Igniters => DIS

[James Ballenger]

They are already going on 2001 trucks too.  I found them on a 00' suburban
5.3L engine.  GM part # 10457730.  I still wonder if these have dwell
control however, because this could still be controlled at the PCM.  How
were you able to verify that they do have dwell control?

Thanks,
James Ballenger

>-----Original Message-----
>From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
>Behalf Of Jurgen Hartwig
>Sent: Wednesday, February 28, 2001 11:15 PM
>To: diy_efi at diy-efi.org
>Subject: Re: Igniters => DIS
>
>
>> thanks, if you run across the info on the Motorola chip I would be
>grateful.
>> I would go search their site but what site do I search
>(Motorola, Cheri
>or
>> ON semi)?  if you cant come up with it, I'll get over it.
>maybe first I
>> will check the archives for the CNP or was the reference to
>DIS & Waste
>> spark?
>>
>
>Hello Bob, I brainstormed and remembered where I saw the
>Motorola chip.  A
>fellow from my alma mater, Georgia Tech, designed a DIS system
>for one of
>the school's Formula cars.  The write-up is on the DIY-EFI
>webpage.  The
>portion of the article you need to view is in Portion 2, labeled
>"Ignitor." Duh!!! :)  Here is the weblink,
>http://www.diy-efi.org/diy_efi/projects/ddis/ddis2.htm
>
>I am no electronics expert by any means, but this looks to be
>what you are
>looking for.  It has TTL input & dwell control, so it appears
>to fit your
>needs.  Please excuse me if I am wrong.
>
>Regarding the CNP, or rather Smartcoil, as it was called in
>1998 archives,
>here are two pieces you and others might find interesting.  Both below
>quotes were written by Gar, I believe of EGOR fame.
>
>"A guy in our Aviation group that
>works in a GM lab sent me one of these off a decommissioned test
>vehicle, and they are NOT mere IGN coils, they're complete single-coil
>IGN "systems". They contain ALL the electronics for dwell control,
>current limiting, etc etc. These coils are DIRECTLY run from the
>ECM/PCM. There is NO module. They have 4 terminals (plus the HV
>terminal, that uses these ratchet style terminals I was tellin bout
>yesterday), two for Bat Gnd, and Bat +12V, and the other two are the
>digital EST signal and it's low-noise gnd return. Not usable for ION as
>a transformer-type coil, cuz you cain't get to either the primary or
>secondary on these puppies, but still a VERY elegant setup, indeed.
>That ain't all. The biggest shock is yet to come. Brace
>yerself. They're
>actually CHEAP (and nice and light, too). I couldn't believe it when I
>went to check them out further. The GM parts counter LIST price is $41
>for each "smart coil", and EVEN the harness for tying four of them
>together is reasonable, list price of $62. You get 4 connectors for the
>4 coils, and another larger connector. Not a bad price for 4 GM
>connectors and pigtails (if you decided you couldn't use the harness as
>is), at the very least, and you might even be able to get the bigger
>connector from Packard! The shorty coil wires (yes, these DON'T squat
>ontop the coils) have them real nice connectors I mentioned,
>and they as
>well are pretty reasonable, at $11 ea list."
>
>And
>
>"I have nary a clue as to what an ICM is; never heard that
>before, unless
>you mean just a "module". But these coils have all the electronics in
>them to do the dwell compensation, etc., so they have NO
>module, but are
>fired directly by a 5V logic level signal coming from the PCM. There is
>NO separate system for just the IGN, the PCM controls all the
>IGN & EFI.
>As far as a retrofit, not without some additional electronics. You need
>at LEAST a crank wheel to fire these per-plug coils in pairs,
>and if you
>really wanna fire only one plug at a time, then you HAVE to have a cam
>reference as well. In addition to mere triggering, you'd need something
>to model an advance curve, both the certifugal part that's rpm
>dependent, and the vacuum part that's MAP dependent.
>Rather than an older style dizzy based retrofit, I'd say these new GM
>SmartCoils are more appropriate for someone who's gonna buy an
>aftermarket ECU that's cabable of outputing spark trigger signals
>directly, on a per-cyl basis. Then they'd be ideal, just one wire pair
>from ECU to coil per cylinder, and poof coil/module DI system a done
>deal."
>
>Bob, I know these "Smartcoils" are available on the V8
>Camaros.  You might
>be able to find these in a wrecking yard.  You can also wire the two
>triggers together, ala DIS.
>
>
>
>
>
>> I know it is a bunch of work, but it keeps me out of the bars &
>stimulates
>> the mind.  I am running a 383, super ram, 700r4 & a 7730/8D.
> check it
>our
>> if you'd like www.r71camaro.homestead.com
>>
>
>Surfed over to your webpage.  We are at opposite ends of the spectrum.
>The engine in your camaro weighs as much as my '76 Porsche.  I couldn't
>stop laughing at your puny rear brakes. :)  Me, I can stop on
>a dime, but
>not much go juice.  That's one nice engine, though.  I also
>saw your old
>VW toys.  That is my fun now.  Aircooled VWs and Porsches.
>
>
>Good luck.  Let me know if you do the Smartcoil thing.  I am
>almost half
>tempted to sell my RX-7 waste spark coils and just go with the
>Smartcoils.
>They would be excellent for my small engine compartment, and since I'm
>going to be running aftermarket engine management... ;)
>
>Jay
>
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