standard R33 gtst over boosting

Thread in 'Technical Questions' started by philip_200, Oct 16, 2017.

  1. philip_200

    philip_200 New Member

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    as above pretty much standard car, has FMIC but standard turbo,actuator and boost solenoid but once you give it throttle it will overboost and hit fuel cut ive seen it hit 15psi by the time i had let off?

    have changed the actuator still no difference
    also while the actuator was off i checked to make sure the waste gate was opening freely and not seized so theres no reason why the actuator shouldn't be able to open it?

    car is a 1996 spec 1.5 gtst
     
  2. BenRice

    BenRice Well-Known Member

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    No leaks in the vacuum line to the actuator?
     
  3. philip_200

    philip_200 New Member

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    have replaced all the vacuum lines with brand new pipe but will double check in the morning

    r33.
     
  4. dandadude

    dandadude Active Member

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    Double check you haven't accidentally got your vac lines the wrong way around, sounds like you don't have a decent feed to your wastegate any more, either incorrect line or T-piece for boost gauge poss fitted incorrectly, some T-pieces have an orifice and if it's towards the wastegate and not the gauge it's like the wastegate pipe is disconnected!
     
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  5. dandadude

    dandadude Active Member

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    Also try running it without the solenoid so running the line directly from the boost take off to the actuator, it should then just boost to actuator pressure.
     
  6. philip_200

    philip_200 New Member

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    so the vac line from intercooler pipe straight to actuator?
     
  7. dandadude

    dandadude Active Member

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    Yep do that and see what happens, should run at actuator pressure which I can't remember off hand but sure it's less than 15psi on a stock r33

    EDIT - If this makes a difference then re-fit the T-piece and try again.
     
  8. philip_200

    philip_200 New Member

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    will i need to block of the other pipe that goes to the t or just leave it , stock car should be 8 or 9 psi i think
     
  9. BenRice

    BenRice Well-Known Member

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    Yup stock shouldn't be anymore than 9psi.

    Just run a vacuum line from the intercooler pipe to the actuator.

    Block the line going to the recirc valve, I believe that's where your T is going?
     
  10. philip_200

    philip_200 New Member

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    yea thats were t is gong heading down to the yard now so will try this out and see how it goes
     
  11. philip_200

    philip_200 New Member

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    So that worked stayed around 6 psi mark , what does that mean?
     
  12. BenRice

    BenRice Well-Known Member

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    Ok, now hook up the solenoid, but keep the line to the recirc valve blocked and see if it does it

    If it overboosts, factory boost solenoid is bung

    If it doesn't, there was a leak in the recirc line
     
  13. dandadude

    dandadude Active Member

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    Glad that's worked you should be able to work it out doing what BenRice has said which is what I was trying to say in the first place lol.
     

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