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Not connected hose on an AGU 20VT

Discussion in 'A3/S3 Forum (8L Chassis)' started by Lazaros, Mar 30, 2012.

  1. Lazaros

    Lazaros New Member

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    Hello guys and congratulations for this reall helpful forum!
    I have a '98 A3 18T / AGU engine and it's remapped by ABT (193ps).
    Recently i noticed something weird on the intake manifold.
    There is a small hose that is not connected on something and it's tapped by a screw :/
    I have no idea what is this,but looks not so normal :)Can somebody tell me what this can be and where should be connected?
    I post two photos,so you will see exactly what i mean.

    Another question is if a N75 J valve could help me for little more boost.Is it ok to switch from my ordinary one?

    Thanks in advance,keep the good work!

    [​IMG]
    [​IMG]
     
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  3. S3featesV9

    S3featesV9 Active Member

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    no pictures mate...
     
  4. Lazaros

    Lazaros New Member

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    sorry.how can i post the pics pls?
     
  5. Alex C

    Alex C Well-Known Member
    VCDS Map User Audi S3

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  6. Lazaros

    Lazaros New Member

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    one sec. I'm fixing the pics :)
     
  7. Lazaros

    Lazaros New Member

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    Here you are

    [​IMG]

    [​IMG]
     
    #6 Lazaros, Mar 30, 2012
    Last edited: Mar 30, 2012
  8. Lazaros

    Lazaros New Member

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    finally i got it with the photos :)
    Any ideas?
     
  9. Prawn

    Prawn My other car is a MINI!!!!

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    That hose should be connected to your DV, unless your DV is plumbed in elsewhere, than you need to get it hooked up again asap. You'll be running effectively without a DV at all at the moment, which isn't good for the turbo.
     
  10. Lazaros

    Lazaros New Member

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    yeah i know.i have lost this lovely "kick".
    It feels totally empty :(
    Can you send me a pic of where exactly should that be connected please ?
     
  11. gregor571

    gregor571 Member

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    Looks like your FPR hose is not connected to the manifold, correct me if wrong...

     
  12. Lazaros

    Lazaros New Member

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    [​IMG]
    [​IMG]

    The things are little complicated or just a mess...
    I took a better look right now and as i could see there's not DV but this black plastic thing that you can't connect something on it !!!
    Only a thicker hose from intake manifold goes on it and then it's plugged on the air flow manager hose.
    What can i do ???
     
  13. Prawn

    Prawn My other car is a MINI!!!!

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    Wow, that's royally bodged, and will be slow as hell! Your diverter valve has been removed and replaced with a bit of pipe.

    You now have in effect NO turbo at all! and a massive 25mm bore boost leak!

    get a diverter valve back in where that bit of pipe is, and plumb the blocked vacuum feed into the small nipple on the DV and you'll gain about 50bhp instantly!
     
  14. Alex C

    Alex C Well-Known Member
    VCDS Map User Audi S3

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    yeah there is no DV there. The black plastic thing you talk of is the hockey puck valve and its for the PVC system, that bits fine.

    just realised thats plumbed right through, why would someone do that?
     
  15. gregor571

    gregor571 Member

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    I have never seen an 1.8t with your pipe config, it is very strange...
     
  16. sportquattro

    sportquattro Active Member

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    As gregor571 says that looks to me like the vac hose for the FPR and should be connected under the manifold
     
  17. Prawn

    Prawn My other car is a MINI!!!!

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    Guys, look at both pics above, it's pretty clear that the old DV hose and the FPR hose cross over creating an illusion.

    the FPR is plumbed in fine, the hose you see capped off is the DV hose, which goes perfectly with the removed DV.

    Sadly, whoever removed the DV should have blanked the two pipes, not joined them. At least that way the car would ahve run fine but had mild compressor stall, not a massive issue if the car isn't mapped.

    What this has done is created a MASSIVE boost leak, and the poor little turbo is probably going nuts trying to make requested load
     
  18. Lazaros

    Lazaros New Member

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    Yes guys,that happened after a reparation because of a crack on the main block.
    I replaced the whole block,but the mechanic (as i can see) was not the best one.
    When i bought the car,it was just amazing and was pulling like hell.
    Anyway...How much a DV costs right now?
     
  19. Metro

    Metro Error

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    OEM dv is under £10 iirc and a forge 007p can be picked up on eBay for £60ish
     
  20. Metro

    Metro Error

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    Infact I have an oem plastic one you can have... Only a year old. Where are you based?
     
  21. Lazaros

    Lazaros New Member

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    I'm living in Sweden mate.I have already ordered one.Thanks anyway :)
     
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  23. Lazaros

    Lazaros New Member

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    I'm living in Sweden mate.I have already ordered one.Thanks anyway :)
     
  24. Metro

    Metro Error

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    haha alright matey, thought id offer, I was going to chuck it away earlier before I saw this thread so thought its better to go to a good home, ill chuck it then :)
     
  25. Lazaros

    Lazaros New Member

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    hahahaha!!!Distance killed the feeling :p Cheers mate!
     

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