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Thread: Bypass valve gone bad???

  1. #1
    Join Date
    Sep 2004
    Location
    Suffolk, VA
    Age
    49
    Posts
    80

    Bypass valve gone bad???

    Just had this happen about two days ago. First i noticed loss of boost pressure so i changed out both the belt and belt tensioner. Still at about 6000 rpm I'm only seeing 4-5psi of boost when the car is set for at least 9.5psi(my normal boost at that rpm) also i've noticed this loud like popping or flapping noise from under the hood while at full throttle, is this the bypass valve doing this? Normal in-town driving if fine, no sluggishness and no noises from under the hood. I have a DR air-to-air vortech s-trim if this info would help or if others out there with this set-up have seen this before. Full throttle, 3psi boost, loud popping on driverside under the hood....

  2. #2
    Join Date
    Jul 2004
    Location
    Bossier City, La
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    85
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    4,439
    I suggest you give Dennis a call. There may be procedures he can advise you to narrow down the possibilities, 1-904-276-5003.

    Regards,

  3. #3
    Another member here told me that these valves go bad after about three years. Mine's still running strong, but apparently he's seen one fail on his father's Vortech-charged Mustang. You can order them directly from Vortech or I'm sure DR can get you one.
    2003 Mercury Marauder
    2007 Lincoln Town Car
    1993 Crown Victoria LX

  4. #4
    Quote Originally Posted by 60sec_assassin View Post
    Just had this happen about two days ago. First i noticed loss of boost pressure so i changed out both the belt and belt tensioner. Still at about 6000 rpm I'm only seeing 4-5psi of boost when the car is set for at least 9.5psi(my normal boost at that rpm) also i've noticed this loud like popping or flapping noise from under the hood while at full throttle, is this the bypass valve doing this? Normal in-town driving if fine, no sluggishness and no noises from under the hood. I have a DR air-to-air vortech s-trim if this info would help or if others out there with this set-up have seen this before. Full throttle, 3psi boost, loud popping on driverside under the hood....


    Call me I will help if I can
    Last edited by Dennis Reinhart; 05-29-2009 at 06:47 AM.

  5. #5
    Join Date
    Nov 2002
    Location
    St. John, IN
    Age
    45
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    14,251
    Quote Originally Posted by Dennis Reinhart View Post
    Call me I have them in stock
    You are not a vendor

  6. #6
    Quote Originally Posted by Zack View Post
    You are not a vendor,

    Yes this is true Zack and edited the post, but people can call me for help especially if they have my kit on the car, and you are no longer a SCT dealer and SCT shut off your dongle. So I understand your frustration. I hope every one has a good weekend in its rained here for ten days.

  7. #7
    Join Date
    Jan 2008
    Location
    Orlando, FL
    Age
    41
    Posts
    641
    LULZ at some responses.

    Valves are like $20 I think... simple swap out.
    -2003 Mercury Marauder 300a-

  8. #8
    Join Date
    Oct 2007
    Location
    CA
    Posts
    525
    What was the problem?? fixed??

  9. #9
    Join Date
    Sep 2004
    Location
    Suffolk, VA
    Age
    49
    Posts
    80
    Changed out the bypass but still no change, same problems...may have to make a trip to Florida to have Dennis look at it.

  10. #10
    Join Date
    Jun 2005
    Location
    long island ny
    Posts
    951
    is your v3 blow through

  11. #11
    Join Date
    Jun 2005
    Location
    East Lansing, MI
    Age
    40
    Posts
    3,528
    belt slip?


    11.90 @ 117.5mph on 93 octane
    324 shortblock, Novi 2000, Now with optional axle removing tires
    Igziabeher

  12. #12
    Join Date
    Jul 2006
    Location
    Garden State
    Age
    55
    Posts
    440
    Sounds like spark blow outs. Bad bypass valve doesn't make loud popping or flapping noise while under WOT.

    How old are your plugs and what are they gapped at?
    2003 Black 300A (SOLD!!!)
    4.6L with Whipple 3.4
    626rwhp 569rwtq
    My Garage

  13. #13
    Join Date
    Apr 2008
    Location
    stayner ontario canada
    Age
    62
    Posts
    546
    check to make sure that all your hoses and pipe clamps are tight

  14. #14
    Join Date
    Sep 2004
    Location
    Suffolk, VA
    Age
    49
    Posts
    80
    Think I've tried all the above so far, changed out all plugs and reverified the gap and traced every inch of hoses and vacuum lines...still same result. I plan to get it back down to Dennis this Friday to see whats going on

  15. #15
    Join Date
    Jul 2006
    Location
    Garden State
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    When you reverified the gap, what were they gapped at?

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