ECM Tolerances? EEPROM PCM in LT1

[Roger Heflin]

On Thu, 20 Aug 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: Thursday, August 20, 1998 3:45 PM
> Subject: Re: ECM Tolerances? EEPROM PCM in LT1
> 
> 
> >Bruce,
> >I  am going to post to this list what I posted to the fourth-gen list for
> >larrys article.
> >The knock sensor filter is in the computer. (I think).
> >So both filters might be mostly working just working differently, and one
> is filtering more of the "junk" (false knock) out.
> 
> OK yes that makes sense, but how does it relate to the several
> .1 ms injector pulse difference?.

I guesss I don't know what would do this.  I would think the injector
drivers would be pretty consistant from ecm to ecm at least timing wise,
since transistors generally have little difficulty working at those low of
speeds.   

If they A/d convertors where different that would seem to make the O2
values at WOT read diffferent, and he said those read very close to each
other.

Do we know if all of the computers try to target the same operating
parameters?

I really cannot think of anything that would explain less injector on time
given what we have.

Though given slightly different conditions (environmental) I have seen my
vary by .3 or so on plusewidth with everything else the same.

				Roger