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Thread: twin turbo 415 sbc timing

  1. #11
    bonedaddy Guest

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    Thanks i will let you know what happens

  2. #12
    bonedaddy Guest

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    do i need to to add 14.7 for the map sensor on the boost retard curve on the 7535? I see nothing in the instructions to do so

    I had to do it on the boost psi curve on the 7562

    thanks

  3. #13
    msdtech21 Guest

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    Quote Originally Posted by bonedaddy View Post
    do i need to to add 14.7 for the map sensor on the boost retard curve on the 7535? I see nothing in the instructions to do so

    I had to do it on the boost psi curve on the 7562

    thanks
    Yes you need to add in barometric pressure. The best way to figure it out is to turn the ignition on without starting the engine. Connect the laptop to the MSD Digital 7. The red line in the Boost retard curve will move somewhere between 12.5-14.75psi depending on altitude. This would be your zero point if you were looking at a mechanical boost gauge.

  4. #14
    bonedaddy Guest

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    first this is a blow through take the hose to the map sensor before or after the carb? and is this map right 20 psi take out 10* ?
    Attached Files Attached Files

  5. #15
    msdtech21 Guest

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    Quote Originally Posted by bonedaddy View Post
    first this is a blow through take the hose to the map sensor before or after the carb? and is this map right 20 psi take out 10* ?
    Just T it off of the boost gauge. That'll solve your plumbing question. And yes that is right on the boost retard curve.

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