ThomasColtart wrote: ↑Fri Sep 24, 2021 5:16 pm
Hmm, i was thinking about this more. I actually don't think it matters "batch" or "paired".
It doesn't for fuel calculations, and you are correct that it is simply fired by the "wrong" channel. However, the fewer channels you use, the more cylinders will be different in fueling characteristics and some resulting performance.
On one channel (6inj x 1ch) with simultaneous and 2-squirts, there are 4 cylinders off-time. On two channels (3inj x 2ch) you have 2 cylinders off-time (120 & 240), with any timing or squirts combination. But, with 2inj x 3ch (paired) and 2-squirts/cyl, you have zero cylinders off-time and both quasi-sequential (double-shot sequential) and equally-timed fuel dwell for every cylinder. This carries the same cylinder pairing as wasted-spark ignition, which obviously must be correctly timed. These reasons are why the last option is preferred.
That said, yes it's better, but as shown by millions of 3x2 engines out there - yes you'll likely not know it unless tuned quite well. However, if you want to start at best advantage (or move to it later), paired is the easy option to get there with little effort and two wires. Your project, your decision.
TL;DR - when reasonably possible, wire injectors in paired "wasted-spark" configuration, or add a second sensor for full-sequential options.