Page 1 of 3 123 LastLast
Results 1 to 10 of 28
  1. 07-05-2005, 10:30 AM #1
    johnD
    johnD is offline
    Join Date
    Apr 2005
    Posts
    133

    Boring Out Venturi to Regain RPM's?

    What do you guys think of boring out the venturi to regain lost rpm's due to heat? Will I be able to get back revs and a little speed? I don't expect it to be as fast as before but at least get my revs up tp 7900 coz I am only at 7600-7700 right now. Thanks!

    John
    Reply With Quote Reply With Quote

  2. 07-05-2005, 10:38 AM #2
    Green Hulk
    Green Hulk is offline
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Location
    Morgan City, LA
    Posts
    38,010
    +1
    3,161
    I wouldn't advise it. You should look into repitching your impeller.
    Reply With Quote Reply With Quote
  3. 07-05-2005, 12:51 PM #3
    rx4pain
    rx4pain is offline
    rx4pain's Avatar
    Join Date
    Apr 2005
    Location
    Olympia, WA
    Posts
    1,993
    +1
    7
    I was going to post something about this...over on SD.net I read someone with a PPG Level II kit (RR ECU and IC basically) bored their venturi nozzle to 84mm and he said he actually increased his acceleration and his top speeds were something like 74 to 76 with full and low fuel in high temp weather...is this for real?
    Reply With Quote Reply With Quote
  4. 07-05-2005, 01:15 PM #4
    seadoo02xp
    seadoo02xp is offline
    GRF + DashPac:) seadoo02xp's Avatar
    Join Date
    Apr 2005
    Location
    MO
    Posts
    4,752
    +1
    1,056
    yes sir it is for real, i guess i could take a picture of my gps but i didnt, but the thing with my setup is.....ppg pitched my prop too tall on teh top end but for some reason i still had killer acceleration but it just couldnt pull past 8100 rpm, so i bored it out about 2 mm added a riva intake and my r's were right up there where i needed them and i was hitting teh speeds i posted, i wouldnt recommend it on a stock ski though, i have everything hulk had before he ported his head, so i guess you could call it a level 2, but it is no bullshit, it worked for me, i have a small amount of prop spin at takeoff if i nail it from idle, possibly the pitch or nozzle is causing this, i have a ss wear ring and the impeller is in perfect shape, so who knows but if i just barely off idle punch it it hooks up perfect,
    Reply With Quote Reply With Quote
  5. 07-05-2005, 02:15 PM #5
    RXPDAVID
    RXPDAVID is offline
    RXPDAVID's Avatar
    Join Date
    Apr 2005
    Location
    West Tennessee
    Posts
    403
    Seadoo02xp, Did you bore the steering nozzle also? If so how much?
    Reply With Quote Reply With Quote
  6. 07-05-2005, 03:11 PM #6
    seadoo02xp
    seadoo02xp is offline
    GRF + DashPac:) seadoo02xp's Avatar
    Join Date
    Apr 2005
    Location
    MO
    Posts
    4,752
    +1
    1,056
    no i didnt touch the steering at all,
    Reply With Quote Reply With Quote
  7. 07-05-2005, 03:14 PM #7
    Jarrett
    Jarrett is offline
    Jarrett's Avatar
    Join Date
    Apr 2005
    Location
    Waxahachie, TX
    Posts
    3,011
    +1
    77
    seadoo02xp, great numbers. I'd love to see a video of another RXP hitting 76+ MPH. Think you can hook that up? I bet Hulk would host it for you. What do you say?
    Reply With Quote Reply With Quote
  8. 07-05-2005, 03:26 PM #8
    Thomas
    Thomas is offline
    Thomas's Avatar
    Join Date
    May 2005
    Location
    Washington
    Posts
    396
    I've been tempted to send my venturi to skat-trak to have them bore it out to install the interchangable rings.

    I love the top speed, but I would gladly trade 1-3mph for acceleration.
    Reply With Quote Reply With Quote
  9. 07-05-2005, 04:56 PM #9
    seadoo02xp
    seadoo02xp is offline
    GRF + DashPac:) seadoo02xp's Avatar
    Join Date
    Apr 2005
    Location
    MO
    Posts
    4,752
    +1
    1,056
    well i would if i had a video camera, i guess we will just have to imagine it, haha, i guess i could take a pic of my gps thats the best i can do
    Reply With Quote Reply With Quote
  10. 07-05-2005, 05:29 PM #10
    Jarrett
    Jarrett is offline
    Jarrett's Avatar
    Join Date
    Apr 2005
    Location
    Waxahachie, TX
    Posts
    3,011
    +1
    77
    Quote Originally Posted by seadoo02xp
    well i would if i had a video camera, i guess we will just have to imagine it, haha, i guess i could take a pic of my gps thats the best i can do
    Ah bummer, guess we will just have to put on our fantasy caps for that one...
    Reply With Quote Reply With Quote
Page 1 of 3 123 LastLast
« R&D RXP Pro Steering Nozzle | Mark S how is your ski running? »

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. How to test RPM's while out of water
    By PrimeVXR in forum 4-Tec Performance
    Replies: 10
    Last Post: 06-30-2017, 04:00 PM
  2. boring out a ultra 130 to 2.0 mm over
    By waterboys in forum Conversion PWC Performance Skis
    Replies: 0
    Last Post: 02-11-2016, 03:50 PM
  3. MSX 150 revs out of control up to 7900 rpms...wont stop
    By Rhett in forum Polaris Open Discussion
    Replies: 8
    Last Post: 09-27-2014, 12:46 PM
  4. RPM Raises to 4500 RPM and higher on its own out of water
    By bj25430 in forum 2-Stroke Performance
    Replies: 2
    Last Post: 07-13-2007, 12:11 PM
  5. RIVA Stage 1 installed! Down to 7700 RPMs. Any pointers?
    By sgaaap in forum 4-Tec Performance
    Replies: 15
    Last Post: 10-01-2005, 10:56 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
  •  

Forum Rules