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Thread: Boosting 25 psi WHY!!!!

  1. Member
    Join Date
    Jun 24th, 2009
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    Royal Oak, MI
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    2001 Audi TT 225Q & 2005 GLI 20th
    04-07-2012 12:49 PM #1
    BOOSTING 35 PSI!!!!!!!

    2001 225q

    The car runs and drives fine but it seems more sluggish than i remember. I removed the N249, EVAP, SAI, COMBI and PCV. STILL HAS the N75 i believe(the solenoid on the TIP) I thought this was the boost controlling solenoid. Do I need to use a MBC instead?

    only upgrades are eurosport TIP and k&n filter on the maf.

    my vac lines go from intake mani -> to fpr ->to DV

    From the turbo it goes to one side of the solenoid on the TIP, from the other side of that solenoid it goes to the charge pipe

    CE codes pulled on regular scanner:
    P1426
    P1432
    P1287

    So far I have tried:
    n75 unplugged = 12-14psi
    n75 plugged in = 35-37psi

    The only possibilities would be DV, N75 valve, or wastegate i think.
    Last edited by das GLI; 04-07-2012 at 05:46 PM. Reason: Troubleshooting results

  2. Member lite1979's Avatar
    Join Date
    Sep 8th, 2005
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    Buffalo, NY: Last call 4AM!
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    2001 Audi TT 225 QC
    04-07-2012 03:59 PM #2
    I found your problem:

    Quote Originally Posted by das GLI View Post
    2001 225q

    I removed the all the emissions
    Seriously, though, you need to say exactly what you removed, why you did so, and how you worked around not having each part. There's no way for us to know exactly what's wrong with your car based on this information. Did you remove the catalytic converter and 02 sensors? Because that has to do with emissions. Did you get rid of the Secondary Air Intake Pump? That's emissions-related. Did you block the plate for the EGR valve and remove that, too?

    And are you boosting to 25 or 35 psi now? The title says 25; post says 35-37.

  3. Member
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    2001 Audi TT 225Q & 2005 GLI 20th
    04-07-2012 05:52 PM #3
    Meant to put 35 not 25. I cant change the title for some reason. Updated with more details.

  4. 04-07-2012 06:50 PM #4
    Check the boost signal line going to wastegate actuator to see if it's unplugged or has a hole in it. Then, check the N75 to make sure it is not frozen at 100% DC. Also make sure you don't have a wastegate stuck closed.

    All 3 conditions would explain why you are boosting unrestricted (about 35 psi) and it is a dangerous. You most likely don't have enough fuel to supply that much air and the charge is probably heated as hell and all your timing is pulled to save the motor (which would explain why it feels sluggish when high boost pressure should mean more power).

    I would advise that you take care of it ASAP or you will regret it! A $5 ball and spring controller is enough to limit boost to acceptable levels until you get your issues sorted...

  5. Member
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    2001 Audi TT 225Q & 2005 GLI 20th
    04-07-2012 07:38 PM #5
    im going to look into those things and leave the n75 unplugged when i need to drive it.

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