Page 1 of 2 1 2 LastLast
Results 1 to 10 of 13
  1. #1
    o uncola o's Avatar
    Join Date
    Aug 2008
    Location
    Pittsburgh, PA
    Posts
    1,060

    Another RRFPR question...

    I have a 4-tec with stock internals. Running all stock except for air intake, greenwheel, and external intercooler, and billet fuel rail.

    What is the advantage of running an RRFPR over 40 lb injectors?

    Either one better or worse? Why?

    Any input would really be appreciated.

    Thanks guys.


  2. #2
    o uncola o's Avatar
    Join Date
    Aug 2008
    Location
    Pittsburgh, PA
    Posts
    1,060
    Sorry... meant 42# injectors.

  3. #3
    jpeconsult's Avatar
    Join Date
    Jul 2007
    Location
    Pineville, LA
    Posts
    5,448
    +1
    1
    I don't see an advantage until you add more boost. You should be running OEM injectors on the Greenwheel.

    If you upgrade supercharger, then you will require larger fuel requirements.

    I think you are good as you are.

  4. #4
    o uncola o's Avatar
    Join Date
    Aug 2008
    Location
    Pittsburgh, PA
    Posts
    1,060
    I will also be running an external IC.

    From what I have heard, you need to move up to 42# if you are running greenwheel and external IC... is that not true?

  5. #5
    jpeconsult's Avatar
    Join Date
    Jul 2007
    Location
    Pineville, LA
    Posts
    5,448
    +1
    1
    My ski started its life as a 185 hp (without an intercooler). When I added the XS kit, I didn't upgrade injectors. I didn't upgrade injectors until I added the X supercharger.

  6. #6
    formerly Gold06RXP Turbo Nick's Avatar
    Join Date
    May 2007
    Location
    Dayton, OH
    Posts
    2,095
    +1
    97
    if you have a 127mm upgraded wheel (ex. greenwheel) and external IC you need 42s.

  7. #7
    homebrew's Avatar
    Join Date
    Aug 2008
    Location
    Hampton Va.
    Posts
    556
    with the greenwheel and external cooler you need #42 injectors -- i had that with a 3 " air intake for over a year and it worked fine with nothing else --- but with stock injectors you will be running a bit lean

  8. #8
    o uncola o's Avatar
    Join Date
    Aug 2008
    Location
    Pittsburgh, PA
    Posts
    1,060
    so, no advantage of rrfpr over 42# injectors?

  9. #9
    Moderator Snoman's Avatar
    Join Date
    Apr 2006
    Location
    South Chicagoland
    Posts
    14,688
    +1
    846
    No very little...42s would be the simplest, and way i would go with this setup..

  10. #10
    Banned User
    Join Date
    Dec 2006
    Location
    Crest Hill, IL
    Posts
    9,512
    +1
    215
    Remember, the RRFPR allows you to dump more fuel when needed, not a fixed flow all the time. If you went to a fixed injector size and no RRFPR, the you will be rich down low and maybe lean up top, depending on boost and temps...Makes smaller injectors act BIGGER when needed, then back to normal when not.

    With your setup, use the stock injectors on that rail and you are safe up to an Riva S3 SC. If you can get an A/F reading, you can adjust your RRFPR pressure according...Then if you go to a bigger SC, just swap to larger injectors, drop the pressure a little and start over reading A/F...

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. Another RRFPR stage 3 setup question
    By mstennes in forum 4-Tec Performance
    Replies: 2
    Last Post: 07-30-2009, 07:50 PM
  2. Another Head Question (or 3!)
    By washingtonrider in forum Yamaha PWC Performance (2-stroke)
    Replies: 9
    Last Post: 08-08-2006, 02:24 PM
  3. Another trailer question
    By Piney in forum Sea Doo Open Discussion
    Replies: 7
    Last Post: 06-17-2006, 06:15 PM
  4. Yet another EFI question...
    By Super in forum Yamaha PWC Performance (2-stroke)
    Replies: 17
    Last Post: 06-06-2006, 11:19 AM
  5. another fogging question?
    By Pale Rider in forum Sea Doo Open Discussion
    Replies: 13
    Last Post: 11-10-2005, 05:58 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
  •