Predict my 1/4 mile time

Racers Hangout

  1. gtxracer

    gtxracer FBBO Gold Member FBBO Gold Member

    Messages:
    860
    Likes Received:
    500
    Joined:
    Nov 24, 2011
    Location:
    Lake Stevens, Washington
    Local Time:
    8:36 AM
    Gary, I'd like to add, that those M/T Pros with the 5.13 gears might be hard pressed to 60ft like a 10 second ride. Based on my experience with the same ratio many years ago. My thoughts.
    Bob :moparsmiley:
     
    • Like Like x 2
    • 66Satellite47

      66Satellite47 FBBO Gold Member FBBO Gold Member

      Messages:
      2,840
      Likes Received:
      1830
      Joined:
      Jan 15, 2015
      Location:
      St Paul MN
      Local Time:
      9:36 AM
      It takes torque & power with a GOOD suspension to do 10 second 60 ft times. 5.13 is deep, but you can get way down in the 12's without a ton of power & a deep gear. A 4.10 or so would be a better choice I'd think.
       
    • Dibbons

      Dibbons Well-Known Member

      Messages:
      2,216
      Likes Received:
      1369
      Joined:
      Nov 29, 2014
      Location:
      La Paz, B.C.S., Mexico
      Local Time:
      9:36 AM
      First pass should be 13.5 ET then fine tune it from there ...
       
    • 79cordoba

      79cordoba Well-Known Member

      Messages:
      49
      Likes Received:
      41
      Joined:
      Aug 17, 2014
      Location:
      Fox lake illinois
      Local Time:
      10:36 AM
      Hey guys sorry it's been a while but first pass off the trailer 12.9 best was 12.83 @ 103.3 it wa 90 degrees outside. I plan to go 3 inch exhaust with x pipe from 2.5 with H and go back to track on a cooler day hoping to improve times. 60 foot was 1.76. car now has 4.10 gears. Also went 31 x 16.5 mickey T.
       
      • Thanks! Thanks! x 2
      • dvw

        dvw Well-Known Member

        Messages:
        4,099
        Likes Received:
        5380
        Joined:
        Feb 16, 2010
        Location:
        waterford mi
        Local Time:
        11:36 AM
        If it only runs 103 it probably has a hydraulic purple shaft. No way it needs the Victor intake. Performer RPM would be a far better choice. 3800 stall for a dedicated drag car is low as well. Lets the time slip.
        Doug
         
      • 79cordoba

        79cordoba Well-Known Member

        Messages:
        49
        Likes Received:
        41
        Joined:
        Aug 17, 2014
        Location:
        Fox lake illinois
        Local Time:
        10:36 AM
        It is a purple shaft hydraulic I don’t know which one my guess is 509. I switched to a torker II intake port matched and flow benched. Not dedicated drag car, street strip.

        FE2C1669-9CAB-4214-ABB3-E316A52C769A.jpeg
         
      • BSB67

        BSB67 FBBO Gold Member FBBO Gold Member

        Messages:
        681
        Likes Received:
        544
        Joined:
        Jan 18, 2018
        Location:
        PA
        Local Time:
        11:36 AM

        Hope your not looking for an improvement in going from 2 1/2 to 3" exhaust on a 103 mph car. I guess the exception could be if you have an internal collapsed muffler. But if so, just replace it.
         
        • Agree Agree x 1
        • 79cordoba

          79cordoba Well-Known Member

          Messages:
          49
          Likes Received:
          41
          Joined:
          Aug 17, 2014
          Location:
          Fox lake illinois
          Local Time:
          10:36 AM
          I don’t expect for it to put me in the 11’s but it’s not gonna hurt. I’m just doing cheap / easy things while I save for aluminum heads .
           
        • BSB67

          BSB67 FBBO Gold Member FBBO Gold Member

          Messages:
          681
          Likes Received:
          544
          Joined:
          Jan 18, 2018
          Location:
          PA
          Local Time:
          11:36 AM
          Based on what you described, the car should be faster. I would maybe find out why before making changes that are not the problem.
           
