Injector Firing

[bruce plecan]

On a GM ECM, like what is used on the 87-89 camaros (TPI) they have the
injectors wired into two groups of four.  Would that mean they alternate
firing each group every 90 degrees?,  180 degrees?  360?.

On the TBI's they fire in synch with the cylinders only at low fuel demand
periods, right?.

Do they do the same thing with the batch fired TPI's?.

Thanks in advance
  Bruce     nacelp at bright.net                    Cone shaped hat is really
gettin
                                                                
comfortable, and the locals aren't
                                                                 starring
as much