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Thread: turbo experts 4agte

  1. #1
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    Default turbo experts 4agte


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    Hey guys i am just wanting to know if this is a big turbo for 4agte. Ive got my t28 turbo hiflow to this and it seems to be very lagging ..I am leaning towards actuator is faulty but i am getting full boost at 6000rpm in 1st 5200rpm in 2nd/3rd so its seems weird when the suppiler rekons i should be full spooling by 4000rpm
    Ive check for leaks and removed my MBC but its still not boosting properly.. I am using a stock 7psi t28 actuator that i put on with not knowing the condition before hand. It opens fine but might be opening under boost pressure to easy ? causing it to lag all the way to high boost

    SO any info is appreciated

    Comp wheel:
    T3 super flow wheel
    48.3 inducer, 60mm exducer, 12 fins 6long 6 short Trim 65


    Turbine:
    65mm TB34 11 fin turbine wheel,
    Internals:

    T04E 360 degree thrust bearing
    Last edited by reecegze; 9th March 2009 at 10:37 PM.

  • #2
    Senior Member dave2221's Avatar
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    ahhh i know the problem....

    need to add more boost.... i think i run about 86psi on my turbo.....

    :p lol

  • #3
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    Hey mate

    How much boost does it get at 6000 rpm?
    What size is the A/R exhaust housing?
    Should be cast on the outside or stamped on the inside.

    To check wastgate diaphram, suck on the hose to it
    then block it with your tongue and check if it holds vacuum.
    If it holds vacuum then adjust the actuator thread so it's
    a bit shorter then test drive. If it gets more boost sooner
    keep winding till it reaches your max boost level.

    See how you go

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    hey mate thanks for your quick reply.. I am only boosting 10psi.. its a .64 housing but hiflow obviously.. What do you mean by that.. stick a hose onto it and block the hose to see if the actuator has a vaccum ? Also this actuator is none adjustable via thread. Should i upgrade to a 14psi actuator ?

  • #5
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    Fit a vacuum hose on the actuator long enough
    for you put it in your mouth, then suck on it to
    create some vacuum then block it with your tongue
    for about a minute. If it pulls vacuum and holds
    it you will know when your tongue gets sucked into the hose.
    If the actuator is faulty it won't suck your tongue into the hose.
    You have to check the actuator first before you go out and buy a new one
    to pinpoint the problem. It could be that the actuator has got enough tension
    on the wastegate flap, is it hard or easy to open the wastegate flap?

  • #6
    Gunner
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    you need to add pressure via the vacuum line, usually by using something like a cooling system pressure tester.

    This way, you can see what the actuator is doing under boost, what happens under vacuum is irrelevant, unless it is a dual diaphragm actuator

  • #7
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    its seems pretty stiff when using hands on the rod to pull it open ill try this tomz thanks mate .. Stressing

  • #8
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    ill nitro test it tomorrow using gauge lines.. I am hoping that its f$cked or i am f@cked for having such a laggy turbo.. Anyone got some insite on the specs of the turbo ???

    Quote Originally Posted by Gunner View Post
    you need to add pressure via the vacuum line, usually by using something like a cooling system pressure tester.

    This way, you can see what the actuator is doing under boost, what happens under vacuum is irrelevant, unless it is a dual diaphragm actuator

  • #9
    Gunner
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    test the actuator, all your cooler pipes, anything boost related, do a comp test, if all is ok with that then take your turbo back to the dude that did it, and tell him it doesn't work.

    As for size, i can't comment. I don't know whats done to it.

  • #10
    Gunner
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    better yet, get a good tune, that might wake it up.

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