Dyno pull

Discussion in 'Mopar Performance Issues' started by Duster 383, Dec 30, 2017.

  1. Duster 383

    Duster 383 Well-Known Member

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    So me and my dad got the 383 duster on the Dyno yesterday and I was shocked by the numbers we got ...theses are the specs that "we have been told " about this motor

    69 383
    Ported and polished stock heads
    Mild cam( durations unknown)
    Edelbrock dual plane intake
    850 Holley carb
    Over the fender headers ...look like 1.25-1.5 primaries
    727 manual valvebody 3200 stall

    Now the third and final pull in 3rd resulted in 243hp@5500 rpm and 258ftlb torque @ 2800

    Why are these numbers low ..I thought for sure the way this thing drives that it would easy be in the mid 300 range ...were my expectations to high ??
     
  2. rumblefish360

    rumblefish360 so close yet so far away

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    Header size is abnormally small, heck again.
    Cam size unknown. Huge amount of information missing there, HUGE!
    Ported heads. OK, unless you know what it flows , you might as well have stock heads.

    What dual plane Edelbrock? There are a few of them. Some not worth more than an OE replacement and others worth there weight.

    Rear wheel dyno numbers also reflect how effective or not the converter is, the 727 eats a bit of power and the true size with gear ratio.
     
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    • Duster 383

      Duster 383 Well-Known Member

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      Yeah it really sucks cause the owner gave us no help whatsoever ...now is it true that the stock heads on a 383 are the same ones on a 440 ???
       
    • mopowers

      mopowers Well-Known Member

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      Anyone have a crystal ball?
       
    • Duster 383

      Duster 383 Well-Known Member

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      Hahaha I wish the guy we bought it off of didn't do any of the work and he does remember what the previous owner did beside what I said at the beginning of the post ..really frustrated
       
    • BigBlockMopar

      BigBlockMopar BigBlockMember

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      A stock 4bbl 383 would have had around 325-335 hp as I recall from the factory.
      Now give it 40 years of wear, a lousy tune-up, a slipping convertor and your rearwheel dynonumbers don't seem that out of line.

      How about a pic of that "disappointment" under the hood...
       
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      • 70aarcuda

        70aarcuda Master Hoader of SBM FABO Gold Member

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        and be as specific as you can with parts...what is in the engine....ignition system...timing...carb jetting?

        And if you say you dont know...there is one of your problems...you are going to have to learn...and tune it...
         
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        • Duster 383

          Duster 383 Well-Known Member

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          IMG_20171116_082330_01.jpg
           
        • Duster 383

          Duster 383 Well-Known Member

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          Yeah it's gonna take time to learn and I really....really want to learn so if that means looking and asking stupid questions to get smarter then so be it lol
           
        • Duster 383

          Duster 383 Well-Known Member

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        • 72Dart6pack

          72Dart6pack Harder Better Faster Stronger.

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          So much missing in this post. I'm not even going to try. I'll just say sorry for your loss of power & torque. Chalk it up to buying unknown parts & try again. Good luck on your quest!
           
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          • mopowers

            mopowers Well-Known Member

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            I know of a couple dynos you can go to and instantly gain 100 hp. LOL
             
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            • AJ/FormS

              AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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              Does it spin the tires all the way thru first gear with 3.55s?
              Then where's the problem?lol
               
            • Plymouth 65

              Plymouth 65 Floorable Deplorable

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              You're numbers are not low because you really don't know what you have there. Compression, cam, rear gear, and converter define numbers. ET is defined by the driver! 65'
               
            • rumblefish360

              rumblefish360 so close yet so far away

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              If we have to explain, you wouldn’t understand!
              :rofl:

              Just pulling your chain AJ!
               
            • rumblefish360

              rumblefish360 so close yet so far away

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              Year dependent, yes.
               
            • rumblefish360

              rumblefish360 so close yet so far away

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              I’m under the impression that this dyno run was a rear wheel test.
               
            • 3406pk

              3406pk Well-Known Member

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              When it was on dyno, did they record air/fuel ratio. If so, that will give idea about carb tuning and jetting. A good start on tuning is to do compression test to see if any major concerns with rings or valves. Then check and/or set timing to about 15 deg initial and 34 deg total. See how runs, then just enjoy what you have or start over and rebuild with known parts.
               
            • fishmens67

              fishmens67 Well-Known Member

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              That's what I'm thinking. a slightly warmed over 383 capable of 13.50 's @ 97 in a 3300# tuned chassis
               
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              • Louie70Dart

                Louie70Dart Back home in K-Town WI. Woo Hoo FABO Gold Member

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                That number is at the crank, not wheels. And the HP numbers is dependent on what head it has.
                 
              • Duster 383

                Duster 383 Well-Known Member

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                It has a locker and 4:11
                 
              • Duster 383

                Duster 383 Well-Known Member

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                Yes correct
                 
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                • Duster 383

                  Duster 383 Well-Known Member

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                  We have a 69 motor so what yr 440 would I need to get ??
                   
                • Duster 383

                  Duster 383 Well-Known Member

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                  the stuck a sensor in the tail pipe ...@ idle it hovered around 10.7-11.3
                  @2000 rpm 11.5-12.4
                  The rest of the rpm range was around 12.4-13.1
                   
                • Duster 383

                  Duster 383 Well-Known Member

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                  This was idle

                  IMG_20171229_104651940.jpg