What will my 68 Dart 408 run in 1/4 mile?

Discussion in 'Mopar Racers Forum' started by 68Dart500, Jun 11, 2018.

  1. 68Dart500

    68Dart500 Well-Known Member

    Messages:
    201
    Likes Received:
    123
    Joined:
    Oct 24, 2017
    Location:
    Somerset, WI
    Local Time:
    8:23 AM
    Just for fun I'd like to see what people think my 68 Dart will run in the 1/4 mile? Also this will be my first time running the car and setup. My only other drag race experience is with AWD twin turbo Stealths and 3000GT VR4's.

    My setup:
    1968 Dodge Dart
    4 speed manual- 23 spline
    408 Stroker (485 hp/511 tq)
    MSD 6AL2
    Aluminum radiator
    28x12.5R15 Mickey Thompson ET Street SS on steel 15x10 rims
    All steel body
    Full interior
    Quicktime bellhousing
    Chromemoly driveshaft with 1350 joints
    Driveshaft loop
    Hydraulic Hydramax clutch with Centerforce Dual friction
    8 3/4 with Moser axles, Auburn Pro LSD, Yukon 3.55 Gears, 489 case with crush sleeve eliminator
    Xhd Mopar leaf springs
    Kyb shocks
    Stock 318 V8 torsion bars
    3 inch exhaust with turn downs at axle
    4 wheel drum brakes

    So what do we think it'll run? :)

    Also any suggestions for launch rpm? It's got a 2 step so I'll set it at the recommended rpm

    It gets dyno tuned on the 20th of this month so i hope to be out at the track within a week or two of getting it tuned.
     
    Last edited: Jun 12, 2018
  2. 604B1duster

    604B1duster Well-Known Member

    Messages:
    788
    Likes Received:
    224
    Joined:
    Dec 30, 2007
    Local Time:
    7:23 AM
    11.70s @ 117
     
    • Agree Agree x 5
    • yellow rose

      yellow rose Doctor of Thinkology.

      Messages:
      14,230
      Likes Received:
      10973
      Joined:
      Jun 19, 2015
      Location:
      Living on the razors edge
      Local Time:
      6:23 AM
      You have an assload of clutch. And no way to tune it. Your shocks leave about everything to be desired. Not sure of MT nomenclature but that looks like a radial tire.

      So your tires will hate an assload of clutch, untunable shocks and most likely a 9.45 overall first gear. That's if you have a 2.66 first gear box. If it's a 2.44 first you will have a 8.66 overall first gear which is powerglide and less first gear.

      I'd skip the two step and slide the clutch like a mutha humpa at the starting line. The last thing you will want to do is beat the crap out of the tire.

      You have enough HP to run low, low 11's if you can make the chassis happy.

      Not bashing your stuff. It just looks to me like you've got a lot of parts that will hate each other, and really no way to tune it.
       
    • 604B1duster

      604B1duster Well-Known Member

      Messages:
      788
      Likes Received:
      224
      Joined:
      Dec 30, 2007
      Local Time:
      7:23 AM
      17ECD174-85BB-4299-A41A-6603D6BDCFBF.jpeg I thought I read ST not SS.
      I think this is the tire he has, it’s bias ply
      Might hook after all
       
    • 1963dartgt

      1963dartgt Well-Known Member

      Messages:
      500
      Likes Received:
      141
      Joined:
      Nov 7, 2015
      Location:
      CA
      Local Time:
      8:23 AM
      I dont know how fast you'll go, I just hope you can stop with those drums.
       
      • Agree Agree x 1
      • bOb shingler

        bOb shingler Well-Known Member

        Messages:
        3,250
        Likes Received:
        151
        Joined:
        Jun 8, 2007
        Location:
        warrenton, north carolina
        View My Photos
        Local Time:
        9:23 AM
        12.80
         
        • Like Like x 1
        • roccodart440

          roccodart440 Well-Known Member

          Messages:
          4,663
          Likes Received:
          3666
          Joined:
          Apr 19, 2010
          Local Time:
          9:23 AM
          the gears are going to be the biggest problem.

          I have a similar combo with an overdrive. I have 4.56 gears. I run low 11.70@114 in 3rd, 12.20's in OD.

