Results 1 to 10 of 10
  1. #1
    Focker Foggy's Avatar
    Join Date
    Oct 2007
    Location
    Olathe KS
    Posts
    672

    Prop Pitch Vs. Reduction nozzle

    What is better???
    I need to reduce my rpm's. Have moved up to 14/19 impeller,
    but still on rev limiter.
    I know a reduction nozzle will do the trick (Jerry says!),
    but which is more efficient? top speed vs holeshot, etc etc

    please chime in if you have any experience.

    I could pitch up to 14/20 and see what happens, but
    will using the reduction nozzles be faster/etc?


  2. #2
    bigbubba1989's Avatar
    Join Date
    Apr 2009
    Location
    myrtle beach / conway sc
    Posts
    164
    i vote repitch its not hard i just did mine myself the other day well worth it and doesn't cost any money

  3. #3
    Focker Foggy's Avatar
    Join Date
    Oct 2007
    Location
    Olathe KS
    Posts
    672
    I know I could just add to the trailing edge,
    but wanted to know if going
    to a reduction nozzle would gain more speed or
    make things more efficient.

  4. #4
    I'm not sure if it's different for the 3 seaters (I don't know why it would be), but for the RXP the general consensus is that using the 81mm venturi and pitching for whatever your proper RPM are is the best for top end speed.

    If holeshot is your main concern it's probably best to stick with a larger venturi. I don't know how much holeshot you lose when going from the stock 83mm to the 81mm. I don't think I've ever seen any acceleration graphs posted. Some say there is a noticible difference and others dont.

  5. #5
    jpeconsult's Avatar
    Join Date
    Jul 2007
    Location
    Pineville, LA
    Posts
    5,448
    +1
    1
    I agree with Rex. Send that prop to Erik at Speedfreeks. He will get you the as much of both worlds (holeshot/tope end) as possible. Then you can fine tune with rings to get max RPM for that prop.

  6. #6
    I read that some members has reduction nozzle and repitch prop same time...I wonder why doing both!!

  7. #7
    Chris0060's Avatar
    Join Date
    Sep 2007
    Location
    CT
    Posts
    1,174
    Quote Originally Posted by RXP-REX View Post
    I'm not sure if it's different for the 3 seaters (I don't know why it would be), but for the RXP the general consensus is that using the 81mm venturi and pitching for whatever your proper RPM are is the best for top end speed.

    If holeshot is your main concern it's probably best to stick with a larger venturi. I don't know how much holeshot you lose when going from the stock 83mm to the 81mm. I don't think I've ever seen any acceleration graphs posted. Some say there is a noticible difference and others dont.
    Stock ring size on 07 RXP= 83mm?

  8. #8
    jpeconsult's Avatar
    Join Date
    Jul 2007
    Location
    Pineville, LA
    Posts
    5,448
    +1
    1
    Quote Originally Posted by FreakRXP1200 View Post
    I read that some members has reduction nozzle and repitch prop same time...I wonder why doing both!!
    Some folks opt to install the 81mm ring and pitch prop for that. You may also hear that the 83mm nozzle or ring with pro pitch will net best results. I have heard/read both. I will try both when my 83mm ring comes in.

    Quote Originally Posted by Chris0060 View Post
    Stock ring size on 07 RXP= 83mm?
    Yes

  9. #9
    Quote Originally Posted by Chris0060 View Post
    Stock ring size on 07 RXP= 83mm?
    I know the 215 model RXP's are 83mm. I think the 155 is the same. RXP-X and RXT-X are 87mm.

  10. #10
    Chris0060's Avatar
    Join Date
    Sep 2007
    Location
    CT
    Posts
    1,174
    Im sending my prop to Erik this week, and then installing the 83mm.. With stage 2 + mods, Im @ 8180, banging rev limiter a few times.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. prop pitch vs exit nozzle
    By FXSlowKroozer in forum Yamaha PWC Performance (4-stroke)
    Replies: 2
    Last Post: 12-14-2012, 08:17 PM
  2. WTB Looking for a 15/20 prop and Riva reduction nozzle
    By shrabber in forum Sea Doo Classifieds
    Replies: 5
    Last Post: 08-26-2010, 07:49 AM
  3. reduction nozzle/impeller pitch
    By busa504 in forum 4-Tec Performance
    Replies: 2
    Last Post: 01-07-2009, 08:10 PM
  4. reduction nozzle vs impeller pitching
    By vduzin12 in forum 4-Tec Performance
    Replies: 23
    Last Post: 06-14-2008, 01:21 PM
  5. Air Intake Vs. Prop Pitch
    By JFizzleJR in forum 4-Tec Performance
    Replies: 5
    Last Post: 08-10-2006, 10:36 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
  •