[Diy_efi] LS1 coils, smart or dumb?

[r71chevy at earthlink.net]

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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