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General Boost Controller

Posted by spyderdrifter, Jul 18, 2019

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  1. spyderdrifter

    spyderdrifter Freelancer

    Joined Jul 11, 2009
    Fountain, Colorado
    I'm not really sure if this should go here, but it sorta makes sense to me. I just bought Ace Hardware parts to build my own manual boost controller based on this diagram...


    My parts...


    How can I determine how much to shorten my compression spring? I don't want to cut it too much and then make it worthless. Only bought one, should have thought about that and bought several. Same question for the bolt.


    989  2

    1996 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    1K  3

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    1K  5

    1999 Mitsubishi Eclipse N/T
    automatic · 2G DSM
  2. ThunderChild

    ThunderChild Supporting VIP

    Joined Jan 5, 2012
    Rathdrum, Idaho
    Personally I'd have done a straight fitting and tap for the wastegate nipple, instead of a 90* fitting. Aside from that, the bolt can be as long as you want, the springs I'd set up a crude spring pressure tester with a gram scale and find length/pressure that works for you. Or buy more springs and experiment.

    This is another reason why a straight fitting tapped for another npt fitting would be nicer, so you can utilize the longer spring and bolt to its full potential.

    Edit: also, they have the one port labeled as going to the bov, when it should go to the charge pipe directly, either at the compressor cover or j-pipe etc.

    Street Build 298  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    386  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 936  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    Street Build 1K  1

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 2K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM

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