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Boost Gauges

Discussion in 'A4/S4 forum(B5 Chassis)' started by S4_dan, Apr 9, 2006.

  1. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [May 31, 2006]
    Ordered my boost gauge today, ashould be here in next day or so.
    May need some little pointers in fitting the thing!!!!


    Beerzo...you got any pics of your gauge yet please??


    Dan
    #41
  2. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 2, 2006]
    Got my kit today but the fitting instructions are very very basic.

    Where is the best place to connect the gauge hose? i.e., as close to turbo or anywhere on the tube? Which pipe when looking at the engine bay do i need to use??

    is this what i should be looking for on my car? this pic is of a tt engine.


    [​IMG]

    cheers,

    Dan
    #42
  3. Beerzo
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    Beerzo Masa'warty 3200... Talk To Me!

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    [Jun 2, 2006]
    As far as i know its basically an vacume hose after the turbo, but knowing me i will more than likely be wrong.
    #43
  4. Beerzo
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    Beerzo Masa'warty 3200... Talk To Me!

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    [Jun 2, 2006]
    mine is run off one fo the vacume pipes on the intlet manifold. Is this ok?
    #44
  5. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 2, 2006]
    Will have a look again soon, have to go out now, good job ive not started cutting any pipes yet!!!
    #45
  6. Soupie69uk
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    Soupie69uk Owner

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    [Jun 2, 2006]
    Yeah that looks like a fuel pressure regulator which can be used but i would not fancy putting it on that.

    You can take a line off the inlet manifold.
    #46
  7. imported_VaulterTim
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    imported_VaulterTim Guest

    [Jun 2, 2006]
    That line to the FPR comes directly from the manifold (although the connection is out of site there)... check on your own car, you'll see the tube in question at the rear right of the engine (for 1.8T). Most people 'T' off that FPR vacuum pipe for that very reason, just like the guy who's TT engine is in that photo.

    Connecting it at the manifold is the best place for the most accurate reading of boost, if you connect it at the turbo then the reading you get will be slightly higher due to pressure drop across the intercooler(s).

    T
    #47
  8. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 2, 2006]
    is this the pipe?? the one with the neat red lines along it?!
    [​IMG]


    Also, how do i remove the centre vent?take all 3 out or just the centre one?? tried gently pulling but down want to break it!!
    #48
  9. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 2, 2006]
    Have got the middle vent out and gauge fitted. god knows how to and where to feed the pipe through!!!!

    Have given up at the moment. so got gauge fitted but no connections.

    Do i have to remove the whole dash to feed it through???


    Dan
    #49
  10. Soupie69uk
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    Soupie69uk Owner

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    [Jun 2, 2006]
    No you need to drill a small hole in one of the corners of the vent.
    #50
  11. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 2, 2006]
    I put a small hole in the vent housing in the middle where my gauge is seated, but how do i get the tube through the bulkhead??

    Or, how do i get to the bulk head without removing the dash??

    Dan
    #51
  12. imported_VaulterTim
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    imported_VaulterTim Guest

    [Jun 2, 2006]
    [ QUOTE ]
    is this the pipe?? the one with the neat red lines along it?!
    [​IMG]


    Also, how do i remove the centre vent?take all 3 out or just the centre one?? tried gently pulling but down want to break it!!

    [/ QUOTE ]


    Yes that looks like your FPR and vacuum pipe attached to it... looks quite easy to get to but if not (the picture is quite close up) maybe you'd be better off finding a more accesible point in the bay... maybe try to find where it attaches to the manifold... I'm unfamiliar with the S4 engine bay layout so cannot suggest where to look unfortunately.

    Hope that helps...

    T
    #52
  13. imported_VaulterTim
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    imported_VaulterTim Guest

    [Jun 2, 2006]
    [ QUOTE ]
    I put a small hole in the vent housing in the middle where my gauge is seated, but how do i get the tube through the bulkhead??

    Or, how do i get to the bulk head without removing the dash??

    Dan

    [/ QUOTE ]


    Look in the battery box... there will be a large grommet there somewhere used to run cabling etc. through the car... I think there is one behind the ECU IIRC /ubbthreads/images/graemlins/book.gif
    #53
  14. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 3, 2006]
    I have found a gromit from engine bay through the bulk head, but i cant find where it comes into the car??

