Bypass valve

Discussion in '2005+ Mustang GT 4.6L Tech' started by Jcg_3v94, Sep 15, 2020.

  1. Jcg_3v94

    Jcg_3v94 Member

    77
    1
    How can i properly test my bypass valve?


    Sent from my iPhone using Tapatalk
     
  2. Jcg_3v94

    Jcg_3v94 Member

    77
    1
    Should it be under vacuum while idling?


    Sent from my iPhone using Tapatalk
     
  3. DieHarder

    DieHarder Member

    121
    34
    You can test it for operation using a brake bleeder but that won't necessarily tell you if it's actuating at the correct values. (Not sure what those are for your application). Here's a couple of links that explain how they work and basic testing. The last one is kind of entertaining though very generic.

    https://www.superchargerforums.com/threads/generic-bypass-valve.4636/



     
    Jcg_3v94 likes this.
  4. 07 Boss

    07 Boss Senior Member

    2,809
    251
    I always just pull the vacuum line and see if the the valve closes.
     
    Jcg_3v94 likes this.
  5. Jcg_3v94

    Jcg_3v94 Member

    77
    1
    Im just trying to eliminate reasons on my im pushing only 6 psi when i should be pushing 9psi


    Sent from my iPhone using Tapatalk
     
  6. 07 Boss

    07 Boss Senior Member

    2,809
    251
    What kind of SC and what size pulley? Any other mods to the motor? I'm supposed to run 11-12 psi but run about 10.5 due to mild cams and headers.
     
  7. Jcg_3v94

    Jcg_3v94 Member

    77
    1
    3.4 pulley, saleen supercharger. Only 37lb injectors and saleen cold air intake on motor.


    Sent from my iPhone using Tapatalk
     
  8. golkhl

    golkhl forum member

    1,409
    250
    Belt slip?
     
    Jcg_3v94 likes this.
  9. Jcg_3v94

    Jcg_3v94 Member

    77
    1
    None


    Sent from my iPhone using Tapatalk
     
  10. 07 Boss

    07 Boss Senior Member

    2,809
    251
    Did it used to run 9 psi? How long ago? Did it happen all of a sudden or over a period of time?
     
    Jcg_3v94 likes this.
  11. Jcg_3v94

    Jcg_3v94 Member

    77
    1
    No went from stock pulley to 3.6 to 3.4. Had it tuned and we installed a mechanical boost gauge and only read 6psi had blower services in 2018. Car is all except 3.4 pulley saleen air intake box and injectors


    Sent from my iPhone using Tapatalk
     
  12. 07 Boss

    07 Boss Senior Member

    2,809
    251
    How much boost did it run with the 3.6 pulley? Might be belt slip, what kind of belt tensioner do you run?
     
    Jcg_3v94 likes this.
  13. Jcg_3v94

    Jcg_3v94 Member

    77
    1
    Never checked to be honest. Just the oem belt tensioner.


    Sent from my iPhone using Tapatalk
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.