          I'm guessing you'll go 12's
           
        • 68Dart500

          68Dart500 Well-Known Member

          Messages:
          201
          Likes Received:
          123
          Joined:
          Oct 24, 2017
          Location:
          Somerset, WI
          Local Time:
          8:23 AM
          These are the tires I've got:
          Mickey Thompson 3454: ET Street S/S Radial Tire P295/55R15 | JEGS

          I was going to go with a bias ply but I was afraid of the tire growing with how close I am to my front wheel well opening.

          I did just order a disc brake setup for the car but it came in with some wrong parts so I returned it and I',m on the hunt for a new disc brake conversion kit. Ideally I'd like to find one and get it installed before I take it to the track next month.


          When you say slide the clutch you mean feather it and let is slip at the line a little or are you meaning dump it at like 5k rpm? Are there clutches you can tune/adjust?

          Mines the 2.47 gear set for my A833 (3 groove gears)
           
          Last edited: Jun 12, 2018
        • 451Cuda

          451Cuda Well-Known Member

          Messages:
          1,672
          Likes Received:
          365
          Joined:
          Nov 19, 2008
          Location:
          Port-aux-Français, TF
          Local Time:
          8:23 AM
          low 12s to high 11s at 115-120
           
          • Agree Agree x 1
          • 604B1duster

            604B1duster Well-Known Member

            Messages:
            788
            Likes Received:
            224
            Joined:
            Dec 30, 2007
            Local Time:
            7:23 AM
            Get a wilwood kit for either 9 or 10 in drum, whichever you have.
             
            • Agree Agree x 1
            • roccodart440

              roccodart440 Well-Known Member

              Messages:
              4,663
              Likes Received:
              3666
              Joined:
              Apr 19, 2010
              Local Time:
              9:23 AM
              How close is the tire to the well? You can space it back.

              They don't grow as much as you think
               
            • 68Dart500

              68Dart500 Well-Known Member

              Messages:
              201
              Likes Received:
              123
              Joined:
              Oct 24, 2017
              Location:
              Somerset, WI
              Local Time:
              8:23 AM
              Do you need to switch to 15's for a Wilwood kit? I saw Wheel Vintiques had the 15x3.5 steel dog dish rims for sale but they are like 208 bucks a piece!

              I can't say for sure because I just finished painting the rims so the tires will be getting mounted in the next day or two but from preliminary measuring it looks like it'll be very close. If I were going to get a bias ply what kind are most people running in a 28x12.5R15 or something similar in size? This car will be 85% street driven and 15% track.
               
            • 604B1duster

              604B1duster Well-Known Member

              Messages:
              788
              Likes Received:
              224
              Joined:
              Dec 30, 2007
              Local Time:
              7:23 AM
              I was looking at those wheels(15x4). and center bore is only 2.875, not positive but I think you need 3in with wilwood, be careful what you order. BTW nice looking dart, great color combo
               
              • Thanks! Thanks! x 1
              • 1963dartgt

                1963dartgt Well-Known Member

                Messages:
                500
                Likes Received:
                141
                Joined:
                Nov 7, 2015
                Location:
                CA
                Local Time:
                8:23 AM
                • Like Like x 1
                • mbaird

                  mbaird mbaird FABO Gold Member

                  Messages:
                  3,447
                  Likes Received:
                  913
                  Joined:
                  Dec 10, 2005
                  Location:
                  boise, Id
                  Local Time:
                  7:23 AM
                  I ran an O.D 833 in Dart Sport and loved it ! 4.10s and I could cruise the hwy then race 1-3... cut some 1.60 60fts and high 12s with a mild 340 build.
                  90% Street driving so I didnt mind the 1-2 gap.
                   
                  • Like Like x 2
                  • roccodart440

                    roccodart440 Well-Known Member

                    Messages:
                    4,663
                    Likes Received:
                    3666
                    Joined:
                    Apr 19, 2010
                    Local Time:
                    9:23 AM
                    YOu can easily shim the front shackle.

                    My favorite street tires are sportsman pros. Bias ply, good in the rain, great traction on the street and at the strip.

                    I run them tubeless at 25 street, 18 strip.
                     
