Timing retard

Discussion in 'Electrical and Ignition' started by mopowers, Mar 20, 2017 at 3:04 PM.

Discuss Timing retard in the Electrical and Ignition area at forabodiesonly.com.

  1. mopowers

    mopowers Well-Known Member

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    Is it true that Standard Mopar orange boxes pull out timing under high load? What about standard parts store 4-pin HEI modules?
     
  2. ktcnn94

    ktcnn94 Well-Known Member

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    :popcorn: I'm curious also. I've heard this but unfortunately have not researched it. Maybe trailbeast with chime in, he's probably up on it.
     
  3. Mark2205

    Mark2205 Well-Known Member

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    No, I don't think the orange box pulls timing out under load. It doesn't know whether your engine is under load or not. The only input it gets is from the reluctor wheel in your distributor. Now i have seen the initial timing will change between boxes.
     
    Last edited: Mar 20, 2017 at 4:11 PM
  4. KitCarlson

    KitCarlson FABO Gold Member FABO Gold Member

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    That is done in a way, by the vacuum advance. Under full load vacuum drops to near zero, so no advance. Under light load, high vacuum so more advance. Closed throttle drops vacuum, under coast, and idle that is good thing.

    Ignitions with micro controller and MAP/vacuum sensing port, typically control timing with load, but usually with user configurable tables. No micro in orange box, nor a way to sense load.
     
  5. mopowers

    mopowers Well-Known Member

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    I called FBO today and ordered one of his limiter plates for my dad's 360 and he was telling me that the orange mopar ECUs and parts store HEI modules pull timing out in high load situations due to them being tranisterized. That kinda stuff is over my head, so I figured I'd see if there's any truth to it.
     
  6. KitCarlson

    KitCarlson FABO Gold Member FABO Gold Member

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    I have heard the term :"pull out dwell", associated with FOB ignition. But like nearly any single coil ignition, at high RPM, dwell time decreases.