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Thread: Some timing questions

  1. #1
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Some timing questions

    A hypothetical question...
    For example, an "Advance from Map Warm Full' reading of 14.7 psi might show a reading of minus 14.8 degrees of advance on the table. In which table does this minus 14 degree's adjust timing? Does it pull timing out of "Advance from Rpm" or from" Advance from Rpm Max" or some other factor?

    What affect does setting limits in the table "Advance from Rpm Max" have on the tune?

    Thanx!
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

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    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Some timing questions

    There are different timing tables which work together for a total timing value. The advance from RPM max limits the timing from rpm if I'm not mistaken. There are a couple of values which help to limit your timing, especially the multiplier in the later stuff. If you haven't yet, you should look at the total timing calculations in MP tune to get an idea of what's really going on given RPM and boost.

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    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: Some timing questions

    Are you referring to the graphic display in calculated tables?
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

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    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: Some timing questions

    Under full throttle Advance from Rpm simulates mechanical advance. That advance would go to a certain degree of advance, for example 38 degrees all in. My guess is that Advance from Map Warm Full subtracts the degrees from AFRPM to reduce timing under boost to prevent detonation. Is that correct?
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

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    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Some timing questions

    Quote Originally Posted by jeff1234 View Post
    Are you referring to the graphic display in calculated tables?
    Yes. There is also the matrix which shows the values. I generally look at that.

    Quote Originally Posted by jeff1234 View Post
    Under full throttle Advance from Rpm simulates mechanical advance. That advance would go to a certain degree of advance, for example 38 degrees all in. My guess is that Advance from Map Warm Full subtracts the degrees from AFRPM to reduce timing under boost to prevent detonation. Is that correct?
    I'd have to look at it. To be honest with you, I generally just adjust the Part throttle and Full throttle timing tables for the most part.

  6. #6
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: Some timing questions

    Cordes
    I looked at the psi/rpm chart. Are the numbers in the boxes, timing in degree's? If so, do you change the numbers to adjust timing or do you change them by moving the points on the lines in the individual graphs?
    Jeff
    Last edited by jeff1234; 04-03-2019 at 10:14 AM.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

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    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Some timing questions

    That is the total timing at that RPM and boost level. You change the individual timing tables and multipliers to effect the visual you see in the table.

  8. #8
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: Some timing questions

    Thanx much Cordes.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

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