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Boostcreep with Pontiac 400 single s475

Discussion in 'Turbo Tech Questions' started by newtoboost, Nov 7, 2015.

  1. newtoboost

    Joined:
    Mar 27, 2011
    I have a boostcreep problem on my Pontiac 400 V8 with headers that have crossover, my 50mm Synapse wastegate is mounted after the merge with a 90 degree angle feeding wastegate pipe, probably the cause of boostscreep. Could a 2nd wastegate mounted on crossover solve problem, would it have to be a identical wastegate? If this is ideal I'd postition crossover wastegate at angle for better flow. trying to control boost down to 8-10 psi, spike to 15psi with small inner spring & hose to open wastegate at lowest pressure. Thanks,
    David
     
    newtoboost, Nov 7, 2015
    #1

  2. M&M Turbochargers

    Joined:
    Jan 31, 2011
    may help you

    wastegateplacement.jpg #ad
     
    M&M Turbochargers, Nov 7, 2015
    #2

  3. Jeremy

    Joined:
    Jun 6, 2005
    Looks like location is not idea for the lower boost level. You could use a second gate of any size on the crossover over to help, just make sure spring pressure is roughly the same and then T the reference line to each gate.
     
    Jeremy, Nov 8, 2015
    #3
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