Promax. Paid for and waiting for the phone call....

A12 Mopar Discussions

  1. biomedtechguy

    biomedtechguy FBBO Gold Member FBBO Gold Member

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    I got the majority of Promax 6 bbl upgrades available, and likely the couple I missed will be added when I send them my 3 x 2bbls.
    My 70 V-code (71 motor) 6 bbl overall runs good. Nice kick in the ass when the outboard carbs open gradually under vacuum, which I can feel the smooth but powerful transition when I am half throttle or so and let the RPMs climb, increasing vacuum and transitioning the outboard carbs open vs up shifting w/my standard transmission. Same thing when I stomp it from a dead stop. No stumble or hesitation. I occasionally have some idle weirdness, and the carbs over weeks seem to always creep richer.
    Anyway, the point is that after I spent some time tweaking them soon after I got my Roadrunner about 4+ years ago, they have run pretty well.
    I am bonkers for the 6 bbl setup, I'm stoked to take them to the next level, and when I top off my future stroker motor with the 6bbl the Promax parts will be invaluable.
    I'm getting a dual band wideband O2 sensor and gauge soon as well, and I will finally install the new Carter M6903 high flow fuel pump I've had for 2 years.
     
    Last edited: Jun 5, 2018
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    • biomedtechguy

      biomedtechguy FBBO Gold Member FBBO Gold Member

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      Install complete. Those damn silver aluminum fuel fitting to fuel bowl washers sucked for me, 2 out of 3 leaked badly. I replaced them with the factory thin steel washers and that fixed the leaks. Promax is sending me nylon washers, so I may try them, but I may not anytime soon since the leaks are gone.
      I still have to adjust the 6 idle mixture screws, but I took a test drive and it was pretty good, just still rich at idle.
      Also installed the Carter M6903 mech fuel pump which I really like so far.
      20180923_134808.jpg 20180923_155147.jpg 20180923_183803.jpg 20180923_183928.jpg
       
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      • Pete Bell68

        Pete Bell68 FBBO Gold Member FBBO Gold Member

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        Love this car , nice work man
         
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        • biomedtechguy

          biomedtechguy FBBO Gold Member FBBO Gold Member

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          Thanks Pete.
          After the date of the video I had a whole week of drive time w/the new Promax modded Holley carbs. Something is wrong because other when I first got my car and the outboard carbs were not opening (required a slight adjustment of the threaded rods that connect to the throttle plates) other than then, my car has never run worse.
          :BangHead::cursin:
          I have a bad stutter that I have had a week to evaluate and seethe over.
          My thoughts are some debris got through to the carb(s) so I am going to disassemble and clean.
          I'll follow up (unlike Promax)
          EDIT:
          To be fair to Promax, I just got off the phone with them. They were out of town at an event.
          He made some suggestions, I will follow up with a post.
           
          Last edited: Oct 11, 2018
        • dla4567

          dla4567 Well-Known Member

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          I got a Promax metering block last year. I’ve heard good things and wanted to try it out. Car ran terrible and wouldn’t stay running. Put the stock one back in and the Promax one has been sitting on the shelf ever since.
          I know a guy that bought Promax stuff years ago and loves it. When he ordered it they wanted to know all about his car and how the engine was built. When I ordered mine they didn’t ask anything. The metering block I got is different than the one he got. His also has Promax engraved on the side and mine does not. Before I ordered mine I was unable to reach anybody at Promax for a few months. I think something has changed in that time period. I could be wrong but I won’t be buying anything else from Promax.
          I’ve tested about 5 or 6 different metering blocks for the six pack set up and found that with good fuel nothing beats the factory one. With pump gas I ran one from a four barrrl carb, (can’t recall the part number off hand).
          Good luck to you, hope it works out well.
           
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          • biomedtechguy

            biomedtechguy FBBO Gold Member FBBO Gold Member

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            FYI
             
          • khryslerkid

            khryslerkid FBBO Gold Member FBBO Gold Member

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            Nice work, hope you figure it out.

            I need a return spring like you're useing. Any info, measurements?
             
          • Pete Bell68

            Pete Bell68 FBBO Gold Member FBBO Gold Member

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            That's too bad especially when you wait for something to arrive then it shows up and doesn't work .
            Could it be lack of fuel - stutter ?, different carbs while cruising needs different timing ?
            Hose collapsed or kink inside when installing ?
            What happens when floored ?
             
          • biomedtechguy

            biomedtechguy FBBO Gold Member FBBO Gold Member

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            I just got off the phone with Promax.
            I have 3 glass sight plugs now and I am going to check the float levels on all 3 carbs. I have decided to check the inline fuel filter as well for debris for peace of mind. Someone recommended and I should have done this as well-flush the new lower and upper fuel lines before hooking them up to the carbs.
            If the float levels are ok or after adjusting it still runs bad I am going to readjust the idle mixture screws.
            If that doesn't help I will disassemble and clean out the fuel bowls, needles and seats, and the center Promax metering block.
            I will follow up.
            No info on the return spring, it came with the car. I will measure when I can. Playing catch up with work. I can't even fool with the carbs right now.
             
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            • 68 HEMI GTS

              68 HEMI GTS Well-Known Member

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              I believe the promax block is an engraved BLP block. Advantage is if you would need different IFR’s or PVCR’s they are adjustable. If the original primary block happens to be suited for the combo, there is absolutely no advantage to the aftermarket block other than it looks cool.
               
            • biomedtechguy

              biomedtechguy FBBO Gold Member FBBO Gold Member

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              Explain please
               
            • 68 HEMI GTS

              68 HEMI GTS Well-Known Member

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              IFR- idle feed restriction
              PVCR- power valve channel restriction
               
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              • biomedtechguy

                biomedtechguy FBBO Gold Member FBBO Gold Member

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                :lowdown: 68 HEMI GTS carburetor knowledge
                 
              • Pete Bell68

                Pete Bell68 FBBO Gold Member FBBO Gold Member

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                Did it work ? I learn so much stuff on this site ..
                 
              • TimS

                TimS Well-Known Member

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                My experience with Promax was not good so beware. They talk a good game but they do not back anything up when they work on something and it isn't right. They redid a 69 Carter AVS carb for me few years ago. Did not work when installed back on my Bee and they basically washed their hands of it and charged me quite a bit to rework it. Got their money and ran basically. As I said beware.
                 
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