DIY_EFI Digest V4 #162

[Glen Beard]

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?  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.

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