: 05-31-2014, 12:33 PM
  2. Pump tunnel pressure monitoring idea
    By Stockrxp in forum 4-Tec Performance
    Replies: 28
    Last Post: 12-30-2011, 07:50 AM
  3. Rideplate screws missing, grate ripped off, pump tunnel pressures.
    By bowsniper in forum Polaris Open Discussion
    Replies: 0
    Last Post: 11-18-2010, 09:52 PM
  4. pump tunnel support removal rxp 215
    By JimC in forum 4-Tec Performance
    Replies: 11
    Last Post: 09-26-2008, 08:51 PM
  5. Pump tunnel pressure gauge
    By RUNWME in forum Yamaha How To & FAQs
    Replies: 4
    Last Post: 11-12-2007, 09:14 AM

Posting Permissions

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