turned up mbc but still holds 13

Posted by jdm9221, Apr 21, 2017

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  1. jdm9221

    jdm9221 Proven Member

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    car is a 97 eclipse gsx got an safc2 yesterday and tuned it to compensate for 19lbs went to hook up the hallman boost controller, got it hooked up and turned it and got nothing. still spikes at 13,i tried hooking it up both ways and no difference. a friend of mine thinks my stock bov wont hold 19 and gave me a new one but it vents to atmosphere and ive heard bad things about doing that. any suggestions help, need the car tommorow
     

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    My DSM:
    1997 Mitsubishi Eclipse GSX

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  2. Jacolu3

    Jacolu3 Proven Member

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    Did you check for boost leaks? Always an important step either way. Might not be the reason but good to know.
     
    My DSM:
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  3. jdm9221

    jdm9221 Proven Member

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    yep finaly tracked down all my leaks. on 16g wastegate presure i held 13lbs steady
     
    My DSM:
    1997 Mitsubishi Eclipse GSX

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    16g   manual
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  4. boostdawd

    boostdawd Proven Member

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    phoenix, Arizona
    What pressure are u trying to run? 19? If so then u need to boost lest test up until 25. Can u verify how the boost controller was connected.
     
    My DSM:
    1991 Eagle Talon TSi AWD

    Drag Race Build

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    1992 Mitsubishi Eclipse GSX

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  5. jdm9221

    jdm9221 Proven Member

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    i spliced the line between my wastegate and intake manifold. same one for my boost gauge and bov. its been tested and no boost leaks
     
    My DSM:
    1997 Mitsubishi Eclipse GSX

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    16g   manual
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  6. Dillan

    Dillan Probationary Member

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    Boise, Idaho
    When you say spikes at 13lbs does it hold the boost steady or drop lower than that if you keep in boost? If so make sure your airfilter is not collapsing.
     
    My DSM:
    1992 Eagle Talon TSi AWD

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    16g   automatic
    1990 Eagle Talon TSi AWD (sold)

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  7. donniekak

    donniekak DSM Wiseman

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    How do you tune an safc for 19psi of boost? It's an airflow signal modifier used to run larger injectors. It has no idea what psi is in the manifold.

    If you are trying to crank up the stock turbo it's going to destroy itself soon.
     
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  8. 91talonts1

    91talonts1 Proven Member

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    Wastegate/boost controller should get it's boost source before the throttle body.

    Your BOV should also have it's own line from the IM for proper performance. If anything tap the boost gauge to the fpr's line. From the sound of it you have all three tied together?
     
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  9. Brembo

    Brembo Proven Member

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    Part it out. haha You doing it wrong. Bov line should be by itself, gauge should be off the fpr line, mbc should be off the manifold or intercooler pipe. Dont listen to your friend.
     
    Last edited: Apr 21, 2017
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  10. doubleclutch

    doubleclutch Supporting Member

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    Canton, Michigan
    Need to drive it tomorrow? undo what you did till you have time to get it right.
     
    My DSM:
    1998 Mitsubishi Eclipse GSX

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    16g   manual
    1996 Mitsubishi Eclipse GST (sold)

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  11. 93AWDDSM

    93AWDDSM Proven Member

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    Lol. What are the mods? Are we still using 450cc injectors? Anything else besides just an Safc?
     
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  12. jdm9221

    jdm9221 Proven Member

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    I copied an safc tune off a friend. He has everything exactly the same as mine except he's on 19lbs. I was just gonna turn mine up and use his tune. I put my boost gauge on my fpr line. Bov is on its own and the boost controller is in between the wastegate and intake manifold but only gets to 14lbs. No boost leaks. I've got 550s walbro 255 16g turbo fmic hallman boost controller and a few other bolt ons
     
    My DSM:
    1997 Mitsubishi Eclipse GSX

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  13. Dsmkauai

    Dsmkauai Proven Member

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    Stock bov are known to leak around 14psi. Have you done a boost leak test yet?
     
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  14. jdm9221

    jdm9221 Proven Member

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    I have a new one but it vents to atmosphere and I heard that's bad idea
     
    My DSM:
    1997 Mitsubishi Eclipse GSX

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  15. jdm9221

    jdm9221 Proven Member

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    Yep. No boost leaks
     
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    1997 Mitsubishi Eclipse GSX

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  16. GST with PSI

    GST with PSI DSM Wiseman

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    Just pull the vacuum line off the wastegate actuator completely...You'll get the "19lbs" you're so desperately seeking.
     
