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DIS 2.8 Camaro? WTF?

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  • DIS 2.8 Camaro? WTF?

    I've already posted this on another site and thought I'd add it here for anyone interested.

    I've recieved a few questions recently about how to set up a DIS ignition system. So I figured I might as well be the guinea pig. You'll need a coil pack & oil pump drive from a 3x00 and either the 7x sensor from the 3x00 or an abs sensor from just about anything (mine's from a '99 durango). I preffer the abs sensor because it has a nice strong neodymium magnet that gives a clear strong signal.

    Here's a pic of the 'bracket'. It's a washer welded to the side of the timing tab with a flat ground on one side to keep the sensor from rotating. Placement on the tab isn't critical since you're going to adjust it later, just needs to line up with the reluctor. Adjust the air gap to .04"



    You can either cut notches in the pulley using this diagram as a template or transfer it to a 1/4" steel plate to make a reluctor.



    When you swap connector ends on the abs sensor make sure you have the polarity correct. Check the sensor with a multimeter by probing the connector and placing the sensor on a piece of steel, then removing it. Should read positive voltage first then negative as you remove it. Voltage is in millivolts.

    Rewiring should work as follows.

    DIS pin -----> Connection
    A ----------> Ground to block
    B ----------> Ign pwr (coil orange or pink wire)

    A ----------> Crank sens. high
    B ----------> N/A
    C ----------> Crank sens. low

    A ----------> Bypass (dist. pin B)
    B ----------> EST (dist. pin D)
    C ----------> Tach Lead (coil black w/ white stripe wire)
    D ----------> N/A
    E ----------> Refrence (dist. pin C)
    F ----------> Ground (dist. pin A)

    You don't neccecarily have to replace the distributor with an oil pump drive, but replacement's simple. Just 1 bolt. You won't need new plug wires either, just move the longest to the far side and route behind the plenum, then trim the rest to fit. The coil pack almoast bolts in place, all you need to do is cut off one side of the coil bracket and enlarge the bolt holes a bit.

    And finally here's a bin to get you started, post #158. When using a $6E bin the max spark is set to 90* (the max possible), base timing to 0* and 50* is added to the whole cool spark compensation table. This will limit you to 40* max, but you won't need as much spark with 3x00 heads.

    After everything's assembled start it up and verify your timing with a timing light against what's in the table. You can program another chip with the main table set to 10* to make things a little easier. You will need to make your own timing marks somewhere if you weld a washer to the timing tab since the sensor moves with it. And please, don't try adjusting the sensor with the motor running . Here's a pic of it assembled. Looks right at home, doesn't it?



    And a close up.

    Last edited by 85maro; 02-14-2010, 04:59 PM.
    Increasingly I find the difference between a "fact" and an opinion is the number of people who believe it.

    3.4 block converted to roller valvetrain with 220/225 cam on 115 lsa, '769' heads with 3500 valves, LS6 springs & porting, twin T04E turbos, 3500 plenum with ported 3400 lower & 'short star' 65mm throttle.

  • #2
    Very nice. I will probably make this an article, as the way to created the post is just perfect for an article. Thanks!
    -Brad-
    89 Mustang : Future 60V6 Power
    sigpic
    Follow the build -> http://www.3x00swap.com/index.php?page=mustang-blog

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    • #3
      thats pretty smart.

      Its runs!!!>>>Aint No 60* Sound Like Mehttp://youtu.be/YKEmNwa141U

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      • #4
        Here is a link to a write up on how I did this on a 2.8 Fiero. Works like a charm.

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        • #5
          Nice job!

          Sure beats your other idea of using the 24x and welding all the holes shut haha.

          anyone fabricating one on their own should keep in mind, that you don't have to use the offset in the .bin like that. If you just are transferring the reluctor from the inside of the distributor and mounting it on the crank, you can adjust the location to match the stock iron head timing setup.
          Links:
          WOT-Tech.com
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          • #6
            Yea, that never really had a chance. I'd have to build a small computer to get the 24x sensor's signal resembling something useable to the icm, which I don't think anyone would be interested in making LOL.

            Changing the reluctor position will work against you at startup since it would be firing at some crazy angle like 60*. I'm still trying to figure out why GM programmed the icm the way they did. Fires just like it should when cranking then retards it 60* after it starts? WTF?
            Increasingly I find the difference between a "fact" and an opinion is the number of people who believe it.

            3.4 block converted to roller valvetrain with 220/225 cam on 115 lsa, '769' heads with 3500 valves, LS6 springs & porting, twin T04E turbos, 3500 plenum with ported 3400 lower & 'short star' 65mm throttle.

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            • #7
              It does not matter where you mount the pickup sensor. It matters where you put the notches.
              Mount the sensor, then turn the engine to TDC of cyl.#1. Mark where the center of the sensor lines up with the damper. Now place a mark X degrees ATC where X = the BASE timing of the engine. Put the first notch centered on this mark. Put the second notch 10 degrees after the first notch. The next five notches are spaced 60 degrees apart from the FIRST notch.
              When the engine starts the Bypass signal locks the ECM out and the DIS module runs on the base timing. After is starts the Bypass signal goes away and the ECM can advance the timing to whatever it wants.
              Contrary to some of the myths out there the ECM does not fire the plugs. You can run a DIS ignition without a ECM and advance the timing with a Potentiometer. I have put a 4 cyl DIS system on a carburated skid loader.
              The DIS system is a "Next to fire" system. It can't advance a plug firing to a signal that has not happened yet. So it applies the advance to the next plug to fire. That is the 60 degree change you refer to when the engine starts.

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