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  • New Bolt-on Subframe connectors

    I'm going to get some this summer - umiperformance bolt-in subframe connectors.

    They have 2-pt and 3-pt.

    http://umiperformance.com/2002.aspx
    http://umiperformance.com/2004.aspx

    I am going to get the 2-pt and I will dig up this thread with a review in a month or so. If you have these, please chime in!
    2002 5-spd NBM Camaro
    Details: www.1lev6.com

  • #2
    Re: New Bolt-on Subframe connectors

    I was actually thinking of getting the bolt on's and spot welding them once they are installed. Just incase I ever have to remove them again, it won't be as hard as the fully welded SFC's. The weld-in SFC's were a PIAN IN THE ARSE to remove!
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    • #3
      Re: New Bolt-on Subframe connectors

      I really think the way these are designed, provided you use a little loctite and torque them right, they will be just as strong as a weld without the pain in the *** to remove feature :) When I put some on, I'll report back.
      2002 5-spd NBM Camaro
      Details: www.1lev6.com

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      • #4
        Re: New Bolt-on Subframe connectors

        The problem is that you are placing the load on the edge of a hole through the sheet metal pan, which is a pretty weak thing. The weld ins distribute the load over the surface of the pan.

        They might work ok. might not. One test will be to use them for a while, remove the bolts and look at the holes. If they are round. fine. If they are distorted, I would weld them.
        2000 Firebird convert, chameleon/tan, M5, Y87, TCS, BMR tower brace and panhard, KBDD sfcs, 245/50-16 GSCs

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        • #5
          Re: New Bolt-on Subframe connectors

          Originally posted by V6Bob
          The problem is that you are placing the load on the edge of a hole through the sheet metal pan, which is a pretty weak thing. The weld ins distribute the load over the surface of the pan.

          They might work ok. might not. One test will be to use them for a while, remove the bolts and look at the holes. If they are round. fine. If they are distorted, I would weld them.
          Actually the spot where put the bolts through is reinforced with a u channel type sub frame. that spot is actually quite strong.

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          • #6
            Re: New Bolt-on Subframe connectors

            Well you are using a big washer, twin bolts, and the load is being distributed over the entire piece of steel flat against the other. With the proper amount of torque there will be no movement of the piece and no bending either.

            The amount of force and the overall movement of the chassis up/down isn't very great. The whole idea is chassis bracing, simply to stop it from being springy by adding a stiff piece.

            Also, by going with bolt-ins you don't have to worry about having a bad welding experience. That's my main motivation - something that works well and keeps me from having to seek out a good welder that won't put holes in the frame or catch my carpet on fire or do anything stupid. No welds = better than bad welds.
            2002 5-spd NBM Camaro
            Details: www.1lev6.com

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            • #7
              Re: New Bolt-on Subframe connectors

              would it be worth it to get the 2pt ones or would i be better off saving my money for the 3pt? im just curious as to how much of a difference there is in handling between the two styles.
              2000 v6 a4 Camaro

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              • #8
                Re: New Bolt-on Subframe connectors

                Originally posted by lookout4theyeti
                would it be worth it to get the 2pt ones or would i be better off saving my money for the 3pt? im just curious as to how much of a difference there is in handling between the two styles.
                The 2 pt. SFC's are better than nothing. The 3 pt. are the best, but get what you can afford.
                Welding them is also better than bolting. I had welded SFC's once, but I cut them off due to wear-n-tear from my old garage which had a nasty high angle when driving into it. It dented, scratched, then began creasing the old SFC's, so I had to cut them off with a grinder after a few years. It took me HOURS to get them off completely...then some of the old creeks & rattles came back too. I'm going to bolt on's this summer, but will probably spot weld them once they are on. It'll save alot of time if I ever have to remove them again.
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                • #9
                  Re: New Bolt-on Subframe connectors

                  Originally posted by Dominic
                  Well you are using a big washer, twin bolts, and the load is being distributed over the entire piece of steel flat against the other. With the proper amount of torque there will be no movement of the piece and no bending either.
                  I respectfully disagree. The washer isn't going to transfer any significant sideways load. And sideways loads are going to load to bolts in bending, which is not their strong point. It may be OK, but it's surely not a sure thing. Welds are clearly better engineering in this application.

                  Originally posted by Dominic
                  Also, by going with bolt-ins you don't have to worry about having a bad welding experience. That's my main motivation - something that works well and keeps me from having to seek out a good welder that won't put holes in the frame or catch my carpet on fire or do anything stupid. No welds = better than bad welds.
                  I kinda agree, if you get a bad installer. But in my experience it wasn't hard to find a good one with specific experience with sfcs. His welds look good and I watched him move around so as to not put excessive heat into the carpet, etc.

                  "would it be worth it to get the 2pt ones or would i be better off saving my money for the 3pt? im just curious as to how much of a difference there is in handling between the two styles."

                  It depends on a lot of things, design, size/thickness of tubing, etc. Lotsa folks like to guess, but what good is that? There is no actual data. As indicated above, proper installation is very important, probably moreso than which sfcs you get.
                  Last edited by V6Bob; 04-07-2006, 12:37 AM.
                  2000 Firebird convert, chameleon/tan, M5, Y87, TCS, BMR tower brace and panhard, KBDD sfcs, 245/50-16 GSCs

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