Results 1 to 8 of 8
  1. 05-25-2006, 10:45 AM #1
    PiMPNXP
    PiMPNXP is offline
    PiMPNXP's Avatar
    Join Date
    Dec 2005
    Location
    So Cal.....
    Posts
    613

    Impeller tweekers..................

    Ok guys I just purchased the largest Concord (16/21) available for my 155mm pump for my XPL. I am about 100-150rpms OVER my desired rpm. What can I don to fix this? Is there a quick crash couse? How much do I need to tweek the angle to get my desired rpms? Thanks in advance...

    Dan
    Reply With Quote Reply With Quote

  2. 05-25-2006, 10:55 AM #2
    Green Hulk
    Green Hulk is offline
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Location
    Morgan City, LA
    Posts
    38,836
    +1
    3,399
    Dan, look at the thread on prop pitching in the technical section.
    Reply With Quote Reply With Quote
  3. 05-25-2006, 08:43 PM #3
    PiMPNXP
    PiMPNXP is offline
    PiMPNXP's Avatar
    Join Date
    Dec 2005
    Location
    So Cal.....
    Posts
    613
    Thanks will Doo....
    Reply With Quote Reply With Quote
  4. 05-25-2006, 08:57 PM #4
    GTXX
    GTXX is offline
    GTXX's Avatar
    Join Date
    Jan 2006
    Location
    NW, GA
    Posts
    1,776
    drop a nozzle size should do it too and may be the best route since you have a big prop already. what is your desired rpm with a 16/21?
    Reply With Quote Reply With Quote
  5. 05-26-2006, 01:37 PM #5
    PiMPNXP
    PiMPNXP is offline
    PiMPNXP's Avatar
    Join Date
    Dec 2005
    Location
    So Cal.....
    Posts
    613
    GTXX,

    I'm shooting for 7450-7500 rpm single pipe(coffmans)with the repitched 61/21. I have the smallest nozzle I can find 85.5mm. I was about 150 rpms over where I needed to be. I have not really dialed it all the way because the impeller cant hold the engine rpm's back. So If I can get the rpm's down I should pick up some more speed.
    Reply With Quote Reply With Quote
  6. 05-27-2006, 03:18 PM #6
    Hydrotoys
    Hydrotoys is offline
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,742
    +1
    108
    You will. Plus, if you can go LARGER nozzle, and bring your rpms down, there is more bottom end too.

    See what I mean about HAVING to pitch props now???
    Reply With Quote Reply With Quote
  7. 05-30-2006, 01:17 AM #7
    PiMPNXP
    PiMPNXP is offline
    PiMPNXP's Avatar
    Join Date
    Dec 2005
    Location
    So Cal.....
    Posts
    613
    Actually I found a 17/22 Concord that seems to work ok. I found this impeller the day after I picted my 16/21 (kinda sucks).

    How is the yama-Doo coming? Hope to hook up with you guys soon for some riding....
    Reply With Quote Reply With Quote
  8. 05-30-2006, 07:44 AM #8
    Hydrotoys
    Hydrotoys is offline
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,742
    +1
    108
    It's coming nice. The details are overwhelming. Lots of stuff to get right the first time.
    Reply With Quote Reply With Quote
« Riva Stage II+ Numbers For anyone Interested: | Need HELP Please! »

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. which compressor impeller ?
    By eyaliz in forum 4-Tec Performance
    Replies: 8
    Last Post: 05-12-2005, 09:21 AM
  3. Supercharger Impeller Install
    By Teflon in forum 4-Tec Performance
    Replies: 3
    Last Post: 05-09-2005, 06:01 PM
  4. solas impeller wont be in till Monday the stock might.......
    By Jrsrxp in forum 4-Tec Performance
    Replies: 3
    Last Post: 05-06-2005, 02:01 PM
  5. SC impeller
    By shhr in forum 4-Tec Performance
    Replies: 14
    Last Post: 05-02-2005, 09:31 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
  •  

Forum Rules