    My DSM:
    1992 Mitsubishi Galant VR-4

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  17. jdm9221

    jdm9221 Proven Member

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    Looking for advice not smart ass comments
     
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  18. Brembo

    Brembo Proven Member

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    Ouch. GstWithPsi is not your average guy. I see his post here and on galant forums, he has a lot of experience with these cars. Sometimes on forums sarcasm comes out wrong way I am sure no one wanted to insult you in anyway.

    Anyways back on track. If your vacuum hoses are all verified then next step I would do is to make sure your wastegate is working properly. You can remove vacuum source or for test perpouse only tighten the flapper with mechanical wire so it won't blow off. Take it for a spin and watch the gauge. Don't overboost and blow it up. If now you are boosting then actuator is bad. If you still not building boost then you need to dig into turbo itself. Drop it inspect it. Also checking for boost leaks is a big one. Many people don't do it correctly. And then they post here about asking for help and in the end it was massive leak.
     
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  19. GST with PSI

    GST with PSI DSM Wiseman

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    My apologies.

    The quicker you blow it up, the quicker you'll realize literally everything you're trying to do is wrong.

    Perhaps you should start your time here by creating a profile so we dont have to guess what's done to your DSM: http://www.dsmtuners.com/threads/welcome-to-dsmtuners-now-go-create-a-dsm-profile.499707/

    I'd also recommend you refrain from taking the that sort of tone in your posts. It won't serve you well here.
     
    My DSM:
    1992 Mitsubishi Galant VR-4

    Street Build

      manual
    1991 Mitsubishi Galant VR-4

    Street Build

    12.030 @ 119.39 MPH
    1990 Mitsubishi Eclipse GST (sold)

    16g   manual
    1991 Mitsubishi Galant VR-4 (sold)

    Street Build

    14b   manual
    1991 Mitsubishi Galant VR-4 (sold)

    16g   manual
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  20. 93AWDDSM

    93AWDDSM Proven Member

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    Really dumb question here but how far is the MBC turned/screwed in? I know when I first put my controller on I backed it completely out and ran around 9lbs. Fast forward, decided to run a tad bit more. I start by turning the knob few times in, multiple times and the boost stayed at 9lbs. I had to have that thing almost completely screwed in to raise my boost levels from 9 to 13-14lbs. Just a thought.
     
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    1992 Eagle Talon TSi

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  21. JackStieben

    JackStieben Proven Member

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    Joined Feb 11, 2014
    San Antonio, Texas
    If it's an eBay 16g, drop the turbo and look inside to see if the waste gate flap is even there. I had that problem twice and I kept kicking myself trying to figure out my boost problems. It would also be helpful if you created a profile for your GSX and include photos of the engine bay and any modifications you know are done to it.
     
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  22. gofer

    gofer Moderator

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    South Gilbert, Arizona
    It's the blow-off valve. Even if you welded the wastegate port closed you'd hit 13psi because the sh**ty plastic 2g bov will open and recirc back to the turbo.

    You can replace it with a 1g, Evo, or aftermarket unit depending on your budget.
     
    My DSM:
    1997 Mitsubishi Eclipse GST

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  23. 93AWDDSM

    93AWDDSM Proven Member

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    Thread question solved? Lol
     
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  24. Brembo

    Brembo Proven Member

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    Clifton, New Jersey
    Just for reference. I check for boost leaks like this:

    1)Remove intake tube and install boost leak tester. If you have MBC then turn it to max boost setting so it won't leak. I have STM Tester with modified hose and regulator.
    2)Determan how much boost you want to run and test it slightly higher. So if if you want 19psi then test it at 25 or close to that.
    3)Introduce the air into the system slowly and go inside the car and see what your boost gauge is reading. Then adjust the regulator until your boost gauge reads desire pressure. When you have done that go to town grab some beer......wrong party.....go get some soppy water and start spraying.
    3)Spray around and listen for leaks. It helps to be in quit area so you can hear the leaks.

    *By the way my shops compressor puts out 250 psi it's easy to blow pipes off if not carefull.
    **Popular leaks are TB seals, Injectors insulators, Bov, Compressor orings, intercooler, jpipe gasket.
    ***My 1g bov was not holding more then 15 psi so I crushed it on the wise while pulling vacuum on it and watching when the shaft cracks open. Calibrated it with hammer. Now it holds 25psi but the drivability defiantly takes a toll. Sometimes if you let off the throttle it jerks but if you learn how to avoid it then it's not a big problem.
    ****I install extra oring on top of the oem new injector seals in order for it to stop leaking. Took few tries to make it stop leaking.
     
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  25. Vegas smith

    Vegas smith Proven Member

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    And how did you check for leaks?
     
    My DSM:
    1993 Eagle Talon TSi AWD

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    16g   manual
    1992 Eagle Talon TSi AWD (sold)

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