[Diy_efi] LS1 coils, smart or dumb?

[arnie]

GM uses same part # for vette and Camaro...12558948

GAS


r71chevy at earthlink.net wrote:
> 
> I seem to recall that the Vette ones were smart & the Camaro/Truck 
> ones were not.  the question that I had though was, why did GM make 
> them different from vette to Camaro.  I would think that that they 
> would want to keep them as similar as they could.  But then again, 
> I would imagine that they have different ECM's like the earlier Gens, > so why not.
> 
> BW
> 
> On Thu, 22 Aug 2002 21:46:30 -0700 Derek <derek_obanion at yahoo.com
> wrote:
> 
> > I checked the achieves, and got lots of posts related to this 
> > question, but it never seemed to get settled.
> >
> > I know the LS1 coils have the ignitor/module/driver built in. 
> > I know they are activated by a 5V signal from the ECU. But what
> > I don't know for sure is if the coils are "smart" (adjusting the 
> > dwell) or "dumb" (dwell set by signal from ECU).
> >
> > The statement I saw most was that they were in fact dumb, starting 
> > the coil charge when a 2.7V+ signal was sent to the IGN input, and 
> > discharging when the signal dropped to 0V. In this way the dwell 
> > is controlled by the ECU or whatever you are using as a signal 
> > generator. Is this correct?
> >
> > Also, is the 4-pin plug for each coil a standard 4-pin 
> > weatherpack? Looks like it.

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