7a-turbo and A/C question

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  • aesthetics
    S2Forum Fanatic
    • Jun 2008
    • 83
    • Country: United States

    #1

    7a-turbo and A/C question

    I will be turboing my 7A very soon....well its actually a 7A block with a 3b head(even though 7A and 3B heads are the same except for water manifold). The block has about 100k miles on it, and I will be rebuilding the head with new valves, springs, and lifters. I am basically doing a 3b conversion...staying with the dizzy, and basically making my 7A look like a 3b.

    Ok, so this is the main thing to keep in mind, I only want to get ~300bhp.

    So knowign this, I will be sticking with 034s CR dropping head gasket. Since the block only has 100k on it, the bottom end should be very strong and definitely reliable. I will most likely be using a stock k24 and manifold. I know that 300bhp is about the limit for this manifold and turbo, so anywhere around 300bhp is plenty for me. I really only have 2 main questions......

    (1)But, one of my first questions regards the turbo. Since I will be basically maxing out my turbo.....is this not so much of a good idea to do so? I will be taking my coupe down to school(10 hours away) and will use it for my daily driver. Would it maybe be a better precaution to source a better k26-flange turbo which can handle more than 300hp? That way, since I do not really want more than 300hp, I really won't be stressing the tirbo too much. Any insight on this is greatly appreciated.



    (2)I will be using a stock WG, stock manifold and 3" 034 DP, and k26 flange turbo....so this means everythign will be in the stock placement as any 3b,aby, or adu engine. One of the few differences between the 7a block and the 3b is the arrangement of the A/C compressor and the Alternator. On a 7A, the A/C compressor is on the exhaust manifold side and the alternator is on the radiator side. On a 3b, it is the exact opposite. So knowing this, I figure that I should not have any fitment issues at all. But just from reading around, I hear some people say the A/C compressor gets in the way...but some people say it really doesnt. I know that the A/C accummulator(or condensor....LMAO i forget what the name is for that cylindrical shaped thing) sits in the far front corner of the exhaust side...so maybe those hard lines get in the way of the turbo assembly. I would like to use a stock 3b oil cooler, and a stock 3b intercooler+Xmember. So the main question is, what will be my fitment issues? Of course I will never truley know the specifics until I drop the motor in and start assembling...but its always good to know as much as possible before hand. I really do not want to delete my A/C...and going to school in North Carolina means that I will need my A/C. So there is no option to get rid of the A/C.

    At this point in my project, these are really the only 2 things bugging me right now and I would love to hear some opinions/ideas/concerns, etc.

    Thanks in advance!!!
    -1990 7A coupe (US)
    *s2 front end with rs2 headlights.
    *Fiber Images CF hood.
    *5 lug converted (s2 front, early a4 12v rear).
    *993 TT front calipers, rs2 brackets, SS lines, A8 323mm rotors ,and Ferodo DS2500 Club Race pads.
    *H&R springs with Bilstein HD shocks and green HD strut mounts.
    *Another 7A on the stand almost ready for boost


    -1991 3B 200 20v Avant (US)
    *Ben Swann Chip www.gtq.com
    *Boge Turbo Gas struts
  • mcandmar
    S2Forum Zealot
    • Apr 2004
    • 5118
    • Country: Ireland

    #2
    3B/ABY/7A all have the AC/ALT units in the same locations, your confusing them with the AAN which mounts the AC and ALT differently

    Mark.
    91CQ20v - Gone to a new home
    93UR-S4 - The Magic Carpet
    94S2Bus - The Emerald Express

    Comment

    • mikeraz1
      S2Forum Addict
      • Jun 2008
      • 342
      • Home: Scotland Current: United Kingdom

      #3
      I'd like to hear how you get on with fitting a turbo to the 7A and getting 300bhp. I'd like to do the same but a bit short of money at the moment.

