Results 1 to 6 of 6
  1. #1
    race24x's Avatar
    Join Date
    May 2007
    Location
    Fayette, Maine
    Posts
    1,005

    afr and rrfpr questions

    So i have an x charger #42 injectors 4" front air intake and i am adding an ext intercooler and rrfpr along with an afr gauge. the questions are can someone give me an idea for base pressure to start with? what am i looking at for an afr reading to be good. high means lean and low means rich correct? the fpr has a locknut and a allen head is clockwise richer or leaner? finally you check base pressure with engine off put dess key on correct?


  2. #2
    rangermtb5's Avatar
    Join Date
    Apr 2008
    Location
    North Jersey
    Posts
    4,473
    +1
    58
    Quote Originally Posted by race24x View Post
    high means lean and low means rich correct? - YES

    the fpr has a locknut and a allen head is clockwise richer or leaner? - Clockwise is richer

    finally you check base pressure with engine off put dess key on correct? - YES
    see above

  3. #3
    race24x's Avatar
    Join Date
    May 2007
    Location
    Fayette, Maine
    Posts
    1,005
    So from searching I think I am going to start at 60 PSI base pressure. What am I looking for in an AFR reading? What should I see and when. I assume I am more concerned about WOT or 3/4 etc?

  4. #4
    stuckmoto's Avatar
    Join Date
    Jun 2010
    Location
    Newark, De
    Posts
    1,485
    +1
    59
    I believe a good start psi is 58-60.
    And a good AFR to shoot for is 12( maybe a little leaner at idle)

  5. #5
    HardmanGT's Avatar
    Join Date
    Aug 2009
    Location
    Rutherfordton, NC
    Posts
    459
    +1
    3
    since you can only control fuel pressure you will want to make sure you are around 11.8-12 at WOT. All other engine speed you will have to live with. They are what they are.

    The only way to tune the AFR at other or all engine speeds is with an additional device, Rude controller, BEGI or Dynojet CMD. A Vtech tune is another option. I run a CMD with Autotune and it works flawlessly.

    I get 14.5 idle, 13.5 mid and 11.8 WOT. My fuel economy is awesome. My buddy used 1/2 tank on his stock RXT yesterday, i used 2 bars

  6. #6
    race24x's Avatar
    Join Date
    May 2007
    Location
    Fayette, Maine
    Posts
    1,005
    Thanks guys I am hoping to get it together for tomorrow, but its fighting me the whole way.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Replies: 9
    Last Post: 11-12-2016, 11:28 PM
  2. afr and rrfpr
    By Sigmarxt in forum 4-Tec Performance
    Replies: 6
    Last Post: 09-29-2012, 10:24 AM
  3. AFR and rrfpr HOW TO INFOS
    By danieletrono in forum 4-Tec Performance
    Replies: 2
    Last Post: 12-26-2011, 07:02 PM
  4. ??? on bad AFR, and RRFPR base setting
    By VX1 in forum 4-Tec Performance
    Replies: 12
    Last Post: 07-05-2011, 06:19 PM
  5. Procedure to initialize RR ECU and Prop question
    By bankyf in forum 4-Tec Performance
    Replies: 8
    Last Post: 05-26-2006, 05:16 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
  •