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2G Single & dual stage MBC not working after rebuild

Posted by Jcoylesr76, Nov 23, 2020

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  1. Jcoylesr76

    Jcoylesr76 Probationary Member

    Joined Apr 8, 2019
    Athens, Pennsylvania
    ETA: unless I am mistaken and stock psi on waste gate is 14-15psi?

    Having issues with boost control, car was recently fully rebuilt, old MBC was funked up so I picked up a turbo smart dual stage, and no matter what I do it's still hitting 15psi. Info i got was 9-11psi on stock wastegate for this turbo? And help would be appreciated, some info below. Thanks.

    EvoIII 16g
    255 walbro
    550cc injectors
    Punishment racing FMIC & piping 2.5"
    Injen intake
    Black box ECU/Tactrix tune.

    Manley forged crank
    Turbo tuff rods
    Manley stock size/comp pistons
    All new bearings
    Balance shaft deleted
    Fadenza flywheel
    CC stage 4 6 puck clutch and pressure plate
    OEM TOB.

    Crower SS valves, strings, retainers, and titanium tops
    GSC 268/268 cams
    New valves seals, rings, and gaskets, etc
    Kingly HLA
    Last edited: Nov 23, 2020
  2. steve

    steve DSM Wiseman

    Joined Feb 3, 2002
    Boulder, Colorado
    I get that you're hitting 15 psi boost but what's the issue, you want it to go higher or lower?
    What are you using to control the boost and how is it attached?

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  3. delta448

    delta448 DSM Wiseman

    Joined Jan 13, 2006
    Clarksburg, West Virginia
    I've not encountered an Evo 3 16g with an internal wastegate actuator set for less than 14psi. The stock t25, on the other hand fully extends around 10ish in my experience. An Evo 3 16g is just getting started at 10psi, most wouldn't want an actuator that low opening on a 16g.

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