HyRev 7500 ECU box

Electrical and Ignition

  1. Mattax

    Mattax Just the facts, ma'am FABO Gold Member

    Messages:
    11,278
    Likes Received:
    7140
    Joined:
    Feb 7, 2013
    Location:
    Phila. Pa
    Local Time:
    8:59 PM
    Its probably a reference to 'slew rate' which in this context is the time for all the transitor switches to operate.
    Some links for further reading if you're interested.
    drag race engine ignition systems - Speed Talk

    Mallory Unilite timing issue | Unlawfl's Race & Engine Tech | Moparts Forums

    Paired with a DC/MP tach drive distributor you'ld never see it.
     
    Last edited: Nov 9, 2018
  2. RustyRatRod

    RustyRatRod Lemmie see your b00bs. FABO Gold Member

    Messages:
    67,826
    Likes Received:
    42151
    Joined:
    Jun 7, 2010
    Location:
    Georgia
    Local Time:
    8:59 PM
    What else do you want explained?
     
  3. 68dodge

    68dodge Well-Known Member

    Messages:
    1,479
    Likes Received:
    310
    Joined:
    Jan 23, 2008
    Location:
    Armagh, Pa.
    Local Time:
    8:59 PM
    ?
     
  4. RustyRatRod

    RustyRatRod Lemmie see your b00bs. FABO Gold Member

    Messages:
    67,826
    Likes Received:
    42151
    Joined:
    Jun 7, 2010
    Location:
    Georgia
    Local Time:
    8:59 PM
    Yes, and I do not know how to explain it any better. All but the gold box retards timing at high RPM. That hasn't a thing to do with "how hot" the spark is. The reason for it is so that timing will not advance too far resulting in detonation at high RPM. But, as I said in my earlier post, if you run race gas, or have a low enough compression, the retard feature is not needed.
     
  5. mbaird

    mbaird mbaird

    Messages:
    6,662
    Likes Received:
    3395
    Joined:
    Dec 10, 2005
    Location:
    boise, Id
    Local Time:
    6:59 PM
    wow ! that's amazing !
    What cam are you running ?
    is it a stroker ?
     
    • Agree Agree x 1
    • 68dodge

      68dodge Well-Known Member

      Messages:
      1,479
      Likes Received:
      310
      Joined:
      Jan 23, 2008
      Location:
      Armagh, Pa.
      Local Time:
      8:59 PM
      Now that you have explain that, tell me how come I can put a timing light on my motor and run it to 7500 RPM with a chrome box and the timing never changes? My timing is set at full mechanical advance. You said it will retard timing, When will it, what RPM?
      Mopar design the magnetic impulse ignition systems for less frequent tune ups, increase secondary voltage, improve starting, eliminate irregular timing and dwell change with engine speeds. Not retard timing.
       
      Last edited: Nov 9, 2018
    • mbaird

      mbaird mbaird

      Messages:
      6,662
      Likes Received:
      3395
      Joined:
      Dec 10, 2005
      Location:
      boise, Id
      Local Time:
      6:59 PM
      How would you know if its changing ?
       
    • RustyRatRod

      RustyRatRod Lemmie see your b00bs. FABO Gold Member

      Messages:
      67,826
      Likes Received:
      42151
      Joined:
      Jun 7, 2010
      Location:
      Georgia
      Local Time:
      8:59 PM
      Time slips.
       
    • 68dodge

      68dodge Well-Known Member

      Messages:
      1,479
      Likes Received:
      310
      Joined:
      Jan 23, 2008
      Location:
      Armagh, Pa.
      Local Time:
      8:59 PM
      How can you say time slips now? If the weather does not change, my car will run pretty close to the same numbers.
       
    • RustyRatRod

      RustyRatRod Lemmie see your b00bs. FABO Gold Member

      Messages:
      67,826
      Likes Received:
      42151
      Joined:
      Jun 7, 2010
      Location:
      Georgia
      Local Time:
      8:59 PM
      Ok. Don't take my word for it. I really couldn't care less. This is something that's been WELL documented since the late 70s. It's not a bad thing and can actually be useful. I was simply letting yall know that those boxes DO retard high RPM timing. Do with the info as you will. I don't care.
       
      • Like Like x 1
      • mbaird

        mbaird mbaird

        Messages:
        6,662
        Likes Received:
        3395
        Joined:
        Dec 10, 2005
        Location:
        boise, Id
        Local Time:
        6:59 PM
        ok... Now you have to splain to me how a timeslip indicates ignition timing.

        68Dodge. ... do you rev your motor to 7500 without a load?
         
        • Like Like x 1
        • RustyRatRod

          RustyRatRod Lemmie see your b00bs. FABO Gold Member

          Messages:
          67,826
          Likes Received:
          42151
          Joined:
          Jun 7, 2010
          Location:
          Georgia
          Local Time:
          8:59 PM
          I've already explained all I am going to. Like I said, this is information that's been known forty plus years.
           
        • mbaird

          mbaird mbaird

          Messages:
          6,662
          Likes Received:
          3395
          Joined:
          Dec 10, 2005
          Location:
          boise, Id
          Local Time:
          6:59 PM
          I have alway understood the boxes to retard some timing ( exept gold box) . I just cant figure out how a timeslip shows it.... maybe I skimmed over that post? I will reread thread.
           
          • Like Like x 1
          • 318willrun

            318willrun Utube channel 318willrun

            Messages:
            16,125
            Likes Received:
            17776
            Joined:
            Sep 13, 2013
            Location:
            I'm here
            Local Time:
            7:59 PM
            LOL... I was throwing humor at J par - see his quote I post above yours
             
          • mbaird

            mbaird mbaird

            Messages:
            6,662
            Likes Received:
            3395
            Joined:
            Dec 10, 2005
            Location:
            boise, Id
            Local Time:
            6:59 PM
            I know... Just extending the humor....hehehe..

            Although there was a 68 Coronet AHRA car here in the NW that ran a 318 w/ w2s and a solid roller that wound out to around 7800-8000 ! In fact I have the 904 from that car in my Barracuda. It was owned by Dennis Radford in the 80s.
             
            • Like Like x 2
            • mopar head

              mopar head Well-Known Member

              Messages:
              2,985
              Likes Received:
              768
              Joined:
              Oct 21, 2008
              Location:
              Right here, can`t you see me?
              Local Time:
              8:59 PM
              Curious of what is detrimental to anything running a chrome box at lower street rpms?
               
            • cuda66273

              cuda66273 Well-Known Member

              Messages:
              251
              Likes Received:
              21
              Joined:
              May 22, 2004
              Location:
              Oregon
              Local Time:
              1:59 AM
              Ask him what the output is at 7500 RPM, we already know, we just tested the KV output from 1000 to 8500 RPM on our distributor machine.
               
            • 1Badcolt

              1Badcolt Well-Known Member

              Messages:
              1,941
              Likes Received:
              778
              Joined:
              Mar 15, 2013
              Location:
              Georgia
              Local Time:
              8:59 PM
              Mongo APPROVED
               
              • Like Like x 1
              1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                By continuing to use this site, you are consenting to our use of cookies.