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Thread: Camshaft

  1. #1
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    Default Camshaft

    Is there an outof the box cam i can run on an 86gt motor and not have to convert to mass air?

  2. #2
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    seriously?

  3. #3
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    Gie it a little more time the 86 experts aren't on yet.....
    If you blink at the end of the straight away you'll miss the twisties and what fun would that be!
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  4. #4
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    crower 15511 with 1.6 rocker.
    you will with any camshaft need to check ptv clearance

  5. #5
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    All and all, you can do anything that you want to do to a speed density car except for a large cam. Speed density requires vacuum, at least 19 inch pounds. Stock 5.0L HO cam's advertised specs are 266°/266° duration, 0.444"/0.444" lift, Iskidarian makes a cam that works well that is 252°/257° duration and .465"/.480" lift. The reason why the cam works well is that the lobe center is 112°, good for vacuum.

    I am currently running a speed density 1986 5.0 with a 65mm Accufab throttle body, a REAL Ford Cobra intake, GT40 Y heads, the cam listed above, equal length headers, a custom X-Pipe and Dynomax Ultra Flow mufflers. My fuel system is a Walboro 155 lph pump, an Accufab adjustible fuel preasure regulator and FRPP 24 pound injectors.

    The trick to running speed density is to have a cam the produces enough vacuum, and to adjust the fuel and air flow correctly. As you increase the air, you will have to increase the fuel in equal ratios to stay within the factory programming. Some will tell you that this is not possible, but it is. The best thing to do is to work with a shop that has a dyno and can read air/fuel exhaust ratios. I daily drove my 86 with this combo for over 50,000 miles without issue.

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  6. #6
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    A cam with an LSA of 114 or higher. As mentioned above the crower is one of the best bets as well as a comp XE with 114. I would change to an 87 or 88 processor. I have had pretty good luck with that combo.

    Jason

  7. #7
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    well i was gonna throw a can and a set of 4t40-p heads on this shortblock.. However i may just switch to mass air..

  8. #8

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    i use to know a guy that had a f303 cam with victor heads and intake and it was not mass air i have know idea how it was done he said he bought it that way?

  9. #9
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    SD tuning is a dying art. Problem is - it wasn't around in the mustang world long enough for people to get really good at it. There are tricks you can do to the map sensor to improve the PERCIEVED lookup tables, etc. We use to alter the O2 sensors with resistors years ago to alter computers percieved readings. Of course that doesn't have anything to do with the MAP sensor, but things can be done to it as well - like putting blockages in the vacuum line to alter the vaccuum reading. Nothing works perfect though. You may alter it at one end and still have it 'off' at the other end.

    Jason

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