What to do...

Mopar Racers Forum

  1. Toluene56

    Toluene56 Well-Known Member

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    Cam is Howards Solid Roller - 257/267@050 .640/.645 .022 lash hot
    Below 32 and I lose a mph.. above 32 and it gains nothing. 32-34 is no difference except the starter doesn't like it, that extra 2degrees is guess is it's limit.
    With the 10degree bushing and the lightest springs, it mph'd 117.6. Only change was the front shocks and locked the timing at 32, 118.6 on pretty much all passes not including the aircleaner pass. low and mid do seem to run MUCH smoother with the distributor locked out.
     
  2. PRH

    PRH Well-Known Member

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    I’m not suggesting a change....... just saying......
    And especially at that elevation...... the motor really doesn’t need a cam with 10* split.
    If it’s hooking really well, to the point where you could put extra tq at the hit to good use...... a single pattern would likely 60’ better.

    Have you done the rolling high gear flash stall test?
    If so..... what does it flash too?

    Have you done a cranking pressure test?
     
  3. Toluene56

    Toluene56 Well-Known Member

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    High gear rolling flash is around 4800ish
    Since I added the thicker head gaskets havent done the compression test. But before with 12.2:1 same everything else 170-180s with a hot 7k + day.

    I just picked out the cam trying to sort out the combo. I was thinking about a single pattern since these trickflows flow a good bit more exhaust wise then the cncd speedmasters that I used to have on it.
     
  4. yellow rose

    yellow rose Master Of Insanity

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    With it locked out there is a great probability the ignition retards with RPM. At that DA, I doubt retard is a good thing.

    And they ALL retard. How much and at what RPM has to be tested. But they all do it.
     
  5. Toluene56

    Toluene56 Well-Known Member

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    I did rev it up to about 4000 or so and it stayed rock steady with the timing light.. but thats not to say that it doesn't do it higher up, or act differently while the car is loaded. But I did notice with the advance installed it was kinda steady (little bouncy).
     
    Last edited: Jun 28, 2020
  6. Toluene56

    Toluene56 Well-Known Member

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    Well... Changed the settings on the rear shocks toato #5 added 1 flat preload on both sides for the caltracs. 16psi on the hoosiers
    6,942ft DA
    11.358@118.4 (1.590 60ft)
    6500ft DA
    11.375@118.96 (felt like it spun ever so slightly 1.595 60ft)
     
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    • yellow rose

      yellow rose Master Of Insanity

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      Remind me what RPM you’re shifting and what shocks you have.

      Thanks
       
    • Toluene56

      Toluene56 Well-Known Member

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      Shift right at 7000

      Fronts CE 3 way set at 90/10
      Rears rancho 9000s single adjustable
       
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      • PRH

        PRH Well-Known Member

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        To put your stall speed into perspective......

        When I had my car running 10’s with a 9.7:1 906 headed 440 running a UD roller that was 259/264-108....... 4.56 gears and 29.5” bias slicks....... the converter would flash to 5300.
        Shift about 6400, through the lights about 67-6800.

        If it really hooked, which def wasn’t guaranteed with my old SS springs, it would 60’ 1.46-1.50...... but there were also a lot of 1.51-1.56 60’s in there as well.

        If I had that combo at 5000’, I can see where it would have needed more stall.

        My stock 906 headed 383 used a converter with 5400 stall.

        The converter in my friends stocker GTO was 5500(1.50 60’ at 3650lbs, 406ci with heads that flow 212).

        But...... you’re chipping away at it:thumbsup:
         
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        • B3422w5

          B3422w5 Well-Known Member

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          Can anybody calculate what those 11.30’s are at 1500 feet?
          I think with the correct cam and convertor your car would run real close to 11 flat at your 7000ft altitude.
          I am thinking, impressive, very impressive if you come off the mountain... lol
           
        • yellow rose

          yellow rose Master Of Insanity

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          Now I forgot if you’re running slicks or radials. I have very limited experience with radials, but I know from the little tuning I’ve done with them they like a lot more bump than a slick does.
           
        • PRH

          PRH Well-Known Member

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          The NHRA altitude adjustment factor for that track, to correct back to sea level is:
          ET - .9612
          MPH - 1.0369

          So, an 11.375@118.96 would correct to 10.933@123.34(at sea level)
           
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          • Toluene56

            Toluene56 Well-Known Member

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            Most of the bracket guys are saying I'll drop around 6-8 tenths going to sacramento raceway. Which is basically sea level. Maybe this fall I'll make the trek and run it. But I do need a rollbar and harnesses. I was warned last night.. that is counting actual DA. But I dunno I'll believe it when I see it.
             
          • B3422w5

            B3422w5 Well-Known Member

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            Wow....
            I wonder how real world that is. I have seen with various cars and combos 2000 feet make 2 tenths difference on well sorted cars.
            So 4,000 feet make 4 tenths difference of that follows..
            7000 feet difference...???
             
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            • B3422w5

              B3422w5 Well-Known Member

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              tend to agree, think you have a 10.50ish combo in “ good air” that could be a 10.20’s combo with the right cam and vert
               
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              • Toluene56

                Toluene56 Well-Known Member

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                With the da... 7tenths. Makes sense from the what the guys at the track have been saying.
                 
              • Toluene56

                Toluene56 Well-Known Member

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                Hoosiers are biasply "slicks" they have a dot stamp... But.. not really dot tire.
                 
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                • B3422w5

                  B3422w5 Well-Known Member

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                  I assume they are QTP’s?
                  Ran those forever, like them.
                  My current car i swapped them off for some Hoosier 275 drag radials, gained almost a tenth.
                  I could never get away with more than 14 pounds in my QtP’s at the track
                   
                • PRH

                  PRH Well-Known Member

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                  What 7000ft difference?
                  The track is at 3953ft.

                  The equivalent day at seal level, to a 7000ft DA day at a track where the elevation is 3953ft, would be show a DA of 3047ft.

                  If you’re at a sea level track, and the DA is 0ft...... the equivalent DA at his track is 3953ft.
                   
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                  • Toluene56

                    Toluene56 Well-Known Member

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                    Yea they're qtp. So far it was happy with the 16psi.. didn't change the pressure at all last night.
                     
                  • B3422w5

                    B3422w5 Well-Known Member

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                    got ya. Was looking at it from a DA diff of 7k feet
                     
                  • B3422w5

                    B3422w5 Well-Known Member

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                    your car is very stout. You should be very proud!
                     
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                    • Toluene56

                      Toluene56 Well-Known Member

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                      For reference.. last night during the 11.35 run it was 6942ft da... But in Sacramento at the same time the da was 2516ft...only way to see how she does it to take it down the hill and let 'er eat. Lol
                       
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                      • Toluene56

                        Toluene56 Well-Known Member

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                        24999.jpeg Forgot to post the videos in case anyone was interested.




                        Poor Honda
                         
                        Last edited: Jul 11, 2020
                      • PRH

                        PRH Well-Known Member

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                        Well, how two NHRA index classes are factored at that track are:

                        S/ST is adjusted from the normal 10.90 down to 11.30

                        S/G goes from 9.90 to 10.30
                         
                      • PRH

                        PRH Well-Known Member

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                        Just to show how even at tracks that are located near sea level, the air isn’t always great.

                        My friend was racing at a track this past weekend that’s at about 80ft elevation.
                        The DA on his weather station was about 3800ft.
                         
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