GM optispark

[Roger Heflin]

I am not sure if it is just taking 1-1.5 turns to sync things, or if
it is taking more, Sometimes it starts immediately, and sometimes it
takes maybe a second or so.  How fast does the starter spin the
emgine? that would give me a pretty good idea of how many spins we
were talking about.

I added my electromotive install notes (additional things to note if
you are installing it), and comments link to my web page. 

My home page is at: http://www.hit.net/~rah

It is at http://www.hit.net/~rah/noopti.html

				Roger

On Mon, 7 Dec 1998, Bruce Plecan wrote:

> 
> -----Original Message-----
> From: Roger Heflin <rah at horizon.hit.net>
> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Date: Sunday, December 06, 1998 11:41 PM
> Subject: Re: GM optispark
> 
> In you mention of slower to start is this most likely due to having to spin
> over a full turn at times to synch things?.  Or does it take several full
> crank revolutions to get things organized?.  Quesses here are fine by me.
> Bruce
> 
> 
> >
> >I have the electromotive unit.
> >
> >It has a crank trigger with quite a few teeth (each 6 degrees I
> >think), and generates the needed signals for the computer to be happy.
> >It runs really good once it starts.  The starting is not quite as
> >quick as with the stock opti, but I really improved and changed the
> >readings at idle (better igntion/burning).  I probably should put
> >something on my web page.  I have got a request from the fourth-gen
> >f-body list to write up my experience.
> >
> >
> > Roger
> > 93 Z28, !opti, 115k original waterpump.
> >
> >On Sun, 6 Dec 1998, Bruce Plecan wrote:
> >
> >>
> >>     -----Original Message-----
> >>     From: Curtis Mittong <poohbear at twd.net>
> >>     To: diy_EFI at efi332.eng.ohio-state.edu
> <diy_EFI at efi332.eng.ohio-state.edu>
> >>     Date: Sunday, December 06, 1998 12:35 PM
> >>     Subject: GM optispark
> >>
> >>     Electromotive sells a DIS (4 coils, not 8).  Some one on the list did
> that some time ago, you'd have to hunt the archives, unless he's still
> active.
> >>     Cheers
> >>     Bruce
> >>
> >>
> >>
> >>     Here's a mental project for anyone with extra time.  To: anyone
> familiar with GM optispark units.  As you know the whole thing is a pretty
> self-contained unit with a cap and rotor in a small, cam-driven unit and a
> nearby coil pack.  The problem is LT1 water pumps die pretty regularly at
> 25-35k miles spewing dexcool all over the thing ruining it.  They are not
> rebuildable, they have to be replaced in one extremely expensive unit.  What
> about avoiding the time bomb altogether?  I was thinking a crank positioning
> sensor and one coil for each cylinder a la Northstar or LS1.  Will the
> computer signals be compatible with my stuff?  I want to keep the stock
> computer setup, just plug and go.
> >>
> >>     Thanks,
> >>     Curtis
> >>
> >
> 
>