TBI with TPI ecm???

[Kevin R]

Actually what I was wondering is how much is involved in using one of these
ECMs to control a TBI system, in particular a crossfire. Just seems that
both the speed and number of parameters output to scanning software is much
better on later SD TPIs than the TBI (currently 747) ones, which could be
helpful.
Since they basically fire two banks of injectors I was wondering if using
one to fire two TBI injectors is just a matter of tuning the prom tables or
if there's more to it.

Kevin R

> Are you asking if you can obtain a TPI ECM and configure the hardware
> and software for a TBI?  If so, there are many ECMs that can support
> both modes.  For example, the '7730 has been used for both TPI and TBI
> applications (with different software though).
>
> Or, are you asking if you can use a TPI ECM configured for TPI but
> driving a TBI?  If so, then the answer is almost always no.  With a TBI,
> you have to fire the injector(s) once per induction event.  The TBI uses
> the airflow through the wet manifold to route the fuel to the correct
> cylinder.  If you fire the injector(s) at the TPI rate, some cylinder(s)
> won't get any fuel.
>
> --
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/


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