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suspension changes for drag radials

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  • suspension changes for drag radials

    I have a 66' mustang with mono-leafs, caltracs and QA1(single adj.) on the rear and was wondering what, if anything, I should expect to do to the suspension going from 28x10.5x15 ET Drags to 275x60x15 MT radials. Also, what tire pressure should I start off with? Do I need less or more pre-load in the caltracs? Stiffer or looser shock seting becasue of the stiff sidewall of the radial? Just trying to get some idea before I test the end of the month.

    For the ET Drags I have 1 turn pre-load in each side, QA1 on 3, air pressure @ 13-14

    Thanks,
    Jason
    66' stang
    408W, 12.5cr, victor jr heads & manifold, hydr. roller cam, 825 mighty demon, C4 4,000 stall, 9 inch w/4.11 gears, RCI headers, caltracs, kirkey racing seats

    11.45 @116mph, 1.55 60' @ 5,800 (all motor)
    10.54 @128mph, 1.43 60' @ 5,800 (100 N2O)
    10.24 @130mph, 1.35 60' @ 5,800 (200 N2O)


    "GO FAST, TAKE CHANCES"


    "JUST TRYING TO GO 9'S IN THE THIN AIR"

  • #2
    Key to the drag radials is to soften the "hit". On a nitrous car most guys use those timers that ramps up the nitrous.

    Usually less preload on the caltracs.

    Question: your chassis dyno numbers in your signature, is that on the bottle?
    68 Mustang coupe NMCA Mean Street
    347 NA @3100lbs
    best so far: 10.52@125 with 1.43 60' on goodrich 275-15 drag radials looking for 10.20's!
    67 mustang 11-teens with 351W/C9OE heads and rusted out floor pan
    69 torino gt 351C 4sp
    78 F150 460 running low 14's
    02 powerstroke

    Comment


    • #3
      no thats all motor on an all wheel drive dyno. I haven't dynod it with the nitrous.

      Jason
      66' stang
      408W, 12.5cr, victor jr heads & manifold, hydr. roller cam, 825 mighty demon, C4 4,000 stall, 9 inch w/4.11 gears, RCI headers, caltracs, kirkey racing seats

      11.45 @116mph, 1.55 60' @ 5,800 (all motor)
      10.54 @128mph, 1.43 60' @ 5,800 (100 N2O)
      10.24 @130mph, 1.35 60' @ 5,800 (200 N2O)


      "GO FAST, TAKE CHANCES"


      "JUST TRYING TO GO 9'S IN THE THIN AIR"

      Comment


      • #4
        Hmm
        I just dynoed my car a couple weeks ago and came up with 370 peak hp. Cars running 10.50's at 3100lbs, I'm wondering if the dyno was stingy. What was your best all motor ET at that HP
        (Sorry for the hi-jack!)
        68 Mustang coupe NMCA Mean Street
        347 NA @3100lbs
        best so far: 10.52@125 with 1.43 60' on goodrich 275-15 drag radials looking for 10.20's!
        67 mustang 11-teens with 351W/C9OE heads and rusted out floor pan
        69 torino gt 351C 4sp
        78 F150 460 running low 14's
        02 powerstroke

        Comment


        • #5
          My best ET n/a was 11.51 @116. But I live in denver and race @ bandimere, elevation of 5,800ft and usually a DA above 9,000ft
          66' stang
          408W, 12.5cr, victor jr heads & manifold, hydr. roller cam, 825 mighty demon, C4 4,000 stall, 9 inch w/4.11 gears, RCI headers, caltracs, kirkey racing seats

          11.45 @116mph, 1.55 60' @ 5,800 (all motor)
          10.54 @128mph, 1.43 60' @ 5,800 (100 N2O)
          10.24 @130mph, 1.35 60' @ 5,800 (200 N2O)


          "GO FAST, TAKE CHANCES"


          "JUST TRYING TO GO 9'S IN THE THIN AIR"

          Comment


          • #6
            Originally posted by JJonesy99 View Post
            I have a 66' mustang with mono-leafs, caltracs and QA1(single adj.) on the rear and was wondering what, if anything, I should expect to do to the suspension going from 28x10.5x15 ET Drags to 275x60x15 MT radials. Also, what tire pressure should I start off with? Do I need less or more pre-load in the caltracs? Stiffer or looser shock seting becasue of the stiff sidewall of the radial? Just trying to get some idea before I test the end of the month.

            For the ET Drags I have 1 turn pre-load in each side, QA1 on 3, air pressure @ 13-14

            Thanks,
            Jason
            Leave everything alone except for the shocks.
            Set them at one from zero on the left and 2 on the right.
            sigpic

            Alex Denysenko
            Co-Administrator

            NHRA/IHRA/NMCA member and licensed Superstock driver
            NHRA and IHRA SS/LA & SS/MA National Record Holder 99','00,'01,'02,'03,'04,'05 & '06
            First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
            First SS/MA in the TENS 04-03
            5 time IHRA division 5 Superstock Champion
            Fleet of FoMoCo products including 88 ASC McLaren Mustang #28

            The Barry of BarrysGrrl

            Quote #1: "I never met a magazine mechanic I liked."
            Quote #2: "Make sure brain is in gear before engaging mouth!"
            Quote #3: "If you can't run with the big dogs, stay on the porch!"
            Quote #4: "Go fast or go home!"
            Quote#5:" No Brag,Just Fact!"
            www.moneymakerracing.com

            Comment

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