Dual quad Edelbrock tuning...

Fuel and Air Systems

  1. j par

    j par Well-hung Member

    Messages:
    20,104
    Likes Received:
    9876
    Joined:
    Jul 2, 2014
    Location:
    Portland Oregon
    Local Time:
    9:50 PM
    I have a Carter performance 625 on the back as my primary and a 1406 on the front. I have the same metering rods Jets and springs in both. I have 92 jets in the secondaries and 95 in the front with 7547 metering rods. I have the medium Springs #3.
    I have a wideband O2 sensor in the driver side exhaust. I did two adjustments as always LOL and put the 7547 metering rods in in lieu of the 7147's and brought the idle almost up to the 14-7 I would like it to be. But at the same time I put the number 4 heavier Springs in and it made the secondaries go away lean and lose power. I put the number three Springs back in and everything kind of went back to normal with the idle again at 14 5 or so and at cruise speed it was around 13 2 to 13 7 but again wot was down to about 11 2 to 10 9. At this point I'm thinking getting the 89 jets for the secondaries and trying to get that wide open throttle up to a 12 5 where I want it. Also I have all the vacuum capabilities plugged all the way around the carburetors and I'm just wondering if these economy carburetors would rather have the rear vacuum ports going into a PCV valve and getting a little more air? On the passenger side I run an Evac out of that exhaust and an open breather on the driver side. Anyone's thoughts and experiences would sure be appreciated as this year I want to get these carburetors exactly the way they should be..
    Thank you..
     
  2. 318willrun

    318willrun Roadkill '80 D150

    Messages:
    12,901
    Likes Received:
    12888
    Joined:
    Sep 13, 2013
    Location:
    I'm here
    Local Time:
    11:50 PM
    Why do you have bigger jets in the primaries (95) than the secondaries? (92)
     
    • Thanks! Thanks! x 1
    • jas0162

      jas0162 Well-Known Member

      Messages:
      477
      Likes Received:
      292
      Joined:
      Apr 23, 2014
      Location:
      kansas
      Local Time:
      11:50 PM
      Carter and Edelbrock carbs usually have the bigger jet in the primary side. There is a metering rod stuck in it most of the time.
       
    • 318willrun

      318willrun Roadkill '80 D150

      Messages:
      12,901
      Likes Received:
      12888
      Joined:
      Sep 13, 2013
      Location:
      I'm here
      Local Time:
      11:50 PM
      Ahhh… ok. Then I would still richen the secondaries……
       
    • rumblefish360

      rumblefish360 So close, yet so far away

      Messages:
      36,981
      Likes Received:
      8802
      Joined:
      Jun 21, 2005
      Location:
      New York, on a Island
      Local Time:
      12:50 AM
    • 318willrun

      318willrun Roadkill '80 D150

      Messages:
      12,901
      Likes Received:
      12888
      Joined:
      Sep 13, 2013
      Location:
      I'm here
      Local Time:
      11:50 PM
      Is your throttle linkage progressive or direct?
       
      • Like Like x 1
      • j par

        j par Well-hung Member

        Messages:
        20,104
        Likes Received:
        9876
        Joined:
        Jul 2, 2014
        Location:
        Portland Oregon
        Local Time:
        9:50 PM
        It's 1 to 1 or as you put it Direct now but I've ran it Progressive... The progressive makes it a little bit more easy to manage with the clutch as far as Street manners go but I still prefer one to one...
         
      • 318willrun

        318willrun Roadkill '80 D150

        Messages:
        12,901
        Likes Received:
        12888
        Joined:
        Sep 13, 2013
        Location:
        I'm here
        Local Time:
        11:50 PM
        ok, I think for the street and gas mileage progressive may be more optional. Don't need to be working two accelerator pumps all the time. Direct is more All out race.
         
        • Like Like x 1
        • j par

          j par Well-hung Member

          Messages:
          20,104
          Likes Received:
          9876
          Joined:
          Jul 2, 2014
          Location:
          Portland Oregon
          Local Time:
          9:50 PM
          That's rich excuse the pun gas mileage with dual quads LOL...
           
        • rumblefish360

          rumblefish360 So close, yet so far away

          Messages:
          36,981
          Likes Received:
          8802
          Joined:
          Jun 21, 2005
          Location:
          New York, on a Island
          Local Time:
          12:50 AM
          Dual Quad Dual Plane or Dual Quads up top a tunnel ram? I don’t see a reason a progressive linkage DQDP can’t get reasonable mileage.
           
        • 318willrun

          318willrun Roadkill '80 D150

          Messages:
          12,901
          Likes Received:
          12888
          Joined:
          Sep 13, 2013
          Location:
          I'm here
          Local Time:
          11:50 PM
          i get it... just planning ahead for myself.. lol.
           
          • Like Like x 1
          • 318willrun

            318willrun Roadkill '80 D150

            Messages:
            12,901
            Likes Received:
            12888
            Joined:
            Sep 13, 2013
            Location:
            I'm here
            Local Time:
            11:50 PM
            But just for the record, I can put 7 gallons in my 360 Duster, drive 1 hr to the strip, run it through 4 - 5 times, and easily make the 1 hr drive back home.
             
          1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
            By continuing to use this site, you are consenting to our use of cookies.