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Thread: pushing beyond limits?

  1. #1
    Junior SCH Member
    Join Date
    Apr 2010
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    19

    pushing beyond limits?

    I am running a 1200 with a 7" crank pulley and a 2.79 charger pulley. I am running dual spearco stacked 800 hp incooler cores and feeding a smallblock magnum motor stroked to 406. The car is awesome till about 4500 rpm and then it just seems to flatten out. According to my boost guage I am at 10lbs at 6000 rpm. This would suggest to me that the supercharger is still within its limits as far as air flow is concerned. What do you guys think?

  2. #2
    Junior SCH Member
    Join Date
    Sep 2008
    Posts
    35
    Welcome Dart340SC, I really like your engine bay. Stacked Spearco's ... cool.

    I wonder if you have any instrumentation on your car? It would be interesting to know what the Air/Fuel Ratio is doing, the injector duty cycle and the fuel pressure.

    If, as you say, the air is there, it must be the fuel.

    James.

  3. #3
    Junior SCH Member
    Join Date
    Apr 2010
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    19
    I am running a carb(750 quick fuel ban) I have a wideband o2 sensor and have had it on a dyno. At wot 6000 rpm its at 11.6 a/f

  4. #4
    Junior SCH Member
    Join Date
    Sep 2008
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    35
    I assume flatten out means power/torque stay at a more or less constant value. If it's not fuel what about ignition timing?

  5. #5
    Junior SCH Member
    Join Date
    Apr 2010
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    19
    I guess what I mean is it pulls like hell till about 45-4800 rpm then it just seems to stop pulling. My ignition is all msd, distributor, msd6btm, there top coil, wires and ngk plugs gapped at 35. I am not pulling any timing out and just disconnected the water/alky injection thinking maybe it was cylinder quench

  6. #6
    Junior SCH Member
    Join Date
    Sep 2008
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    35
    Are you data logging so you can see what is occouring as it flattens off? If so what is being recorded?

  7. #7
    Senior SCH Member
    Join Date
    Oct 2005
    Location
    Carroll
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    105
    How much air flow can your heads/intake support

  8. #8
    Junior SCH Member
    Join Date
    Apr 2010
    Posts
    19
    No data log, its a 72 dart with carb. Heads are stock edelbrock magnum r/ts. 2.02/1.60. comp cams 1.6 roller rockers, the cam is 288/292 501/513 mopar performance

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