                    • Like Like x 1
                    • 68Dart500

                      68Dart500 Well-Known Member

                      Messages:
                      201
                      Likes Received:
                      123
                      Joined:
                      Oct 24, 2017
                      Location:
                      Somerset, WI
                      Local Time:
                      8:23 AM
                      My springs were moved into my frame when I mini tubbed it so I can't shim the front mount. Hopefully I'll just be happy with my radial tires and I won't need to worry about a tire change just yet. My wife might not be too happy if I tell her my brand new tires need to be replaced :elmer:
                       
                    • 604B1duster

                      604B1duster Well-Known Member

                      Messages:
                      788
                      Likes Received:
                      224
                      Joined:
                      Dec 30, 2007
                      Local Time:
                      7:23 AM
                      Lol
                       
                    • 604B1duster

                      604B1duster Well-Known Member

                      Messages:
                      788
                      Likes Received:
                      224
                      Joined:
                      Dec 30, 2007
                      Local Time:
                      7:23 AM
                      Be careful if you run it with front drums.
                      I ran 12.0s with front drums and didn’t have a problem, but sometimes they try to put you in the ditch.
                       
                    • mbaird

                      mbaird mbaird FABO Gold Member

                      Messages:
                      3,447
                      Likes Received:
                      913
                      Joined:
                      Dec 10, 2005
                      Location:
                      boise, Id
                      Local Time:
                      7:23 AM
                      I am doing a near identical build right now using a solid roller and W2s.
                      Seems like a pretty wide Drag Radial. Not sure what will happen if you dead hook ?
                      Stopping wont be a problen since you run a 4 speed and can use the gears to decellerate.
                      I plan on running a 245/60 15 SS radial due to space limitations.
                      Looking forward to hearing how yours works out.
                       
                    • yellow rose

                      yellow rose Doctor of Thinkology.

                      Messages:
                      14,230
                      Likes Received:
                      10973
                      Joined:
                      Jun 19, 2015
                      Location:
                      Living on the razors edge
                      Local Time:
                      6:23 AM


                      Yes, feather it. I doubt you can drop the clutch at any RPM and not have an issue.

                      There are adjustable clutches out there. For you, I'd suggest looking into the clutch tamer. Guy on here makes them. You can at least control the application of the clutch with it and IIRC they ain't too expensive. The guy goes by weed burner on here but if you google clutch tamer you can find him.


                      That overall first gear is a tough nut to crack. Like I said...you have a first gear that is very tall. I make less power than you and I have a 14.09:1 first and could probably use a bit more. With a 2.47 you have an 8.77 first gear. Just getting a 2.66 first gear box would give you a 9.44 first and that's better than what you have.

                      You picked a tough combo to tame.
                       
                    • mbaird

                      mbaird mbaird FABO Gold Member

                      Messages:
                      3,447
                      Likes Received:
                      913
                      Joined:
                      Dec 10, 2005
                      Location:
                      boise, Id
                      Local Time:
                      7:23 AM
                      I will be running a 3.09 1st and 3.91s.
                      Clutch tamer is a good idea which combined with your 2 step msd would help launch.

                      Anyone can run an auto... it takes a real Masochist to run a 4speed ...lol
                       
                      • Like Like x 1
                      • roccodart440

                        roccodart440 Well-Known Member

                        Messages:
                        4,663
                        Likes Received:
                        3666
                        Joined:
                        Apr 19, 2010
                        Local Time:
                        9:23 AM
                        CHeck out the RMS mini tub front shackles. See if you have enough meat to do something like that. I used them on my current car. They allow the rear to be moved up or down, front or back 1.5"

                        4 holes instead of 2.
                         
                      • MichaelB.

                        MichaelB. Well-Known Member

                        Messages:
                        167
                        Likes Received:
                        114
                        Joined:
                        Mar 29, 2008
                        Location:
                        Central US of A
                        View My Photos
                        Local Time:
                        8:23 AM
                        Its just a guess (and you will need to be a hell of a shifter) but I am rooting for you...

                        11.20 @115
                         
                      • 68Dart500

                        68Dart500 Well-Known Member

                        Messages:
                        201
                        Likes Received:
                        123
                        Joined:
                        Oct 24, 2017
                        Location:
                        Somerset, WI
                        Local Time:
                        8:23 AM
                        Thanks for all the tips and suggestions so far folks. I'm starting to wonder if I should exchange my radial ET Street SS tires for some bias ply MT sportsman Pro ET tires (2 ply wrinklewall)? I talked to summit and being I haven't mounted my other tires onto the rims yet (that was going to happen this week) they said I could exchange them. Thoughts? It looks like I'd need to run tubes then as well and drill out my valve stem hole to 5/8.

                        Here's the tire: Mickey Thompson Sportsman Pro Tires 90000000208
                         
                        • Like Like x 1