[Gmecm] re dual4cyldis modulefor v8 use

[William Lucke]

WAY WAY WAY too complicated, IMO.

I think the most ellegant way to do it would be with two sensors and two 
modules. BOTH reference lines go to the reference input on the ECM via 
diodes. The ECM gets reference signals from both modules, but the 
modules don't see each other.

The ECM's EST output goes to both modules through a simple gizmo that 
would just route the current EST pulse to the module that delivered the 
previous reference pulse. It would obviously have to "see" the reference 
pulses from both modules, but wouldn't have to modify them in any way.



Will



> From: DV Fagan <dvfagan at yahoo.com>
> Subject: RE: [Gmecm] re dual4cyldis modulefor v8 use
> 
> Brendan and Peter,
> Short of adding a sensor which would electrically
> select the coil pack to trigger, the flip-flop needs
> to be a tiny microprocessor which takes trigger input
> from the ecm and outputs triggers to the coil packs. 
> It watches for cranking as indicated by the low input
> trigger rate and then tries syncing pack A with the
> next trigger and pack B with the following trigger. 
> If after two seconds of cranking the engine doesn't
> fire as indicated by an increased trigger rate, the
> micro changes the pack A and pack B pairing with the
> triggers and continues the cycle until the engine
> fires.  It then retains the pairing until cranking is
> detected again.  This can be built for under $10.
> Dennis
> 
> --- Brendan Patten <bpatten at centurytel.net> wrote:
> 
>> I'm looking into the flip-flop idea.  This could
>> work.  I too am not too
>> familiar with this area of electronics, however I am
>> doing some reading
>> to try and figure this out.
>>
>> Each module will send a ref pulse to the ecm 60
>> degree before each TDC
>> event.  The ECM then can send a signal pulse back to
>> the module anytime
>> in the next say 60 degrees to fire the coil (saying
>> max retard of 0 deg)
>> That leaves 30 degrees at a minimum to flip over to
>> route the ecm's
>> signal to the other module. And so forth.
>>
>> The thing I want to figure out, is how to
>> synchronize module 1 ref,
>> output to module 1, module 2 ref, output to module
>> 2, and so forth.
>>
>> http://www.play-hookey.com/digital/
>>
>> site I found so far, good intro to logic.
>>
>> This making any sense to anyone?
>>
>> -----Original Message-----
>> From: gmecm-bounces at diy-efi.org
>> [mailto:gmecm-bounces at diy-efi.org] On
>> Behalf Of Peter Jenkins
>> Sent: Monday, October 02, 2006 6:03 PM
>> To: gmecm at diy-efi.org
>> Subject: [Gmecm] re dual4cyldis modulefor v8 use
>>
>> have been trying with 1227808 using 2 6cyl dis coils
>> for v12 
>> the only option was as previously mentioned ,run two
>> ecu's
>> reason is  you double the rpm which you can work
>> around but limits max
>> rpm to half previous ie 3000rpm 
>> what I had in mind is a type of  x2 flip flop
>> circuit on the est output
>> double out put pulses and send them along
>> alternating outputs but still
>> run the second sensor to time the second dis pack in
>> start up/limp mode
>> Have got a set up on a test bench that works in limp
>> mode fine but can't
>> get the x2 flip flop circuit to work as that is not
>> my line of expertise
>>
>>> Peter Jenkins
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>> Pine Mountain Vic. 3709
>>> Australia.
>>> PH 0425 705764
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