Worth Another SHot

Discussion in 'Technical' started by Samo18, Feb 10, 2007.

  1. Samo18

    Samo18 member

    Hey guys, ive put this up ages ago but just wanna re-cap.
    Currently my car is running on 5psi, and i dont know y, very broad but ne ideas?

    O2 sensors are disconnected atm coz 1 of them is faulty, ummmm i have after marker bov's, twin TRUST intercoolers. and i have done a boost leak test only 2 find nothing.

    Hopefully tak it 2 Zed4Life soon, if he has time ;)
     
  2. 90TTZ

    90TTZ Back From The Dead

    Could be a couple of things but here is something you can try but be very careful.

    Assuming you still have the stock boost control system, where the 6mm boost hoses run from the hardpipes that come off the intercoolers to the wastegate actuators, disconnect these hoses and plug the hard pipes with something, little bit of hose folded over with a cable tie works great. What you have done is taken the supply pressure from the wastegate actuators so providing there is nothing wrong with them, the turbo's will keep boosting until your motor explodes or you let your foot off the throttle.

    As I said be very careful. You should only need to give the throttle a quick stab. The best and safest situation to do this is by getting to around 60K/hr and hold (lock it if it's auto) in second gear, then give WOT and watch the boost gauge. If it climbs over 5 PSI quite easily, by the time you release your foot it should not have built up boost past 10PSI and the BOV's would have opened and released the pressure.

    If this works then there is a problem with the safety boost solenoids or they a disconnected. If this does not work then the waste gate actuators are shagged.

    If you have an EBC or MBC, then you can do the same procedure, just disconnect and plug the supply pressure hose to the controller.
     
  3. Samo18

    Samo18 member

    hmmm

    i could b wrong but im pretty sure the wastegate actuators are missing.... it think thats what they are, ill post a pic soon.
     
  4. 90TTZ

    90TTZ Back From The Dead

    If the wastegate actuators were missing, the wastegate would be flapping the exhaust breeze. I think you may have it mixed up with the safety boost solenoids.

    If the safety boost solenoids are missing and the wastegate boost hoses are plumbed to the factory positions, then this is definitely why you have such low boost. Although most would argue that safety boost is 7 PSI, when you have such an old car anything is possible.
     
  5. Samo18

    Samo18 member

    Here is a pic of what is missing

    ok so i went looking for the reason only to find this missing
    [​IMG]

    the GREEN lines are mine. A- is the piece that is missing, B- that is a vacum line that has been cut an has a screw in the end of it

    Same on both side of engine.
     
  6. 90TTZ

    90TTZ Back From The Dead

    Yep, A is the safety boost solenoid. With that removed it is not possible to restrict the boost pressure by diverting the pressure through the factory boost jet which allows 9PSI.

    I would say at some stage somebody had a boost controller installed, most likely an electronic type and has removed it before they sold it to you.

    Easiest way to get your boost up is to insert a mig welding tip into the end of each hose where it connects onto the hard pipes, available at any welding shop and a packet of 5 is about $5-$10. Ask for a 1.2mm tip whichshould give you around 11PSI. Not much point warning you that the safety boost system will no longer work as the solenoids are not even there.

    Happy Boosting :)

    Edit: Not quite correct with my first statement. If you look at the picture of the safety boost solenoid, it has a hose that goes from the suction side of the turbo to the solenoid. When the solenoid is energised, it allows this vacuum to slightly counteract the pressure coming in from the supply side to hold the wastegates shut a little more. When there is no power to the solenoids which is switched by the ECU (on detecting knock for example), it cuts this vacuum and allows full pressure to reach the actuators, allowing it to open the wastegates as early as possible and robbing you of your fun ;)
     
    Last edited: Feb 10, 2007
  7. Samo18

    Samo18 member

    Welding Tips

    u wouldnt believe it, i have welding tips in there, atm there .9mm and still nothing, didnt make a bit of difference, can u post pic of which pipe they should b in?
     
  8. 90TTZ

    90TTZ Back From The Dead

    Get a torch and follow the hose from the wastegate actuator on the passenger side, it should connect to the steel pipe that the rubber hoses join to the throttle bodies.

    Also, these hoses are the only ones that are 6mm, the others are 4mm.
     
  9. Samo18

    Samo18 member

    Thanks

    thanks for ya help man, but unfortunately i have no idea what im talking about, so got no idea what u mean. ahahhaa. total newb. will just have 2 let someone look at it i think.
     
