DFI, Batch Fire, and other myths

[Ken Kelly]

My comment was in reference to the idea that using two O2
sensors implied you could have two independent fuel controls
for the two injector drivers. The early ECM's & O2 sensors
were too slow to be able to react to individual cylinder
firings. There was an implication that the two O2 sensors
would allow independent fuel controls for the two injector
drivers. Since each O2 sensor is on a different bank, the
injectors would have to be grouped by bank to get this
independence. That would require some injectors to have
their whole injection cycle completed while the intake valve
is closed. I can't see how that would cause good fuel
mixture. I would think there would be a lot of fuel
seperation and pooling in the inlets that always fired while
the valve was closed. I would think at least from an
emmisions point that GM would gain more by having the
injectors ganged so that they fire closer too the intake
valve opening, than having them ganged by cylinder bank..
		Ken

Tom Sharpe wrote:
> 
> Ken Kelly wrote:
> 
> > This only makes sense if the injectors are fired as left
> > bank and right bank. I would think you would gain more
> > benefit by grouping them in firing order rather than by
> > bank.
> 
> My ProFlow fires 4 sets of 2 injectors 1-8, 4-3, 6-5, 7-2. foue
> circuits/timers/drivers, one O2 sensor.   Tom