        • 66Satellite47

          66Satellite47 FBBO Gold Member FBBO Gold Member

          Messages:
          2,840
          Likes Received:
          1830
          Joined:
          Jan 15, 2015
          Location:
          St Paul MN
          Local Time:
          9:36 AM
          Didn't see what stock heads you have, but there is a lot of ET & MPH in inexpensive basic porting on a stock head. I did my own porting on my 1st set of 906's, went from 12.30/111 to 11.90/116+. Just bowl work, taking out the lip. Today a good "perf machine shop can do better with a deep cut valve job. A couple more porting efforts produce 11 teens/120. 440, 11.5 actual CR, .585 solid cam. The basic porting gives you much better performance on both street & strip, no negatives. Exhaust won't get you much if anything with your combo, it's not that cheap either.
           
        • 79cordoba

          79cordoba Well-Known Member

          Messages:
          49
          Likes Received:
          41
          Joined:
          Aug 17, 2014
          Location:
          Fox lake illinois
          Local Time:
          10:36 AM
          cost me 160$ and the car had to much drone when crusing, I guess I shouldn't have posted in the racing section.. I have bone stock 906 heads I think. not wasting time and or money on them just saving for either 440 source or edlebrock heads
           
        • BSB67

          BSB67 FBBO Gold Member FBBO Gold Member

          Messages:
          681
          Likes Received:
          544
          Joined:
          Jan 18, 2018
          Location:
          PA
          Local Time:
          11:36 AM
          You're good posting here. Anyone that goes to the track and cares about performance should post here, IMO.
           
          • Agree Agree x 4
          • cdr

            cdr Well-Known Member

            Messages:
            1,436
            Likes Received:
            1178
            Joined:
            Jun 26, 2011
            Location:
            katy tx
            Local Time:
            10:36 AM
            As BSB67 said, you are in the correct place, keep posting!!!
             
            • Like Like x 1
            • 440rb

              440rb Member

              Messages:
              12
              Likes Received:
              6
              Joined:
              Sep 27, 2018
              Location:
              UK
              Local Time:
              4:36 PM
              The cam is the killer here not knowing, could be a .484 hyd. or a .590 sft cam...night and day difference.

              I ran a 3300lbs race car with a stock 6-pk bottom end..9.8:1....stock 906's, team G/850DP and that motor made an on track 450fwhp as per weight/mph, I ran the old McAndless .650", 290@.050 sft cam. I ran 4.88's/14x32's...trapped@6600/4800stall

              All I can say is if you have a decent cam and the motor makes 450fwhp with your chassis spec you could be running past 7000rpm@the stripe dependent on conv. slip.
              60 Foot E.T. : 1.67
              1/8 Mile E.T. : 7.57
              1/8 Mile Trap Speed : 89.75
              1/4 Mile E.T. : 12.00
              1/4 Mile Trap Speed : 112
              1/4 Mile Trap RPM : 6,757+?
               
            • BSB67

              BSB67 FBBO Gold Member FBBO Gold Member

              Messages:
              681
              Likes Received:
              544
              Joined:
              Jan 18, 2018
              Location:
              PA
              Local Time:
              11:36 AM
              ???. Car has a 4.10
               
            • 440rb

              440rb Member

              Messages:
              12
              Likes Received:
              6
              Joined:
              Sep 27, 2018
              Location:
              UK
              Local Time:
              4:36 PM
              ok so if you drop 4.10's in it you'll pull around 5500@traps+slip, (if you've got 450fwhp), good if you've got a mild cam in it, not so good if its racey, I would go 4.56 for around 6300@traps which will be better to get that weight moving.
               
            • malex

              malex FBBO Gold Member FBBO Gold Member

              Messages:
              1,578
              Likes Received:
              1926
              Joined:
              Aug 10, 2013
              Location:
              Canada
              Local Time:
              10:36 AM
              12.7's to 12.9's. Aside from the unknown on the cam, what about valve springs, running the 1/4 with 5.13's..
               
              • Agree Agree x 1
              1. This site uses cookies to help personalise 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.