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Cowl Shake
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droptop73


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Meet and Greet 10 - 14 Shooter

    Post: #1
    Cowl Shake

    Hey guys I am looking for some input. Without adding a rollbar or cage, I am looking ways to reinforce the car. I plan to build some subframe connectors similar to the global or maier pieces. I am thinking of adding a center reinforcement similar to the total control unit. has anyone tied the connectors into the original rockers? I am also thinking of seam welding the shock towers and adding the boss 302 gussets to the towers near the upper control arms. My goal is to have a nice quiet (as quiet as a convertible can be) good handling road car. The mods must be as invisible as possible.
    Offline 07-07-2010 06:44 PM
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    cobra3073


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      Post: #2
      RE: Cowl Shake

      It is important to remember that to a vast degree, shock dampening determines ride. If a smooth ride is your priority, you should go for some type of standard gas shocks - - stay from the stiffer ones like KYB and Konis.

      Furthermore, if your rear springs are getting a bit tired, you might want to swap them out for some stiffer five-leaf, mideye with rubber or urethane bushings. In the front, go with 620 coils.

      Hope this helps!

      BT
      Offline 07-25-2010 07:27 PM
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      xjwrench



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      Marines

        Post: #3
        RE: Cowl Shake

        Once you start adding all that reinforcement the car becomes more ridge which in turn with make any type of vibrations be amplified to any other parts like dashs, seats, interior brackets and such. Causing a very loud interior. Some ways of fixing those rattles though and putting in the stiffners and such is to run that one side sticky foam under every screw on the dash and interior panel. (pain in the butt) If you are just looking for ride quality cobra3073 could not have said it better. Unless you wanted to go with air bags all the way around.

        Hope that helps

        Cory
        Offline 08-10-2010 01:41 PM
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        droptop73


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        Meet and Greet 10 - 14 Shooter

          Post: #4
          RE: Cowl Shake

          Good points, The subframe connectors will add some good rigidity. Maybe go 1 step at a time. suspension upgrades are in the mix as well.
          Offline 08-10-2010 06:37 PM
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          72HCODE


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            Post: #5
            RE: Cowl Shake

            We have one club guy with a gold glow 71 vert. He installed subframe connectors recently and has been raving about the benefits. Verts are so wiggly to start that adding the subframes would at least get you the structural integrity of a coupe or fast back.

            After he installed the subframes he said it was a different car, worth doing in my book.

            Eventually I would install subframe connectors on my fastback.
            (This post was last modified: 08-24-2010 07:42 AM by 72HCODE.)
            Offline 08-24-2010 07:39 AM
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            droptop73


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              Post: #6
              RE: Cowl Shake

              Now it's a matter of making a pattern and getting some tubing bent. I'm plotting to build a set... kinda a cross between the GW and Maier pieces, wrapping around the rear rail and also tying into the spring perch area. I'd like to add an X brace ala the TCI system. I LOVE building this stuff!
              Offline 08-24-2010 11:49 AM
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              Robotec1



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                Post: #7
                RE: Cowl Shake

                (07-07-2010 06:44 PM)droptop73 Wrote:  Hey guys I am looking for some input. Without adding a rollbar or cage, I am looking ways to reinforce the car. I plan to build some subframe connectors similar to the global or maier pieces. I am thinking of adding a center reinforcement similar to the total control unit. has anyone tied the connectors into the original rockers? I am also thinking of seam welding the shock towers and adding the boss 302 gussets to the towers near the upper control arms. My goal is to have a nice quiet (as quiet as a convertible can be) good handling road car. The mods must be as invisible as possible.

                Thanks for posting the question and for the answers! I am going to go with the suggestions here about the subframe connectors and then change the rear springs if necessary.
                I sprayed the lizard skin on my 71 convertible to help keep it quiet. It wasn't hard to do, kinda fun really.
                Offline 09-11-2010 08:22 PM
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                Stocktrader



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                  Post: #8
                  RE: Cowl Shake

                  Make sure your door hinges and lock pin are tight and use new door seals. I upgraded the size of my door bushings and replaced everything else. It still flexes the body but it is more like a flex rather than a big rattle when I go over RR tracks.
                  Tight doors make a big difference and doesn't alter the car. Cheaper too.
                  Offline 10-14-2010 12:25 PM
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                  Tnfastbk



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                    Post: #9
                    RE: Cowl Shake

                    Thanks for posting the question and for the answers! I am going to go with the suggestions here about the subframe connectors and then change the rear springs if necessary.
                    I sprayed the lizard skin on my 71 convertible to help keep it quiet. It wasn't hard to do, kinda fun really.
                    [/quote]

                    Do you like the lizzard skin compared to Dyna-Mat?
                    Offline 10-14-2010 01:05 PM
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                    OLE PONY


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                    Car of the Month Trophy Meet and Greet 1 - 4

                      Post: #10
                      RE: Cowl Shake

                      The convertibles came from the factory with an extra support plate about halfway back and under the driveshaft. It's rectangular and without looking, its about 18x24 inches (just a guess). You might want to make sure it's still there and someone didn't' leave it off after servicing the u-joints, exhaust, or trans. I know on mine it's always a pain in the rear to keep the exhaust pipe from rattling against it. Just a thought!
                      Offline 10-14-2010 05:59 PM
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