Re: TBI to TPI Conversion

["nacelp" <nacelp@bright.net>]

having ecms, tcms, pcms, can generate problems.  Some us different pull up
resistors so the different controllers would be thinking different values.
I had tried with approach with the ecm, and things got confusing.  Figure
out what Items need controlled, and how but to do that, one controller is
better then 2 in my book.  Some of the pcms can run either strategy..
Grumpy


> >Problem with the '94 Camaro is the optispark ('93 was non-electronic
> >4L60). Now, you could just drop an LT1 in there and call it good, but it
> >would be tough (not impossible, just tough) to use an LT1 harness / PCM
> >with a TPI motor (TPI still has the Dizzy).
> >You could possibly "piggy back" your PCM with a second ECM and have your
> >PCM drive the tranny, and the ECM drive the TPI... Feed your PCM the
> >right inputs (VSS, etc) and it should control the tranny correctly. Rats
> >nest of wires, though. Why don't ya just stick an LT1 in there (or even
> >higher on the coolness factor, an LS1). ;^)
> >I think you can purchase dedicated electronic tranny controllers,
> >though. Do that, get a TPI setup off of a 90-92 Camaro, and you're set.
> >Anything's doable, though, for enough money. ;)
> >-Andrew
> >Todd Burkard wrote:
> > > I just want to get an idea what I am in for Along with the other Prom
> > projects I am working on I am pondering the Idea of converting my 94 GMC
> > 4x4 to a TPI or SFI setup. Has anyone done this type of conversion on a
> > pickup that has the Electronicaly controled tranny? I was thinking maybe
> > a harness and computer out of a 93 or a 94 Camaro.
> > > Thanks,
> > > Todd
>  I am not that familiar with the 94 setup but if it is similar to
> some of the older ones with 2 injectors and (supposedly ) 2 drivers  all
> that is required is to change the drivers to handle 4 TPI injectors and
> radically decrease the injector on time and i think more injection events
> per rev.  The tranny code can be left as is.
>          This approach will allow the use of the stock wiring harness with
> a few splices but may be too much of a difficult software change .  you
> will have to determine which rout you can do the easiest
>                  Todd Israels


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