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Need help with my 4g63t sand rail

Posted by Noel gonzalez, Oct 4, 2020

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  1. Noel gonzalez

    Noel gonzalez Probationary Member

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    Hey guys so i just bought this sand rail with a 6 bolt 4g63t that's not running right needs tuning i think it doesnt have the maf sensor i really dont know much about this engines. Is there some one here in Albuquerque that can help with tuning and getting it running right?
     

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  2. Dericsh

    Dericsh Supporting Member

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    I think I see a 1g MAF housing, it is part of the air filter housing you can see in the background of one of the photos.

    Maybe you could try doing a boost leak test?

    cool ride!
     

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  3. lglracer

    lglracer Supporting VIP

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    Sacramento, California
    What ecu is it using? It might have a ECMLink Ecu in it. If that's the case then it is fully tune able. Try opening up the ECU and see whats inside. If not post pictures of it and that will help us.
     

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  4. ThunderChild

    ThunderChild Supporting VIP

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    The MAF is there, second picture where the air filter is, it's housed in there.

    I second a BLT. We will need more info on what it is/is not doing to help with diagnosis. Ecu inspection would be a good idea considering they're susceptible to corrosion and blown caps, and this is in a rather exposed application. A

    compression test it, dirt in the engine will be a major concern, especially with the open PCV vent port near the rad-cap

    Also, not a huge fan of the hot-piped turbo-to-tb setup, any kind of intercooler would be beneficial.

    Cool project though, I bet its alot of fun.
     

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  5. Noel gonzalez

    Noel gonzalez Probationary Member

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    The problem iam having it loses lots of power above 4500 rpm and i get alittle bit of smoke its not blue its got alot of power below 4500 rpm spark plugs were installed yesterday and look black sometimes it dies on me when i go full throttle above 4500 rpm

    Also found this next to the computer
     

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    Last edited by a moderator: Oct 5, 2020
  6. steve

    steve DSM Wiseman

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    That's the diagnostic connector where you would plug in your computer to talk to the ECU. Your ECU pictures show a 1G Early DSMLink installed. Did you get a cable to go with it? If not you'll need a replacement from ECMTuning. (the 1G's DSMLink wasn't cable locked since the interface board was part of the install)
     

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  7. Noel gonzalez

    Noel gonzalez Probationary Member

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    No i didn't get the cable with it the guy i bought it from didnt know anything about it either . Is this the cable i need
     

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  8. steve

    steve DSM Wiseman

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    That should work.
     

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  9. Noel gonzalez

    Noel gonzalez Probationary Member

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    So i just noticed that i have a t in the vaccum line going from the turbo to the waste gate. is this normal?
     

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  10. steve

    steve DSM Wiseman

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    Nothing is going to be "Normal" given that it's a sand rail with a 4G63 in it. :)

    Where does the other end of that line go.

    On an original DSM there was a tap on the compressor side of the turbo that ran to the Boost Control Solenoid and then to the wastegate. There was a restrictor in the line before the wastegate to allow the BCS to reduce the pressure that the wastegate saw effectively raising the boost level of the turbo. A line directly between the turbo outlet and the wastegate sets the boost level to whatever the spring pressure is in the wastegate.


    FSMEGR.jpg
     

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  11. Noel gonzalez

    Noel gonzalez Probationary Member

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    The other end goes to the side of the compressor just like the picture but there is no solenoid just the vacuum hose. Could that be why iam only getting 5 psi?
     
  12. randman2011

    randman2011 Proven Member

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    Indianapolis, Indiana
    I just realized that's the BOV and not the wastegate. No, there absolutely should not be anything teeing off of that. A leak in that line would be hard on your turbo but not cause any performance issues beyond funny sounds.

    However, I do see that there is nothing hooked up to the PCV nipple on the valve cover, which is both not great because it's open to dirty air and not great for any car running MAF like these do.
     
    Last edited: Oct 5, 2020

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  13. Noel gonzalez

    Noel gonzalez Probationary Member

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    So just checked and there is a hole in that broken reducer
     
  14. steve

    steve DSM Wiseman

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    Me too, Looking closer at the picture I see that's actually the Blow Off Valve not the Wastegate and that the BOV isn't recirculated back into the intake.

    The BOV should be connected to one of the ports on the throttle body that has manifold pressure (both vacuum and positive) not the turbo compressor outlet.
    The BOV outlet should be connected back to the intake after the MAF so that air that has been counted and included in fueling calculations isn't dumped causing rich conditions. Those BOV's also leak which doesn't help with tuning.
     

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  15. Noel gonzalez

    Noel gonzalez Probationary Member

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    So the wastegate connects to the t where the bov goes. I am here looking at the turbo and can't find no vacuum port out of the turbo housing
     
    Last edited by a moderator: Oct 5, 2020
  16. steve

    steve DSM Wiseman

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    How about a picture of the Turbo side of the engine.
     

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  17. Noel gonzalez

    Noel gonzalez Probationary Member

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    Here you go
     

    Attached Files:

  18. steve

    steve DSM Wiseman

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    Last edited: Oct 5, 2020

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  19. Noel gonzalez

    Noel gonzalez Probationary Member

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    Yes that goes to the t . So i need that nipple coming out of the compressor connect it to a a boost controller and the other end to the waste gate?
     
  20. steve

    steve DSM Wiseman

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    There are several ways you could set this up.
    Usually it's suggested to make the line between the turbo pressure source and the wastegate as short as possible to reduce any lag in the response that could cause overboosting. Understanding that and lacking any closer port you could use one of the intake manifold ports.

    It's also suggested that the manifold reference for the BOV also be short and directly connected to the intake manifold. There are several ports into the manifold and you should identify them and what they are connected to.

    For example in the third and fourth pictures in your first post there is another vacuum line tee'd to the fuel pressure regulator and some clear tube that runs somewhere else, perhaps a boost gauge. There should be another on the same side closer to the throttle body that is where the BOV is typically connected.

    There are also a couple of ports on the rear of the intake manifold that are currently plugged, the large one used to run to a check valve and was used for a vacuum booster on the brake master.
     

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