Originally Posted by
MNR-0
Yes, you are correct
High impedence injectors usually go down to 1.6ms. Low impedence around 0.9-1ms. Again, it depends on the quality of injector, but that is a rule of thumb I have observed over the many years
If you do not have any injector calibration data then you *always* start with your stock calibration (adjusted for flow rate of course) and tune from there to reach your desired results
For example,
I recently fitted 60lbs injectors to a factory stock car (exhaust and intake only) with an outcome of reducing the idle pulsewidth from 2.8ms (factory) to 1.6ms (60lbs). I would not think a factory car could handle anything bigger
I had no injector data short of the flow rate
With factory calibration, it would flatline at 1.8ms. Idle AFR was 11:1 and if left alone would foul the plugs and wash bores
I reduced the minimum IPW to 1, zeroed out the short pulse adder. That got me to 1.7ms - still too rich. I then re-scaled the offset table 20% lower at a time until I reached 1.6ms. At this AFR I now had bi-directional control around the stoich point (richen it up it would go richer and lean it off it would go leaner) and that was my goal. Now I had fuel control back, I tuned the VE map from there
The car now idles at 14.5AFR when warm and does everything it is supposed to when cold (starts nice) with a startup AFR of 11:1 (what I want) and leaning off from there
This was done with a wideband before the CAT
You can tune any injector (within reason) on an LSx without injector data