Another 8973 question.

Discussion in 'PSI Superchargers Tech Questions' started by Bennett, Mar 4, 2011.

  1. Bennett

    Bennett New Member

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    Will the 8973 box work without a crank trigger?

    Thanks ITA!
     
    #1
    Bennett, Mar 4, 2011
  2. Scouder

    Scouder New Member

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    Absolutely. Hooks right up, cabling included in the kit. Nothing difficult.

    -Brian
     
    #2
    Scouder, Mar 4, 2011
  3. Danny Humphreys

    Danny Humphreys Member

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    8973

    But, your timing will still jump around just like it does now.
     
    #3
    Danny Humphreys, Mar 5, 2011
  4. ibaddlizzard@aol.com

    ibaddlizzard@aol.com New Member

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    nope it sure wont
     
    #4
    ibaddlizzard@aol.com, Mar 5, 2011
  5. Don Onimus

    Don Onimus New Member

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    8973

    How you figure it will jump around. Help us out here Mike C. don
     
    #5
    Don Onimus, Mar 5, 2011
  6. blownapex

    blownapex Member

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    8973

    i have the lahee timing box and it looks steady on my racepak
    is the 8973 still being sold or is it obsoleted by the 7730 grid
    duane
     
    #6
    blownapex, Mar 5, 2011
  7. badbird

    badbird New Member

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    I think hes saying if its hooked up to the mag directly its not as stable as running a crank trigger, the crank trigger is rock solid, the mag internal pick ups float around a bit
     
    #7
    badbird, Mar 6, 2011
  8. Mike Canter

    Mike Canter Top Dragster
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    I don't think it is the mag's internal pickups floating around that causes the instability they a rock solid. I believe it is all the slack in all the gears coming from the the crankshaft up to get to the mag drive unit including the mag drive unit itself that causes the timing to move around. That is why using the PSI Mag drive unit helps so much because it is better made. By moving the pickups from inside the mag down to the crank trigger bypasses all that gear slop. Now you are putting the timing light on the same source as the pickup so it is stable. The only thing that effects the timing now is torsional twist of the crankshaft while under power and if you have a ignition timing recorder on your Racepak you can see that.

    And yes the 8973 is still being sold. (for now).
     
    #8
    Last edited: Mar 6, 2011
    Mike Canter, Mar 6, 2011
  9. badbird

    badbird New Member

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    should have been clearer
    of cource the mag pick up is rock solid inside the magnito,
    as mike says its the gears fromthe crank to cam then the gear to the mag drive that cause all the floating around exactly as Mike says
     
    #9
    badbird, Mar 7, 2011

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