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VW Bora Custom Fibreglass subwoofer build. (large photo content)

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  • VW Bora Custom Fibreglass subwoofer build. (large photo content)

    Hey folks, I have recently completed my sub for my Bora V5.

    Basicly the mrs said that i wasnt allowed a sub because there would be no boot space left (lol)
    so after a little research i came across somebody else who had done this type of install on a bora.

    I followed their guide this is a pictorial story of how i went about it.

    What you need :

    3sqm fiberglass matting
    1sqm fiberglass cloth
    3lt fiberglass resin (and hardener)
    measuring cup
    lots of cheap paint brushes
    Lots o|:
    f masking tape
    +-*P/lastic drop sheets
    some 19mm mdf
    some "grip bond" adhesive (or similar)
    pva glue
    some contact adhesive
    car carpet

    10" (low profile if possible)

    Tools used
    Stanley knife
    Multi cutter (ie renovator)

    Ok first thing first. you cannot spend enough time taping up the area to glass, and plastic sheet the boot. Trust me you DONT want to get this **** on your carpet.

    Remove the cargo netting thing. (tried to carefully remove without breaking, but in the end proved impossible.)




    I found that putting the rear seats down and physicaly getting into the boot was the easiest way to make sure i was getting access to all the hard to reach bits,


    Mark roughly the shape of the sub
    VERY IMPORTANT STEP Lightly spray some oil onto area you are going to be woring on - i used some low calorie olive oil as i said a VERY light spray. Prep by cutting your fg into strips (2inch x10) this mkes life alot easier when applying the FG

    So start building your layers of FG up, use your paintbrush to 'stipple' the resin into the FG, mking sure you remove all the bubbles.

    Make sure you bring your FG at least 2-3 inches over the line (find out later why)

    Once you have 3 layers or FG mat (with 24 hours of drying between coats) you can pull the mould from the car. This wasnt too easy but after 10 mins or so of freeing off and pulling it came away.

    The next thing i did was use a multi tool to clean up the inside, to mke it as neat as poss. I then put 2 layers of FG Cloth as a final coat.
    After this it came to the point i was dreading. The cutting of the FG. It became apparent that the lines i had origonaly drawn were a mile out (i was glad i had gone a few inches over the line.)

    A nice flat surface helps at this stage.

    Mark round the sub then trim to suit
    Test fit

    decided to fit som 8mm foam to the rear of the enclosure to minimise vibrations

    Mark out and cut speaker and port holes. I then pva glued all cut edges.

    Got some proper audio speaker filler from jaycar

    At this point i ran a thin bead of no nails adhesive round the inside of the enclosure and round the edge of the mdf, sat in place and used a scraper to fill in any gaps. left for 72 hours to dry (it actually to that long to go rock hard)

    ]

    Rough build time 25hours
    Last edited by Hairy_mic; 29-04-2013, 01:17 AM.
    2004 VW Bora v5 Auto

    Hairy_mic' custom audio build http://www.vwwatercooled.com.au/foru...ent-85117.html

  • #2
    good work !!! looks great !!
    VW BORA 2003 V6 4Motion
    Volkswagen Golf MK3 1997 CL 1.8L

    Rammstien + Autobahn + Volkswagen = Leben !

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    • #3
      Looking Good. Does the fibreglass attach to the MDF some how ?

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      • #4
        good job. id like to see this installed.

        where will you amp be located? under parcel shelf?
        '02 GTI (clicky) - REFLEX SILVER - VIEZU race tune. VAR design 2.5inch stainless steel dump pipe with 100cell cat into 2.5" billyboat stainless cat back, Forge TIP, N75, Audi DV, ghetto CAI, FK-AK s coilovers, tunerdone LEDs, Clarion CZ301E sound stage.

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        • #5
          Originally posted by stotto View Post
          Looking Good. Does the fibreglass attach to the MDF some how ?
          During the fitting process it was held in with 4 screws, Once i was happy with the internals, Used 'no nails' type filler/adhesive
          2004 VW Bora v5 Auto

          Hairy_mic' custom audio build http://www.vwwatercooled.com.au/foru...ent-85117.html

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          • #6
            Yes parcel shelf will be the place. (going to sound deaden it first though )
            2004 VW Bora v5 Auto

            Hairy_mic' custom audio build http://www.vwwatercooled.com.au/foru...ent-85117.html

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            • #7
              Nice!
              going to be doing similar on the first aid kit side of the boot as I use the pocket too often to remove it
              Bora gone
              Vento VR6
              MKIV GSW TDI
              7P Touareg TDI

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              • #8
                Originally posted by dylan8 View Post
                Nice!
                going to be doing similar on the first aid kit side of the boot as I use the pocket too often to remove it
                Considered that], will be doing the other side eventually
                2004 VW Bora v5 Auto

                Hairy_mic' custom audio build http://www.vwwatercooled.com.au/foru...ent-85117.html

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                • #9
                  Looks good.

                  How big is the enclosure (internal)?

                  On porting, I prefer not to port a box unless there is a reason. Port sizes, lengths and locations are crucial to making the sub output flat (not a one-note wonder). Not trying to detract from a good build, just didn't see the port / box sizing detailed. You could always block off the port to see how it sounds if the frequency response is a little lumpy.

                  I'm envious of your fiber-glassing, always wanted to have a go, always new I'd mess it up / make more mess than do good.

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                  • #10
                    Good job

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                    • #11
                      awesome use of space. And a killer DIY.

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                      • #12
                        Can you post a finished in car pic great job

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                        • #13
                          Well done mate, I've planned and chickened out so many times from fibre glass, just heard terrible things with workability and itchyness lol

                          I always just end up building an mdf box with specified dimensions for the sub, but they take up so much room.

                          Maybe it's time I gave this a go haha
                          CURRENT: DBP Mk4 Golf .:R34 no. 187 (WOOKY)
                          Mods: C2 Motorsport Custom Tune | 268/264 schrick cams | Eurospecsport forged rods | JE forged pistons | Miltec Headers back | Higher compression | Engine fully ported | polished balanced crank | Sach Motorsport clutch | Single mass flywheel | Wavetrack LSD | Shortened 4th/5th/6th | etc etc |

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                          • #14
                            Originally posted by Swainey32 View Post
                            Well done mate, I've planned and chickened out so many times from fibre glass, just heard terrible things with workability and itchyness lol

                            I always just end up building an mdf box with specified dimensions for the sub, but they take up so much room.

                            Maybe it's time I gave this a go haha
                            This was my first time using fibre glass, and tbh i think the stuff is fantastic. as far as itchyness goes? wear long sleeves, and dust mask, and youll be fine
                            2004 VW Bora v5 Auto

                            Hairy_mic' custom audio build http://www.vwwatercooled.com.au/foru...ent-85117.html

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                            • #15
                              Nice build of the sub box,

                              What I could recommend to improve on the low end for this box or any future box.
                              Don't worry about the dacron fill at all. Instead, Use sound deadening, to seal the wood face to rear and any other possible leaks.
                              Then do exactly what you did with your 6-8mm rubber/pvc sheets. that is al you need.

                              Nice work, and good on you for giving it a crack.
                              Audi S4 (2001) - Imola Yellow
                              Secret Project

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