Re drill a8 discs to 4x108?

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  • andy10v
    S2Forum Zealot
    • Mar 2009
    • 5996
    • Country: Scotland

    #1

    Re drill a8 discs to 4x108?

    Just wondering if the a8 discs can be re drilled to 4x108?

    Just if so it would make installing a set of bigger brakes a bit cheaper but dont know if the a8 discs have enough meat to re drill, I have seen some five stud discs with 10 holes?

    andy
    Current-2004 Impreza PPP wagon

    Sold-92 3B coupe-RS2+, 996s, konis, rear torsen, forged rods........
    Sold ABY-stock
  • Ruffiano
    S2Forum Extremist
    • Sep 2007
    • 1458
    • Home: Italy Current: United States

    #2
    Yes, BostonCQ (who is also on this forum) recently did this:

    Hi all, This thread is for my 1991 CQ which I purchased last summer in Burlington, VT. In a slight deviation from previous project threads, I'd like to keep all discussion separate from the actual project thread. Please post all comments/questions/etc. over here...

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    • madpugger
      S2Forum Extremist
      • Sep 2007
      • 1901
      • Country: Scotland

      #3
      Genuine audi A8 disks have 10 holes, at least all four of mine do. Cheaper ones may not have ten holes so re-drilling could be done.

      Le Mans 2012
      Nurburgring 700
      1995 S2 Avant

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      • hibby
        S2Forum Addict
        • Apr 2007
        • 215
        • Country: Scotland

        #4
        Acidburn was talking of someone using ford discs insted as they are 4x108 already. I have never bothered asking more about this as I have no plans for a brake upgrade just now. But maybe he could pipe up now and tell us who done it or how it was done?

        Think it was someone on this forum.
        1990 Cq20v GTi Engineering RE2400
        1992 16v 80 quattro
        2004 A3

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        • Le S2 Audi
          S2Forum Possessed
          • Jul 2009
          • 3805
          • Home: Scotland Current: England

          #5
          Originally posted by andy10v
          Just wondering if the a8 discs can be re drilled to 4x108?

          Just if so it would make installing a set of bigger brakes a bit cheaper but dont know if the a8 discs have enough meat to re drill, I have seen some five stud discs with 10 holes?

          andy
          I know we scots have a reputation of being tight... but are you not taking the money saving a little too far???

          At the end of the day BRAKES can save your life (or not) are you sure you wanna cut corners for A FEW QUID????

          What if you sell the car to someone who has a young family..... would you take the resposability for them in a crash????

          Food for thought!!!


          sigpic

          New S2 - S8 & RS2 -RS6 Keyrings

          Comment

          • kwlw
            S2Forum Extremist
            • Sep 2004
            • 1025
            • Country: Lithuania

            #6
            Originally posted by Le S2 Audi
            At the end of the day BRAKES can save your life (or not) are you sure you wanna cut corners for A FEW QUID????
            If you try to understand, what holds brake disk in place - you won't be so scared. It's the wheel, not the brake disk holes. Of course if you have spare money - you can spend it for S2/urq struts. But remember there's thin line between true safety, and paranoia. I prefer to take risks if I can fully understand them (sometimes even CAD analysis helps me there).

            Sau
            200 20vt 88' 3b, human carrier
            CQ typ85 with AAN inside, see project blog at http://kwlw.blogspot.com

            Comment

            • Acidburn
              S2Forum Obsessed
              • Jun 2007
              • 13459
              • Country: United Kingdom

              #7
              Use focus rs discs, it has been done by a forum member on here before on his car, found the thread



              Brakes :
              Front : 328 x28mm brake discs from Ford Focus RS (machined to fit), Audi RS2 (brembo) brake calipers with homemade spacer

              Comment

              • madpugger
                S2Forum Extremist
                • Sep 2007
                • 1901
                • Country: Scotland

                #8
                Originally posted by Le S2 Audi
                I know we scots have a reputation of being tight... but are you not taking the money saving a little too far???

                At the end of the day BRAKES can save your life (or not) are you sure you wanna cut corners for A FEW QUID????

