jonbill wrote: ↑
Sat Aug 13, 2022 8:57 am
for a single cylinder engine, channel 1 is the primary injector and channel 3 is the secondary.
This. Some background on your project requirements would help with better replies. IIRC staged secondary is simultaneous with the primary, so no issues there, though by the time you're into the secondaries sequential is effectively irrelevant, and the primary purpose of sequential (cylinder trims) is also irrelevant. For a 1-cylinder, the only addition is the cycle sensor signal to set "sequential", which is only the cycle ID for a 1-banger. Depending on your project requirements, an alternative is quasi-sequential, injecting every 360°, and used by several car makers today for economy and performance as it dwells more of the fuel for increased vaporization over standard sequential. No cycle signal required.
For the staged part, any ECM version of 2-ch or more should be fine for a single-cylinder. 4-ch will work out-of-the-box. If I have this right in my head (it's been a couple years since I've done staged), a 2-ch will need to have the second INJ channel reassigned output as INJ3 to function with standard code for staged. That's easy, though any code updates will require re-configuring the channel again. I would bench-test it to verify everything is working as-expected, then run it.