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Thread: boosting issue

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    boosting issue

    Im set up to run 14 pounds of boost on stock turbos. I just replaced the heads,turbos,y-pipe and gutted the cats. I just got the car back yesterday so i have not pushed her hard at all. As i was coming home from the shop and getting on the interstate i gave it some gas and as boost began to build the car just nose dived i guess you could call it. The engine stuttered and acted like it just gave up. My first thought was over boost. My gauge was reading 25 (aftermarket pro-sport) pounds(dont even think 9b's can spike 25 lbs lol). I pulled over immediately and turned the mbc almost all the way down. as i was getting back on the highway i babied her up to speed. in 6th i tried again and same result. this time i heard a loud whistle under the hood. Any ideas... my first thought was a massive boost leak.

    Oh i did replace some things this morning as well. i replaced the rear o-ring on the rear turbo pipe and the vac caps that were dry rotted. This killed the whistle but not stalling during boost

    And 1 thing i did notice is i can ease into boost a little bit but not full throttle.

    Things i have done to car when it went down.
    fairly new 9b's from a jdm engine
    vac reduction
    y-pipe
    gutted cats

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    SKADOOSH!!! verified Feedback Score 1 (100%) J_Parker's Avatar
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    Check your wastegates pressure, do a pressure test on your intake, had you done anything to do with fuel? In the simple mind thoughts I had it sounds a lot like fuel cut?

    Also, what year is your car? check into your TPS, and CAS.
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    no pressure test yet...

    as far as fuel its all stock system. with the boost set at 7 pounds it dont fuel cut as often.

    My mechanic that worked on it to get it running said the same thing a fuel cut.

    tps and cas rings no bells can you explain a little?

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    Forum User Feedback Score 0 ikOnone's Avatar
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    Quote Originally Posted by Ok3skid1 View Post
    tps and cas rings no bells can you explain a little?
    throttle position sensor and cam angle sensor.
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    There will be Blood! verified Feedback Score 4 (100%) CoopKill's Avatar
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    Boost leak classic.

    Help them, for they know not that which they do not know!
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    i turned the boost controller way down. My gauge showed a total of 7 pounds of boost the last time i boosted. Now i cant hold 2 pounds without a bunch of air escaping from some where. It sounds horrible. maybe my blow off valve

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    Spark Blowout..
    Replace coil packs and/or wires or perhaps the PTU..

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    There will be Blood! verified Feedback Score 4 (100%) CoopKill's Avatar
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    Quote Originally Posted by MightyMouse View Post
    Spark Blowout..
    Replace coil packs and/or wires or perhaps the PTU..
    WTF, do you even read what is posted?

    i turned the boost controller way down. My gauge showed a total of 7 pounds of boost the last time i boosted. Now i cant hold 2 pounds without a bunch of air escaping from some where. It sounds horrible. maybe my blow off valve

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    There will be Blood! verified Feedback Score 4 (100%) CoopKill's Avatar
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    You need to get a pressure tester and start finding your leaks. From what you are posting it sounds like it's a major leak at a connection point.

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    Quote Originally Posted by CoopKill View Post
    You need to get a pressure tester and start finding your leaks. From what you are posting it sounds like it's a major leak at a connection point.
    of course i read it... Why would i ask for help and not read anything

    Im in the process of building a pressure tester...

    as far as the ptu and coils both were pulled and tested during the process of putting motor back together from head job. They both tested good but i dont know enough so im not saying there not my problem still.

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