What to do...

Mopar Racers Forum

  1. Toluene56

    Toluene56 Well-Known Member

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    So I've finally got to hit the track this year.

    Previous best run last year with some issues was 11.70@113 I think around 5800ft da that day.

    After some test passes and playing with timing before I ran out of tnt time.
    11.57@117.8 at 7000ft da
    1.64 60ft
    7.38 @93.6
    Shifting at 7000rpm
    27x10.50 Hoosier 4.30 gears
    4500ish stall converter (not built for the combo)
    Leaving off idle (best 60ft so far)
    Here's the catch.. I think it can go a smidge quicker. I have a feeling a new converter built for the combo would be the ticket. But that's pricey. And aside from putting it and me on a diet, anything else you folks think I could do to eek out a little quicker?

    Here's the combo as it sits
    73 dart, all steel and glass w subframe connectors. 3500lbs (more of a guess but I'm a big boy)
    Magnum 5.9 scat rotating assy 408
    11.75:1 comp
    Trickflow heads
    Super Vic intake (basic port match)
    Qft 950
    Howard's solid roller 257/267@050 .640/.645
    Loose front suspension, qa1 upper and lower control arms and strut rods
    This outing I used drilled out stock shocks, I do have a set of 3way CE shocks to use as well (had the best 60ft with them last year 1.59)
    Caltrac mono leafs rear with rancho 9000 shocks
    Not the best video of the run, but it's what I have
     
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    • Garrett Ellison

      Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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      That's some serious altitude your running at. Many racers that race consistently at over 5000 feet carry a little extra atmosphere in a big blue bottle. Nano makes a really good capped nitrous system that maintains bottle pressure through a run without any bottle heaters and the like. A 50 hp shot with one gives gains closer to a 75 shot with the consistent nitrous pressure.
       
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      • TT5.9mag

        TT5.9mag Two atmospheres are better than one

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        1.good set of adjustable rear shocks. Spend the money, they’re worth it.
        2. Better front shocks. Not as important as rears but still worth it.
        I would contact Calvert with some specs and ask they’re recomendation.
        Tune tune tune on the suspension. It seems you’ve got the engine pretty dialed just need to get the chassis to follow suit. Love your car been following it on here for a while.
         
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        • TT5.9mag

          TT5.9mag Two atmospheres are better than one

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          One more thing you probably know already, diet. Lightning the car up is the best and easiest way to make it faster.
           
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          • Toluene56

            Toluene56 Well-Known Member

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            Rings are gapped for nitrous (250+ according to the specs from icon when I gapped them)... I just wanted to see how far I can take it before adding it.
             
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            • Toluene56

              Toluene56 Well-Known Member

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              The plan is for da shocks front and rear eventually, they're expensive though. Of course I could always do rears first and stick with the cheap 3 ways up front for a while.
               
            • Blind Squirrel

              Blind Squirrel Well-Known Member

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              You say your leaving off at idle?
               
            • Toluene56

              Toluene56 Well-Known Member

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              Yea, seems to have the best 60ft. Idle is about 950-1050rpm
               
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              • Blind Squirrel

                Blind Squirrel Well-Known Member

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                I missed what rear end gear your running. If I hit my tires off idle with my 4500 stall. I'd still be spinning. But I run 4.58 gears.

                Never mind. found it. 4.30' my reading comprehension skills sometimes sucks
                 
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                • Toluene56

                  Toluene56 Well-Known Member

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                  Usually that is the case, but this test n tune they actually prepped the track for nhra national open qualifiers. So it hooked well.
                   
                • Garrett Ellison

                  Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                  I'm assuming 727 with standard gearing? What RPM are you going through the traps at?
                   
                • PRH

                  PRH Well-Known Member

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                  I’d look for a used Victor.

                  I think the SV is too big for that stall
                  speed and elevation.

                  The speed is good enough for a few tenths better ET, but the 60’ isn’t there.
                   
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                  • Garrett Ellison

                    Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                    Used Victor or Holley Strip Dominator along with tuning the suspension. The gearing calculator shows that a 4.88 gear would really make it come to life, but if your going to spray it I probably wouldn't go lower than a 4.56. Extra gears before getting the bite right would probably do nothing except to make the car go slower, though!
                     
                  • Toluene56

                    Toluene56 Well-Known Member

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                    Knew I forgot something..
                    904 w low first
                    About 6900-7000 through the traps with the 27" tire
                     
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                    • Toluene56

                      Toluene56 Well-Known Member

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                      I wonder if the trickflow intake would be any better...or maybe a ported air gap intake?.
                      I would think the air gap would help the low end but then Peter out up top.
                       
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                      • TT5.9mag

                        TT5.9mag Two atmospheres are better than one

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                        A dual plane would be a step backwards with a 4500 stall and that cam. If this were my car I would put more converter in it, a good set of rear adjustable shocks, and start thinking about a trans brake. Get it to leave on the converter and hook and it will ET better. Where is peak torque? Have you had it on a dyno?
                         
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                        • Toluene56

                          Toluene56 Well-Known Member

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                          I figured it was a step backwards.. no dyno.. converter is planned.. mainly because I want one that will handle nitrous. But I will say it feels like it will pull Past 7000rpm.. I just ran out of time to up the rpm in increments. Plus 7k + makes me nervous lol
                           
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                          • Garrett Ellison

                            Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                            If it feels like it will keep pulling to 7500 and you modified the oiling system to keep up with it, then I would try a 4.56 gear (may seem small, but drops close 15 mph off your shift points. The base Victor 340 is probably the best manifold to get unless you want to get a strip dominator or an MP single plane and fill the carburetor pad in from a spread bore to a square bore pattern. The trick flow looks a whole lot like the super victor to me. It’s a little more “Street“ than “Strip“, but I sorta like an old Weiand 7510, too. Basically a large plenum accelerator. They’re almost impossible to find now, but I’ve known of a few fast drag cars that have used one.
                             
                          • TT5.9mag

                            TT5.9mag Two atmospheres are better than one

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                            @Garrett Ellison do you think he should change gearing with the future plans of adding nitrous? Im not a nitrous guru but my first thought is no. Stick with the 4:30 and try it. I’m under the impression that the nitrous combo will want a lower gear. But I’ve never gone really fast on gas.
                             
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                            • abdywgn

                              abdywgn dismantler

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                              short shift first gear?
                               
                            • mini

                              mini Small Bore Long Stroke

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                              For the altitude I think you are fine. Wallace says at 1200ft that time should be around 10.6 10.7
                               
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                              • Garrett Ellison

                                Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                                Correct! I think suspension tuning and a nitrous specific converter that the extra cylinder pressure won't "blow through" is the next step if that is the intention for the car. A nitrous specific converter usually has to be tight enough that it won't stall effectively for running naturally aspirated. If the 4500 rpm stall converter has anti ballooning plates and is acting tight, I'd get the suspension ready and put a system on it. I'd probably keep the SV intake, too, the torque it leaves off the line may make the hit a little softer when the spray comes in.
                                 
                              • Toluene56

                                Toluene56 Well-Known Member

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                                That was my original thought with the sv and nitrous... Although I'm not sure the converter has antibalooning plates in it. I didn't really wanna take the chance with a large hit.
                                 
                              • Garrett Ellison

                                Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                                Definitely not, Lol! What's the converter diameter and brand? Many of the nine inch or smaller converters have an anti-ballooning as standard equipment.
                                 
                              • Toluene56

                                Toluene56 Well-Known Member

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                                I believe it is a 9" dynamic.. made about 12 ish years ago..was never used and came with another car. So I used it in mine. Lol
                                 
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