Running 8 low impedence injectors on GM ECM using an auxilliary injector driver?

[Walter Sherwin]

> Doesn't the Accel VIC trigger all 8 injectors at once based on a single
> input trigger? Could this cause any driveability problems on the 1990
> Camaro/Firebird V8 and other similar GM ECM's? What about bank fire
systems?
>
> Jason


You are right Jason.  I just rechecked, and it looks like one input trigger
for all 8 injector channels in the case of the VIC.  However, this is no
biggie for a batch fire engine as you have described above.  The 90 L98 for
instance, in OE form, fires all of the injectors simultaneously according to
SSDF or SSSF or ASYNCH mode.  So, no matter whether you tap into the INJA
trigger or the INJB trigger of the ECM, things should be fine.  One box
would then control all injectors, up to a max count of 8.

You would only really need independant bank control in instances such as
dual alternating channel TBI setups, or hybrids thereof (Holley 4bbl TBI,
Dual Rochester TBI's, custom MPI controlled by dual channel TBI ECM's,
etc.....).  Even then, you could also run some of these simultaneously and
asynchronously, in a pinch, using a VIC.  To retain independant bank
control, will require a custom external box.  An example JPEG schematic of
such an external custom box can be found at the incoming directory, under
the name "External TBI P&H".


Walt.


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