DIY_EFI Digest V4 #162

[Bruce Plecan]

-----Original Message-----
From: Glen Beard <gbeard1 at nycap.rr.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Thursday, March 18, 1999 6:36 AM
Subject: Re: DIY_EFI Digest V4 #162


>Bruce Plecan wrote:
>
>> I got an idea,  this will sound easy but will take some work to dial in.
>> Take the Distributor apart and get a second shutter disc.  Notice how
they
>> have a set of
>> 4 matching slots, and 4 oblong holes at one radius from the center.  Take
>> the second disc,
>> and redrill it so that when you hold it up to the light you have 8 small
>> holes on the one pattern.
>> Then use a regular 7 pin ecm module. Fab a little kludge to read the 8
holes
>> as the normal reluctor/pickup would and then feed that to the module,
then
>> wire the module as you would normally to a say 1227730.  Then the rest is
a
>> plug and play for the harness/sensors.
>>   One LT1 driven by a 730 thank you
>
>The LT1 Optispark(distributor) already has a slotted disc in it.  There are
high
>and low resolution slots.  The high res has 360 slots and the low res has 4
long
>and 4 short slots.  If you are going to 'fabricate a little kludge',
wouldn't it
>be easier to just use the existing hardware?

Reread what I said...   I am.

  An led/light sensor pick up the
>slots.  Then you could take the output (which would already be digital) and
>convert it from 360 to 8 pulses for the input into the older computer.

If you start with the high resolution 360 then you have to develope a start
point..
All the electonics for reading the hi+low are in the ecm.
>
>There is a pic of the disc in the optispark here.
> http://www.charm.net/~mchaney/optisprk/optisprk.htm
>
>--
>Glen Beard
>95 T/A conv M6 Vortech  !heads, !cam
>http://home.nycap.rr.com/gbeard1/TransAm.html
>
>