I want to run a distributer, and i was wondering since the computer controls the timing if i was to get a crank trigger and wire that int othe opti spark pigg tail would that be good enough to let it know whe nt ofire the injectors. the timing parts should not matter since it would be over rode by the distrubuter?

 

Okay now tha ti read it, its sounds confusing. Basicly what i am asking is what do i need to do in order to run a distributer and still keep the stock ecm.
a list of parts and some good instructions would be nice.

 

You cant totally get rid of the opti if you want the stock ECM still since the opti is the fuelling refernece for the PCM too.

You can put a distributor in there and have it be in charge of spark distribution. A post under my name entitled "interesting lt1 distributor find" may be useful (posted in advance tech about a year ago.

 

thats why i was wondering can i use a crank trigger to fire the fuel injection. i did the search before i ever posted about this and i read the whole thread. and no where in there could i get the answer. I also read that the opti pulse and a crank triiger are no different(some guy from pcmforless posted about it). see what i was thinking is let the computer think that it is controlling the ignition even though it is not, and just use the crank trigger to tric kthe computer into firing the injectors. is it possible? im probabley wrong but i would like someone to explain it on how it could or could not be done.

 

The fuel injection 94-97 is full sequential. The PCM needs CAM position, not crank position. The Opti low res pulse is a series of variable length pulses, each of 4 unique pulse widths representing 4 cylinders, with 4 fixed pulse width slots alternating with the variable length slots for the other 4 cylinders. You need the distinct Opti pattern for the PCM to get the injector sequence correct.

Leave the Opti on the engine, but take the rotor out of it. In effect, you are using the optical sensor to feed the PCM the cam position. Without the high voltage in the Opti case, it seems to extend its life and reliability quite a bit. I've seen the Opti reliably support an 8,000+rpm blown 383 making over 1,100HP with this approach.

Check with Alvin at PCM for less. He posted on another forum of some testing he and Ion have beed doing to replicate the Otpi pulse pattern.