91 Gt Daily... Mid 12's

Discussion in 'Fox 5.0 Mustang Tech' started by sen2two, Jul 18, 2013.


  1. David Pepiton

    David Pepiton Active Member

    Joined:
    Dec 18, 2011
    Messages:
    678
    Likes Received:
    71
    Trophy Points:
    49
    Location:
    Laveen, Arizona
    I think some tuning is what's needed not throwing parts at the car. after you map out your a/f ratio you can determine where you need to add if you even need to. but I've found that stock heads like that dont make power at the higher rpms and that may be your issue your experiencing.
    #21
  2. clement

    clement Founding Member

    Joined:
    Feb 27, 2001
    Messages:
    1,107
    Likes Received:
    51
    Trophy Points:
    49
    Location:
    Oak Cliff
    IIRC 38-39 psi without manifold vacuum on the regulator. so pull the vacuum line.
    #22
  3. sen2two

    sen2two Active Member

    Joined:
    Jul 18, 2013
    Messages:
    169
    Likes Received:
    6
    Trophy Points:
    29
    i just finished cleaning the engine bay to check over everything. and i found it has a bbk fuel pressure power plus regulator and gauge. sweet...

    should i pull the vacuum line off the bbk regulator as well to get the correct reading on the gauge?
    #23
  4. TOOLOW91

    TOOLOW91 Mustang Master

    Joined:
    Nov 30, 1999
    Messages:
    2,615
    Likes Received:
    752
    Trophy Points:
    144
    Location:
    S.I.NY
    yes you should to check and change it then reinstall the vac , ill bet it's leaning out due to the injector and meter Mis match


    Sent from my iPhone using my fingers
    #24
  5. sen2two

    sen2two Active Member

    Joined:
    Jul 18, 2013
    Messages:
    169
    Likes Received:
    6
    Trophy Points:
    29
    the injectors and maf are stock.
    #25
  6. sen2two

    sen2two Active Member

    Joined:
    Jul 18, 2013
    Messages:
    169
    Likes Received:
    6
    Trophy Points:
    29
    fuel pressure is at 42-43psi with the vacuum line disconnected from the bbk fuel pressure regulator. And at 39psi with the vacuum connected.

    i guess thats a little high which could be the cause of the break up. but i will leave it there until i put a wideband on it to make sure.
    #26
  7. 1200gt

    1200gt Member

    Joined:
    Nov 30, 1999
    Messages:
    305
    Likes Received:
    21
    Trophy Points:
    19
    #27
  8. Sharad

    Sharad ALWAYS choose the V over the P!!! Wait... what? Site Sponsor

    Joined:
    Jan 5, 2011
    Messages:
    1,388
    Showcase:
    1
    Likes Received:
    331
    Trophy Points:
    94
    Location:
    Fort Myers, Florida
    ...threw em away... :oops:
    #28

Share This Page