[Diy_efi] More GM MPFI V-6 questions.

[Lee M. Lemoine]

I can vouch for a '7730 running the turbo code on a GM 3.1 V6 -- as far as
i'm aware if your going to use a DIS system (and use the distributor shaft
only for a crank / sync pulse) the DIS module would handle the spark
advance.  I'm not sure how it works on non-dIS GM vehicles as i've never
tweaked one with a distributor, at least not yet...

As far as i can remember the '727 and '730 are revisions of one another.
The one i speak of (The 730) is non-weatherproof and was mounted inside the
car.  (93 chevy cavalier)

PS, on my engine, the Crank position sensor plugs into the DIS module, and
the DIS module will automatically handle 10 degrees of spark on its own from
what i remember, theres a pin that the ecm shorts to enable the ecm to
control timing, i believe thats above 400 rpms it gets enabled...

-- Lee



On 8/26/06, Joe Boucher <boucherj at prodigy.net> wrote:
>
> First, Bob and Tomas, thanks very much for the great answers.   A couple
> of the best answers I have ever received from one of these lists.  Very
> concise and to the point.  The wife asks why a tear was rolling down from my
> eye.  When I explained, when rolled her eyes and walked off.
>
> I'm still unclear about a couple of things.  In a previous question,
> Brendan sent this link http://www.megamanual.com/ms2/GM+AF8-DIS.htmshowing the ignition module needing a crank sensor as an input to the DIS
> module.  The model year application of this configuration isn't on the
> paper.
>
> Bob, you said the stock reluctor in the Porsche worked.  So, you used the
> distributor?
>
> And Tomas, you drilled six more holes in your harmonic balancer for a
> total of seven holes, including the offset hole to signal number one
> cylinder?  But you will need to move the sensor 10 degrees advanced to
> assist in starting.
>
> My understanding is there is another box besides the 749 which is similar
> to the 749 hardware and can use the 749 prom, but needs the wiring switched
> around a bit.  Is this true?
>
> And last but not least, can any 7727 be converted to a turbo convig with
> the switch of a prom?
>
> Thanks again for the excellent responses.
>
> Joe B.
>
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-- 
Sincerely,
Lee M. Lemoine
KB1NQI  - Amateur Radio
http://www.turbochargedsoul.com/
'06 Subaru Legacy GT Limited - 250/250 AWD 5EAT
'93 Chevy Cavalier Z24 Convertible - 300/330 FWD 5MT (Mclaren Turbo!)