      Comment

      • aesthetics
        S2Forum Fanatic
        • Jun 2008
        • 83
        • Country: United States

        #4
        Originally posted by mcandmar
        3B/ABY/7A all have the AC/ALT units in the same locations, your confusing them with the AAN which mounts the AC and ALT differently

        Mark.
        now that I think about it, is your car RHD? Maybe it is different the way with euro cars. Heres a pic of my baby when I first got it and undressed it for the first time quicky.

        And I know that USDM 3b motors are the opposite because my 200 20v avant is a 3b and it is the opposite.

        Either way, the 200 engine bay is much bigger than the coupes. But i am not correct for sure but is the 20vt typ 89 bodies AC accummultor which has 2 hard lines going to and from the AC compressor inbetween the chassis and front right fender?

        I am technically building a 3b motor with 7A pistons...or at least that is how I look at it. The head already has the water machining and the block will get it's oil hole once I am back from Europe. I will just reduce the CR via head gasket and slap on a k26 manifold with a k24 turbo. And I have the same chassis as a LHD typ 89 so I can source an A/C assembly since EVERYBODY THROWS THEM OUT(one thing i love to see is when we have a beautiful coupe thats nice and fast.........with A/C aahhhhh i love cool air when its hot LMAO)

        If anybody has engine bay shots which could resemble what I am trying to build it would help me sketch things out.
        Attached Files
        -1990 7A coupe (US)
        *s2 front end with rs2 headlights.
        *Fiber Images CF hood.
        *5 lug converted (s2 front, early a4 12v rear).
        *993 TT front calipers, rs2 brackets, SS lines, A8 323mm rotors ,and Ferodo DS2500 Club Race pads.
        *H&R springs with Bilstein HD shocks and green HD strut mounts.
        *Another 7A on the stand almost ready for boost


        -1991 3B 200 20v Avant (US)
        *Ben Swann Chip www.gtq.com
        *Boge Turbo Gas struts

        Comment

        • aesthetics
          S2Forum Fanatic
          • Jun 2008
          • 83
          • Country: United States

          #5
          Originally posted by mikeraz1
          I'd like to hear how you get on with fitting a turbo to the 7A and getting 300bhp. I'd like to do the same but a bit short of money at the moment.
          haha i hear u about being short on money....but my basic plan is to resemble a chipped 3B.

          -k24 turbo
          -kkk flange OEM manifold
          -wastegate
          -DP
          -stack gaskets or get 034s gasket
          -xmember with intercooler
          -nice injectors(I got a nice set of 42lb high impedence injectors slightly used for $200)
          -fuel rail
          -fuel lines, water lines, and oil lines.
          -water manifold with machining
          -oil hole drilled in block
          -either a 3b motronic system or megasquirt....with the OEM software, I would do a nice little GTQ chip(http://www.gtquattro.com/qlcc.html)
          -stiffer wastegate spring
          -nice BPV....basically some sort of recirculation system as long as it isnt crazy crazy loud, but that depends on what you prefer.
          -a wire harness for whatever computer you chose to use. a 3b harness works just fine
          -metal dizzy gear
          -s2 oil cooler
          -all the necessary bolts, fittings, gaskets
          -relocate the battery
          -maybe delete aux radiator depending on how everything fits.
          -and now in my case, the situation with mounting the alternator on the radiator side...and adopting a 3b typ 89 AC system.


          What do you guys think?

          that sounds about right i think....but feel free to add anything
          -1990 7A coupe (US)
          *s2 front end with rs2 headlights.
          *Fiber Images CF hood.
          *5 lug converted (s2 front, early a4 12v rear).
          *993 TT front calipers, rs2 brackets, SS lines, A8 323mm rotors ,and Ferodo DS2500 Club Race pads.
          *H&R springs with Bilstein HD shocks and green HD strut mounts.
          *Another 7A on the stand almost ready for boost


          -1991 3B 200 20v Avant (US)
          *Ben Swann Chip www.gtq.com
          *Boge Turbo Gas struts

          Comment

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