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Originally Posted by Aurora40
I'm not sure the LSx ECMs have individual cylinder monitoring? I imagine they still have one O2 per bank? And I think only the new ZR1 has the dynamic fuel pressure control?
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Bob, I wuz speaking in more general terms with regard to the exponential increase in tuning variables for today's "ECMs" and those that dabble in tuning them, compared to the OBD-I and the LT5s.
A tuner would know, but I seem to recall reading that the exhaust pulses from the individual cylinders across the respective bank O2 can be (and are in some cases) monitored with respect to the exhaust valve timing. Thus, the mix and even the timing can be or is tweaked on individual cylinders - one of the advances allowed by the faster computers and OBD-II - one of the big advantages of the LSx over previous (OBD-I) ECM limitations. This could make position of the O2 on aftermarket exhausts a bit critical, if correct indexing of the cylinder is to be maintained. (I don't recall the source - been a while back.)
As for variable fuel pressure, I was referring more to the variety of variables facing the tuners of the latest engines (LS9 to be specific - also an "LS" motor). Point being, with the monitoring and sensing capabilities available to today's tuners - to the point of individual cylinders, if needed, certainly raises the bar when it come to tuning (not that every tuner would need or even want to delve to that level).
P.