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Thread: Bypass valve

  1. #1
    Junior SCH Member
    Join Date
    Feb 2003
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    11

    Bypass valve

    I'm having bucking issues at light throttle because my small bypass valve is not big enough.

    What is the best bypass valve that is big enough to stop the bucking issues I'm having?
    2002 GT Auto
    Vortech Polish SQ-Trim
    AFM Power Pipe
    90mm LMAF
    42lbs Injectors
    Chicane Sport Fuel Pump 255lph
    Fast Track Air to Air Intercooler
    FRPP 3.73 Gears
    FRPP 70mm TB
    Magnaflow Catted X-Pipe
    Magnaflow Catback
    Steeda Upper & Lower Control Arms
    Steeda Subframe Connectors with Cross Braces
    Steeda Wing
    Steeda Ultra Lite 17X9
    Auto Meter Lunar Gauge Cluster
    Auto Meter Boost & Trans Temp Gauges
    Cobra Front Bumper

  2. #2
    Senior SCH Member
    Join Date
    Dec 2002
    Posts
    167
    what kind of bucking issues are you having? are they on decelaration?

  3. #3
    Junior SCH Member
    Join Date
    Feb 2003
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    11
    on decelaration and light throttle cruising

  4. #4
    Junior SCH Member SteedaStud's Avatar
    Join Date
    Jan 2004
    Location
    NC
    Posts
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    I have same issue. Steeda said that it's caused by the larger injectors being less precise at low speeds. The guy was in sales, not tech, so take it for what it's worth.
    I've gotten used to it and just disengage the clutch at the first symptom, though that doesn't help you, having an automatic.
    If anyone else has any thoughts on this issue, I'd appreciate your comments.
    03 Mustang GT Steeda Level III
    Steeda Badge #2003-007
    Vortec V2-SQ

  5. #5
    SCH Member
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    Dec 2003
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    92
    what do i need to get in order to get more boost out of my sq?

  6. #6
    Junior SCH Member SteedaStud's Avatar
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    Jan 2004
    Location
    NC
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    Quote Originally Posted by CobraVnmn
    what do i need to get in order to get more boost out of my sq?
    I recently bought a 3" pulley to replace the 3.6 on my V2SQ to go from 6-8psi to 9-11, then decided to wait until I get a forged shortblock, as several references stated that the GT's 4.6 2V's pistons won't take the added boost. Maybe I'll do a used 03' cobra block and crank (karkraft.com) with forged or billet rods and pistons @ 8.5 compression, or perhaps one of the new 5.0L stroker modular shortblocks to get more torque. With the V2SQ being centrifugal and so not kicking in till 2500rpm or so, torque at very low rpm (like 5th gear) sucks.
    03 Mustang GT Steeda Level III
    Steeda Badge #2003-007
    Vortec V2-SQ

  7. #7
    SCH Member
    Join Date
    Dec 2003
    Posts
    92
    The bucking I believe has nothing to do with ur bypass valve, I believe the bucking issues come from your cam..

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