    Got a feeling im gonna have to remove the dash if i want this connecting up. hoping it would come to this though.

    day off 2day.....well im still on call so it will be just my luck that i have my dash in bits then my alerter will go off.......ggrrrrrr
    #54
  15. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 3, 2006]
    [ QUOTE ]
    Yes that looks like your FPR and vacuum pipe attached to it... looks quite easy to get to but if not (the picture is quite close up) maybe you'd be better off finding a more accesible point in the bay... maybe try to find where it attaches to the manifold... I'm unfamiliar with the S4 engine bay layout so cannot suggest where to look unfortunately.

    Hope that helps...

    T

    [/ QUOTE ]

    yeah sorry about the large pic....nokia mobile phone! it is east access to the fpr and close to the bulk head too. but wil try and get as close as the manifold as poss.
    #55
  16. imported_billybravo
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    imported_billybravo Guest

    [Jun 3, 2006]
    you defo dont want to be pulling your dash out mate just drill a really small hole in the rubber plug in the ECU cover where the wires go then push it hard into the hole and you will have a good water tight seal
    #56
  17. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 3, 2006]
    right,
    got it fed through. i went through some large gromit on nearside, just under the pollen filter.

    connected it between fpr and manifold.

    started car and needle went from 0 to -20 psi.

    thats not right is it? when lightly revving engine it moved closer to the '0'. not bin for a test drive, just putting my glove box back in.

    dan
    #57
  18. imported_VaulterTim
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    imported_VaulterTim Guest

    [Jun 3, 2006]
    That is exactly right... the inlet manifold is under vacuum when the car is idling, i.e. negative boost.

    Take it for a spin and then see what it reads /ubbthreads/images/graemlins/wink.gif

    Job well done it seems... /ubbthreads/images/graemlins/ok.gif
    #58
  19. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 3, 2006]
    Yes, would much prefer a centre blank pod like in one of the pics, but mine will do in the vent form the time being.

    took her for a drive, and as usual she flew.

    on every gear change the gauge went to 10psi the dropped to 7 / 8psi.

    what should the boost psi be on a standard S4??

    Got a feeling my TBB or F hose maybe split due the to pressue drop from 10 to 7/8????

    Cheers for your help guys.

    Very pleased with the results of fitting and having a functional gauge.

    Just concerened a little now! lol

    Dan
    #59
  20. imported_VaulterTim
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    imported_VaulterTim Guest

    [Jun 3, 2006]
    Those figures are fine on a standard car... /ubbthreads/images/graemlins/smile.gif

    When you say it drops off, do you mean at higher engine speeds... 5-6000rpm? If so, that is how it should be. A remapped car will show circa 15psi+ depending on stage of tune... /ubbthreads/images/graemlins/wink.gif
    #60
  21. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 3, 2006]
    Yeah, when the revs to about 5.5k the boost does drop, but initial gear change up then hard on gas, the gauge goes to 10psi then quickly drops to 7 or 8 psi.

    Presuming this is due to the DV recircing and not dumping to the atmosphere??
    #61
  22. imported_VaulterTim
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    imported_VaulterTim Guest

    [Jun 3, 2006]
    [ QUOTE ]
    Presuming this is due to the DV recircing and not dumping to the atmosphere??

    [/ QUOTE ]

    No, the DV only recircs./dumps excess boost back to the intake... i.e. when you lift off the throttle and there is a build-up of pressure against it's spring.

    Boosts drops off at higher revs because it is supposed to... that's the way these turbos are configured (wheel profiles, airflow capability etc.). A larger turbo would provide boost at it's optimum level higher in the car's rev-range but at the expense of a loss of response lower down the rev-range, i.e. turbo lag.

    Hope that helps /ubbthreads/images/graemlins/smile.gif

    T
    #62
  23. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 4, 2006]
    yes it does, cheers. thanks for all or your input. Will post some pics up soon.

    Dan
    #63
  24. imported_VaulterTim
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    imported_VaulterTim Guest

    [Jun 5, 2006]
    You're welcome and yes, pics would be cool /ubbthreads/images/graemlins/smile.gif

    T
    #64
  25. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Jun 5, 2006]
    Here is some pics of my boost gauge.....
    [​IMG]

    [​IMG]

    A bit blurred but....
    [​IMG]

    I'm hoping to get a centre vent pod like one shown in previous photos (madkebab's i think?!)

    I know the colour doesnt match the dash, but now its all fitted I'll match it up later.
    #65

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