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can't set psi

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    #1

    can't set psi

    hey ive been having trouble boosting my car at a set psi. the set up is jdm f22b, dsm t25, dsm manifold, dsm smic...
    my car has been spiking to 15psi so i tried swapping in a new wastegate but now its around 10-11 psi... i have the vacuum source all by itself on the intake manifold...what can i do to keep it at 6-7 psi? thanks
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    #2
    Boost controller? It sounds like its wastegate controlled right now.

    The New-ish Ride
    My old Ride
    Hear my Vtak!!!
    MK3 Member #3
    I piss off people for fun.
    IA 08 Sunburn Victim #1

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      #3
      i think the stock wastegate setting on that turbo is like 7.8psi. The only way to make it lower is to do the actuator mod. Other than the the boost controller isn't going to do a thing. Probably would have been better off without it if u just wanted 6-7psi
      Knowledge is power...in EVERY sense of the word

      FSAE (F Series Accord Enthusiasts) ..."A dying breed thats taking it to the next level" #12

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        #4
        there is no boost controller and im still not able to keep it at 6-7psi

        Comment

          #5
          boost creep
          Shift_BOOST

          BOOM!

          Comment

            #6
            Boost creep is my guess. With that small of a turbo/wastegate on the 2.2dohc its probably overwhelming them with exhaust. Just upgrade to a bigger turbo, problem solved If not, good luck fixing it, 15 psi isn't the best for the stock motor. L8r
            Turbo H23a3 build has begun
            01-01-2019

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              #7
              6th post down on the actuator mod, if you need it..

              http://www.homemadeturbo.com/forum/i...;threadid=2952

              My Old Ride Thread

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                #8
                make sure u dont have an exhuast leak between the turbo/manfold... or manifold/head... this can cause boost spikes.... boost creep would only occurer from a turbine housing too small, or a wastegate too small...
                12.5 at 114.6mph 15psi
                11.7 and 11.5 20.5psi
                F22a1
                60-1 td06h turbo
                Darton mid sleeves
                85.5 wiseco 8.8:1 forged pistons
                Crower pro billet rods
                Custom ported head.
                KMS valves
                F23 headgasket
                ARP H23 headstuds
                H23 upper intake manifold
                F22a6 lower intake manifold
                Intake manifold is gutted
                AEM EMS 1040u
                FIC 850cc injectors
                Walbro 255 pump
                H23 manual trans
                Prelude shifter assembly
                Forbidden short throw
                Nitrous Express Kit installed, never used on this motor

                Comment

                  #9
                  o2 housing needs to be ported, along with a bigger flapper... I experience boost creep also, but only to 10psi... and you have a t25, so that sounds right
                  Shift_BOOST

                  BOOM!

                  Comment

                    #10
                    alright well i have a slight exhaust leak where the downpipe bolts up to the o2 housing... is this something that would add to my boost creep?
                    the vacuum source is off the intake manifold right to the wastegate... i tried keeping it as tight as possible... can i run a vaccuum line to the nipple off the turbo housing itself? does the size of the line matter? Thanks
                    Last edited by PriMal Cb7; 01-23-2006, 01:05 AM.

                    Comment

                      #11
                      Originally posted by PriMal Cb7
                      alright well i have a slight exhaust leak where the downpipe bolts up to the o2 housing... is this something that would add to my boost creep?
                      the vacuum source is off the intake manifold right to the wastegate... i tried keeping it as tight as possible... can i run a vaccuum line to the nipple off the turbo housing itself? does the size of the line matter? Thanks

                      definitely fix that leak. also, you're gonna have to extend that wastegate arm

                      Comment

                        #12
                        try moving the wastegate vaccume line to a source BEFORE the intake manifold, aka the compressor housing. i always got a 1-2psi spike when i had my vaccume line directly into my intake manifold.

                        as midnite said..a boost controller will NOT help you here

                        Owner of https://theclunkerjunker.com

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                          #13
                          quick q, if i just weld where the actuator connects shut, i can just use an external wg and boost controller to solve this, correct? or did i read up wrong?

                          My Old Ride Thread

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                            #14
                            Originally posted by Accord R33
                            try moving the wastegate vaccume line to a source BEFORE the intake manifold, aka the compressor housing. i always got a 1-2psi spike when i had my vaccume line directly into my intake manifold.

                            as midnite said..a boost controller will NOT help you here

                            double that will help you out a lil bit!
                            get that vac. line as close to the compressor as you can, i have a vac. fitting built right into the end of my compressor side...

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