why a custom built converter isn't for everyone....

Mopar Racers Forum

do you agree with the 1st post?

  1. yes, I agree

    20 vote(s)
    62.5%
  2. Nope, I disagree

    12 vote(s)
    37.5%
  1. famous bob

    famous bob mopar misfit

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    I called one of the recommended conv. guys , and told him my combination and what I had , he said it sounded about right , and having him build me one would be about $975 plus shipping . I got the coin saved , but dont like laying under a car any more = getting too old !
     
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    • BVoelzke

      BVoelzke Dart Racer

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      Buy the converter you are happy with and can afford if you feel you want to upgrade to a custom built later on thats an option.IMO its better to have one built to your combos specs but its not absolutely necessary especially in a street driven car. A few years ago I was considering an " off the shelf " converter for the 518 in my 92 D150 as I wanted better 60 ft times. I spoke to the guy( Lenny at Ultimate ) who did my two 8 inch 904 converters and he said send me your stock lock up converter and I will redo it, well he did and I went from 2.20 60fts to 2.00s and it was only a few hundred bucks. Years ago I had a pretty much stock 318 in my Dart while my 340 was being redone, it ran 13.20s with 3.91 gears a 10 inch converter and a manual valve body 904, I swapped to an 8 inch Turbo-Action converter 4,700 stall right out of the old Mopar Performance catalog and starting running 12.70s with no other changes. Before purchasing a whole new converter maybe consider having your existing one redone for a higher stall speed as it can be done sometimes for less than a whole new converter would cost.

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      Last edited: Dec 15, 2020
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      • RustyRatRod

        RustyRatRod I didn't do it. FABO Gold Member

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        Kevin, the converter you have will be fine. Run it and enjoy it. We all leave somethin on the table. Shit man, I built my 400 with USED CAST pistons and a cast crank. It's what I have, so I have to use it. I bought an Elgin cam ON SALE for 59 dollars. It's what I could afford. None of this engine has seen the machine shop. Would I like to have done it differently? Sure, but I couldn't. I did it how I had to, or not at all. Unless you're as blessed as some of these other guys, you have limits. I know I do. In the end though, to ME making something good again from something bad is much more rewarding than gettin the checkbook out.
         
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        • 318willrun

          318willrun Utube channel 318willrun

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          Nice Truck! I wonder what your 60 ft times of the truck would be if you had bought a 299 Hughes converter? That would be a fun comparison and thread. A recommended "off the shelf" from Hughes vs a custom built converter in something like the truck. I say custom would most likely win, but by how much in a 1/4 mile?
           
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          • oldkimmer

            oldkimmer FABO Gold Member FABO Gold Member

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            I’ve seen a small block duster pick up 3/10s and 5 mph in a quarter mile. Went from 10.60s to 10.30s. Just goes to show what a good converter can do b 4 ya. Kim
             
            Last edited: Dec 15, 2020
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            • 318willrun

              318willrun Utube channel 318willrun

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              A good custom converter for sure will provide max performance!
               
            • yellow rose

              yellow rose Overnight Sensation FABO Gold Member

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              Define max performance. That’s a serious question because that sets the parameters of the discussion.
               
            • 318willrun

              318willrun Utube channel 318willrun

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              Optimizing the potential of a build.
               
            • BVoelzke

              BVoelzke Dart Racer

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              It might have picked up more with a different converter but I trust Lenny , I really didn’t want to spend a lot of money plus there aren’t to many converters for the 518. I had the trans out to have a shift kit installed so I had him do the converter. The trucks not fast (low 15s) but it goes rounds.

              F2272F8A-06EA-4E12-AB69-A1D11C09A355.jpeg
               
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              • Jadaharabi

                Jadaharabi FABO Gold Member FABO Gold Member

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              • oldkimmer

                oldkimmer FABO Gold Member FABO Gold Member

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                • yellow rose

                  yellow rose Overnight Sensation FABO Gold Member

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                  In what respects? ET? How it drives? Both? Neither?

                  Making a decision as you first asked is largely based on what your expectations (optimization, potential etc) are and how you define them.
                   
                • Jadaharabi

                  Jadaharabi FABO Gold Member FABO Gold Member

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                  • oldkimmer

                    oldkimmer FABO Gold Member FABO Gold Member

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                    It may be worth a shot. The 764 is a durable converter from the factory. This will be a core that was cut apart, then checked and maybe some parts replaced then re welded. Just changing to bearings from thrust washers will up the stall speed. U can have ur core rebuilt in the big city as most big places have converter rebuilders. Kim
                     
                  • 318willrun

                    318willrun Utube channel 318willrun

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                    yes, to all of it when speaking of Max Performance. But my point has been, when building "dirt road budget build" vehicle, and parts or being thrown at it and continued to be thrown at it, a custom converter isn't optimal for the budget because the changes would be enough to warrant "another custom" converter.
                     
                    Last edited: Dec 15, 2020
                  • flyfish

                    flyfish C8H18+N2O = :-D

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                    I've only skimmed the 7 pages of this mess, but it appears that folks are talking in circles. To your point made above, if you are throwing parts at a build, then it would make sense for you to just throw whatever converter you have at it, because you really don't care about maximizing your combo (ET and speed). For those of us that DO care about having a fast car, get a converter tailored to your specific combo or you will be leaving a lot of ET/speed on the table....its that simple.

                    By the way, this was posted in the RACE forum; therefore, I would suggest a custom converter everytime....if you posted this in the non-race area it might be a different story.
                     
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                    • 318willrun

                      318willrun Utube channel 318willrun

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                      I agree with your entire post. I posted it in the race forum because the project of topic was our drag truck.
                       
                    • BVoelzke

                      BVoelzke Dart Racer

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                      I have been racing for over 35 years and IMO two of the biggest performance enhancers are A better converter and steeper gears !

                      AA7157BF-702E-412C-BD53-520912083814.jpeg
                       
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                      • yellow rose

                        yellow rose Overnight Sensation FABO Gold Member

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                        Same for a performance STREET car.
                         
                      • lead69

                        lead69 hopeless car junkie

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                        To me that is a custom converter since he did it based upon the vehicle. I use a local outfit for converters all the time and they are built to spec for $250 with quality bearings etc.-no junk parts. they are great for a budget deal but when I need something more serious I have YR speed dial his guy at ptc lol. No way I could run an actual off the shelf converter after some of the nightmares I have seen/been through.
                         
                      • A body

                        A body SLO-KID

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                        I had two converters for my 727. One would go 1.34 60 about anywhere. Made the car incredibly predictable when I was running my smaller carb and intake. Went a ton of rounds with that set up. The other was on the tight side and would 60 better and grab better ETs, but was hit and miss off the launch (10.5 slick). Came in handy for heads up challenge races. Of course I threw that perfectly good combo out for a 904 trans, bigger intake and carb. While I like to be a “good” bracket racer, I also like to tweak the combo to see what’s in there :).
                         
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