                What if you sell the car to someone who has a young family..... would you take the resposability for them in a crash????

                Food for thought!!!

                Where is the danger?!

                Le Mans 2012
                Nurburgring 700
                1995 S2 Avant

                Comment

                • andy10v
                  S2Forum Zealot
                  • Mar 2009
                  • 5996
                  • Country: Scotland

                  #9
                  Le S2 Audi-thanks but I dont get the probem, you get discs with 10 holes in them, i am just talking about having ones with 9, whats the issue?

                  Everyone else thanks, much appreciated.

                  Andy
                  Current-2004 Impreza PPP wagon

                  Sold-92 3B coupe-RS2+, 996s, konis, rear torsen, forged rods........
                  Sold ABY-stock

                  Comment

                  • hibby
                    S2Forum Addict
                    • Apr 2007
                    • 215
                    • Country: Scotland

                    #10
                    Originally posted by andy10v
                    Le S2 Audi-thanks but I dont get the probem, you get discs with 10 holes in them, i am just talking about having ones with 9, whats the issue?

                    Everyone else thanks, much appreciated.

                    Andy

                    You know that you will only have 8 holes, and one of them will be very oddly shaped as one of the new holes will overlap with the original holes?

                    Jasiin looked into re drilling his hubs for his TDi project but found it couldn't be done to the hubs safely as one of the holes overlapped.

                    I don't have a clue if it is safe or not on brake discs, just letting you know.

                    He had a diagram of this but I cant be arsed looking through a 68 page project thread to find it for you just now.
                    1990 Cq20v GTi Engineering RE2400
                    1992 16v 80 quattro
                    2004 A3

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                    • Le S2 Audi
                      S2Forum Possessed
                      • Jul 2009
                      • 3805
                      • Home: Scotland Current: England

                      #11
                      Sorry Guys, didn't mean to upset anyone

                      My thoughts were based around the fact if the manufacturer don't do them with that DP is there not a reason for it!! by drilling holes in the hub are you not infact weakening the overall structure of the disk???

                      I am not an engineer or a mechanic so I maybe talking total b**locks but lets just say you did this "conversion" and then they failed - on the off chance -and you totalled the car...

                      Could you resonably argue with the IC that "your" conversion didn't cause it....

                      All for saving a few quid....

                      sigpic

                      New S2 - S8 & RS2 -RS6 Keyrings

                      Comment

                      • andy10v
                        S2Forum Zealot
                        • Mar 2009
                        • 5996
                        • Country: Scotland

                        #12
                        Thanks, I had forgotten about that


                        Hmm, if that diagrams right then two overlap.

                        Just pondering options at the moment.
                        Current-2004 Impreza PPP wagon

                        Sold-92 3B coupe-RS2+, 996s, konis, rear torsen, forged rods........
                        Sold ABY-stock

                        Comment

                        • andy10v
                          S2Forum Zealot
                          • Mar 2009
                          • 5996
                          • Country: Scotland

                          #13
                          Le S2 Audi-dont be sorry, I appreciate the input, I was thinking the disc is clamped by the wheel rather than stopped from rotating by the bolts, also I am talking about drilling the disc rather than the hub.

                          I wont be putting bigger brakes on tommorrow, just costing up options.
                          Current-2004 Impreza PPP wagon

                          Sold-92 3B coupe-RS2+, 996s, konis, rear torsen, forged rods........
                          Sold ABY-stock

                          Comment

                          • Le S2 Audi
                            S2Forum Possessed
                            • Jul 2009
                            • 3805
                            • Home: Scotland Current: England

                            #14
                            Originally posted by andy10v
                            I am talking about drilling the disc rather than the hub.
                            Sorry - I meant the disc "hub" not the disc it's self

                            sigpic

                            New S2 - S8 & RS2 -RS6 Keyrings

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                            • Acidburn
                              S2Forum Obsessed
                              • Jun 2007
                              • 13459
                              • Country: United Kingdom

                              #15
                              One of my mates has been working on turning a 4 stud hub into 5 stud but don't know how far he got, he was planning on fitting it to a cheap 20v cq etc and testing it out.

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