[Diy_efi] 2.0 diss module with the 1227749

[Shannen Durphey]

I'm using spark timing to determine reference angle.  When the dis module
is in bypass mode, it sparks when a notch (forget the #, that's what the
chart on the ftp site is for) is directly underneath the sensor.  Call this
0 degrees. ; )

When the module is in est mode, the spark is advanced by 60 degrees.  I
have a good light that allows the timing advance to be dialed in to view
this.
I have also confirmed that the notch that fires the module in bypass mode
is the same notch that is below the sensor when the crank is at TDC #1.

So it would appear that the reference angle is 60 degrees.

The module does not seem to have a problem with cps pulse timing being less
than oem.  A perfect wheel would match the crank wheel dia, mebbe 5" or
so?  The one I'm using is about 3" dia.  But the ecm doesn't care, since it
measures the time between reference pulses to determine the rpm.  I've seen
nothing on the scope that leads me to believe the setup I'm using is not
generating proper reference pulses. 

Your second question is what the whole issue is about.
Shannen

Djfreggens at aol.com wrote:
> 
> shannen im gonna due some things.first im gonna get the exact ref angle. im
> gonna use a degree whel with the head off. this will sovle the first issue.
> second whats different about the code ?? i know there is a small one form
> what yr saying. maybe importing the code form a p4 ecm with dis might help.
> im gonna ask around some more and see if anybody knows anything else. as for
> the oscilliscope data. as for using it to determine the ref angle no. as for
> using it to understand the control of the module yes. understanding the wave
> form and output might help. so when i get the reults i will pass it on to
> you. i kow youve said its 60 but i wonder if it really truley is. also what
> type of wheel are you using the factory wheel or not ?? this could be the
> issue it might be diameter sensitive. as the velocity of the outer edge of
> the wheel night change.
> 
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