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    Thread: Boosting 25 psi WHY!!!!

    1. Member
      Join Date
      Jun 24th, 2009
      Location
      Royal Oak, MI
      Posts
      128
      Vehicles
      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
      Location
      Buffalo, NY: Last call 4AM!
      Posts
      939
      Vehicles
      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
      Join Date
      Jun 24th, 2009
      Location
      Royal Oak, MI
      Posts
      128
      Vehicles
      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
      Join Date
      Jun 24th, 2009
      Location
      Royal Oak, MI
      Posts
      128
      Vehicles
      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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