Page 1 of 2 1 2 LastLast
Results 1 to 10 of 11
  1. #1
    Mothman's Avatar
    Join Date
    May 2011
    Location
    West Texas
    Posts
    2,996
    +1
    1,477

    Steepest pitch possible?

    What is the steepest pitch possible, while maintaining efficiency, for a 15/22r Solas 4 blade? Slow91 pitched a 15/22 to a 15/25 for me, and it's great, buuuuut, I'm turning it to 8600 here at 3000ft, and will need more pitch for lower elevation. My 8800 limit must have a soft limiter at 8700-8720, because last year's build would sit there (while at 1000ft). It would turn 83-8400 here in Lubbock, and it would gain @200rpm for every drop of 1000ft (same air temp, etc). I expect similar gains for this build, and am aiming for 8100ish here at elevation, which should put me back to 8700ish near sea level.
    Thanks for any help guys!


  2. #2
    boost junkie skidoochris's Avatar
    Join Date
    Mar 2012
    Location
    Davison, Mi
    Posts
    4,494
    +1
    476
    the 3 blade 15.5/22.5 can hold 18psi to 8300

  3. #3
    Mothman's Avatar
    Join Date
    May 2011
    Location
    West Texas
    Posts
    2,996
    +1
    1,477
    3 blades absorb top speed, though pull harder in the bottom to mid, right? Mine pulls from the hole like a beast now, aside from my left prv sticking open now and again. What a pita to fumble around to pop it closed.
    If at all possible I'd like to stick with a 4 blade. Also, I'm using the stock 83 venturi. I'd rather not change ventiris, but I could choke it down to 81 if needed.

  4. #4
    Having Fun jp1300r's Avatar
    Join Date
    Sep 2005
    Location
    Florida
    Posts
    5,334
    +1
    261
    Quote Originally Posted by Mothman View Post
    What is the steepest pitch possible, while maintaining efficiency, for a 15/22r Solas 4 blade? Slow91 pitched a 15/22 to a 15/25 for me, and it's great, buuuuut, I'm turning it to 8600 here at 3000ft, and will need more pitch for lower elevation. My 8800 limit must have a soft limiter at 8700-8720, because last year's build would sit there (while at 1000ft). It would turn 83-8400 here in Lubbock, and it would gain @200rpm for every drop of 1000ft (same air temp, etc). I expect similar gains for this build, and am aiming for 8100ish here at elevation, which should put me back to 8700ish near sea level.
    Thanks for any help guys!
    You already past efficency at 15/25. Max 15/23-24 after that you are just dropping rpm and not gaining speed.

    You need to raise your rpm limit.

    You can choke down to a 81mm on an RXP, but that also kills top speed when trying to get to the mid 80's.

  5. +1 by:

    WFO

  6. #5
    Mothman's Avatar
    Join Date
    May 2011
    Location
    West Texas
    Posts
    2,996
    +1
    1,477
    Crap. I don't want to spin it past 9k, but I have no other choice unless I never leave this elevation. I don't have gps numbers on the 15/25. It would do 83 on the limiter 8720 last year with a 15/22, so it should be higher, but efficiency-wise I may be chasing my tail.
    Thanks, I appreciate the input.

  7. #6
    GRF + DashPac:) seadoo02xp's Avatar
    Join Date
    Apr 2005
    Location
    MO
    Posts
    4,559
    +1
    948
    I ran a 16/25 pitched by impros with pretty good results . Mid and top end was great but it spun out of the hole and out of a hard turn . I spun it to 8900 with 18 psi .

  8. #7
    Mothman's Avatar
    Join Date
    May 2011
    Location
    West Texas
    Posts
    2,996
    +1
    1,477
    Quote Originally Posted by seadoo02xp View Post
    I ran a 16/25 pitched by impros with pretty good results . Mid and top end was great but it spun out of the hole and out of a hard turn . I spun it to 8900 with 18 psi .
    I was showing a tad under 19psi at 8720 last year. It turned out my charger slip was also a little under 19, which makes me wonder if it had a bit more in it had I not been on the limiter. This was at 1000ft of elevation though.
    I'm going to run this 15/25 in Lubbock. If I travel, I'll need to raise my rev limit or try the 3 blade skidoochris recommended.

  9. #8
    GRF + DashPac:) seadoo02xp's Avatar
    Join Date
    Apr 2005
    Location
    MO
    Posts
    4,559
    +1
    948
    19 psi on what charger?

  10. #9
    Mothman's Avatar
    Join Date
    May 2011
    Location
    West Texas
    Posts
    2,996
    +1
    1,477
    An et race like the one I nearly bought from you. I couldn't pry open the wallet enough for a turbo build... lol I built an ic using a garrett 1000 core and use much larger piping. The restriction is practically nada. Water was cool-ish, air was 80 or so.

  11. #10
    GRF + DashPac:) seadoo02xp's Avatar
    Join Date
    Apr 2005
    Location
    MO
    Posts
    4,559
    +1
    948
    That's good boost for that charger . I've never heard of them going that high in reality

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. What pitch impeller
    By Turbo Todd in forum 4-Tec Performance
    Replies: 10
    Last Post: 11-21-2008, 10:55 AM
  2. RXP speeds vs rpm and impeller pitch
    By Vern in forum 4-Tec Performance
    Replies: 21
    Last Post: 02-10-2007, 11:35 PM
  3. Need your input on a possible purchase
    By Jeff C in forum Sea Doo Open Discussion
    Replies: 9
    Last Post: 07-08-2005, 11:39 AM
  4. Running solas pitched impellor with stock rubber cone
    By bling bling in forum 4-Tec Performance
    Replies: 24
    Last Post: 06-29-2005, 03:54 PM
  5. IS this tooo CRAZY ???? possible meet of us & our RXPs
    By CRAZEDRXP in forum 4-Tec Performance
    Replies: 20
    Last Post: 05-09-2005, 08:48 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
  •