  10. 90TTZ

    90TTZ Back From The Dead

    Ha, no worries bud but your issue is simplier than you think. You have already posted a photo of that side of the engine so you know what to look for. Just find the wastegate actuator on the passenger side, you can see it from looking down beside the battery. Then follow this hose and tell me where it goes. Can you post of photo of where you found the welding tips?

    Also, although they may say they are .9mm, they may have been drilled out much larger.
     
  11. Samo18

    Samo18 member

    Welding Tips

    good morning,

    in the pic below i have show with GREEN arrows which vaccum line the welding tips are in, the silver clamp u see is 2 hold it in place.
    Is this the right vacum line?
    [​IMG]
     
  12. zed4life (zedcare.com)

    zed4life (zedcare.com) Ω vicarious zedder Ω

    R33K had this same problem. The problem

    is that with or without boost jets, you won't get more than safety boost without the factory solenoid setup. This has been discussed at great lengths just recently.

    Karl is right in saying that the previous owner has had an electronic boost controller in there at some time.

    The ONLY way to get the desired 9PSI+ boost is to:
    • Use an electronic boost controller or
    • restore the factory setup with the solenoids and hoses etc...

      boost jets or manual boost controllers etc all will fail without the factory wastgate solenoid setup.

      The reason an electronic boost controller works (where boost jets don't) is because it can trick the wastegate into opening later by limiting the amount of pressure to the wastegates. Boost jets can not provide this precise level of control...

      An electronic controller will cost you several hundred. Labour to re-install the factory solenoids will cost you similar. If you want to reinstate the factory setup it would make sense to do a plenum pull at the same time (which makes getting to the solenoids so much easier) and eliminate many other potential problems...

     
  13. Samo18

    Samo18 member

    Thanks Mark

    a few hundred dollars, that sucks ahaha. i think i will go with a electronic boost controller, anyone in the brisbane area a wiz at installing them?

    And are there ne good suggestions for a electronic boost controller?

    OOOORRRRR does anyone in the brisbane area have 1 sitting around that i could try an make sure it fixes my problem?

    Thanks for all the help guys
    Sam
     
  14. 90TTZ

    90TTZ Back From The Dead

    Not quite true. I have removed a set of safety boost solenoids and installed a Simark MBC and it would control boost accurately all day long. When you think about it, the only thing that can open wastegates actuators is pressure. Restrict or limit the amount of pressure that the actuators recieve and the distance they travel will be less.

    I bet welding tips (boost jets) will work the same but if all the hose has been replaced right down to the actuator means the factory boost jet has been removed thus needing an even smaller diameter holed welding tip.

    And yes Samo, the hose you identified is the right one for the passenger side wastegate actuator. The drivers side hose should be in the same spot on the opposite pipe.
     
  15. zed4life (zedcare.com)

    zed4life (zedcare.com) Ω vicarious zedder Ω

    Karl, I thought this true initially also but

    this article explains why boost jet installs fail when the factory wastegate solenoids have been removed.

    The other reason is if the wastegate solenoids are removed then the vac hose that connects to them (which hide the factory set of boost jets) is removed.

    Your MBC might be a good quality one and thus works but boost jets won't unless they were a very small internal diameter. I don't think boost jets (which are welding tips) come in sizes small enough to compensate for Sam's problem.

     
  16. ZDUCTIV

    ZDUCTIV Active Member

    Blitz ID-III
     
  17. 90TTZ

    90TTZ Back From The Dead

    Yep agree with you there Mark. Because of the factory boost jet being removed you would need a small welding tip. The Simark MBC I know does the trick, they are now marketed as a JRD boost controller on ebay here.

    $30 posted.
     
  18. Samo18

    Samo18 member

    Apexi AVC-R

    hey guys, thinkin bout getting the Apexi AVC-R boost controller, neone got one an know if there ne good, they sounds ok.

    And mark can i take to u for installation?

    Thanks
     
  19. 90TTZ

    90TTZ Back From The Dead

    I have one and it works great.

    [​IMG]
     
  20. DrewZ

    DrewZ member

    A question about MBC

    http://cgi.ebay.com.au/JRD-Boost-Co...7QQihZ014QQcategoryZ43808QQrdZ1QQcmdZViewItem
    How hard are these to install in TT zed? And you need two of them correct? Ive had a bit of a read in the tech section. If you need one for each turbo you would have to be carefull to adjust each one the same, sorry for the dumb question I'm still learning how everything works:confused: . I'd like a EBC but can't afford one atm, these MBC's look good for the price. Some more insight from someone who knows would be great.
    Cheers
     

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