[Diy_efi] More GM MPFI V-6 questions.

[Tomas J. Sokorai Sch.]

On Saturday 26 August 2006 22:49, Joe Boucher wrote:
> I'm still unclear about a couple of things.  In a previous question,
> Brendan sent this link http://www.megamanual.com/ms2/GM_DIS.htm showing 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.

Go to the website http://www.smpcorp.com
then Catalog Look-Up  -> Part Number Look-up , then enter the part number 
LX-346 (that's the DIS module I used, with the apps listed and photos)
The crank sensor is PC7, look it up the same way to see what are the apps for 
it.

>
> 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? 

Yes, as there was already one hole for the diagnostic TDC sensor, I based the 
other six holes from that one. So I got the 6+-1 pattern for this ignition.

> But you will need to move the sensor 10 degrees advanced to assist in
> starting.

Yes, It starts semi-OK now, but with some seconds of cranking. I still have 
that on my "to-do" list, to have perfect starts ;)

>
> 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?

The 727 & 730 family are just like the 749, but with only one injector driver, 
so as far as I know, some guys run 749 codes on the 730 & 727.

>
> And last but not least, can any 7727 be converted to a turbo convig with
> the switch of a prom?

No need to convert. The 727 came in a stock turbo app. : The 3.1L V6 Turbo 
Grand Prix. Code mask $8F

-- 
Tomas J. Sokorai Sch.