Bug using Pocketlogger to monitor Pri & Sec Injector ratios
 

Not sure if this is old news or if I found a bug... Yesterday I was playing with the Pocketlogger software, and had it set up to monitor/log the following parameters:

RPM, Airflow, MAP, L & T Timing, Intake Air Temp, Coolant Temp and "Pri. Inj. Ratio" & "Sec. Inj. Ratio". Everything but the last two seemed normal. At idle, I was reading 100% on the Primary Inj. Ratio, and the Secondary Inj. ratio was reading 0 %

This is with an '89T2 which runs perfectly normal, N370 ECU, and 720cc injectors in both Pri & Sec. The 0% is a normal reading for the secondaries at idle, but the 100% reading for the primaries could not be possible - if that were the case the car would be pig rich and would probably stall/not idle at all.

So I took it for a drive, logging data to see how things would read. Result was the primaries always read 100%, and the secondaries abruptly went from 0% to 100% when they staged in at the stock staging RPM around 3800RPM. Obviously this isn't possible with the car running right - one would expect to see the primaries vary from some low % at idle, increasing towards 100% near the staging point, and at the staging point the secondaries should start going above zero, while the primaries cut back some as the secondaries begin to open up.

Thoughts?

You are confusing Injector ratio with injector duty cycle. The behavior you see is normal. Ratio is the ratio between the primary and secondary, not the duty cycle of the injectory. You need to log injector DC.

That makes sense, I did think I was logging injector duty cycle with the "pri/sec injector ratio" parameters. I don't see much use for monitoring "injector ratio" as described above, can pocketlogger monitor pri/sec injector duty cycles? If so, how?

Don't see an injector duty cycle parameter anywhere in the parameter list when hooked up to my ECU and with the car running. I have logged pri/sec injector PW (pulsewidths) before, and those figures seem to respond as I would expect. Would be nice to do the same for duty cycle, as it would be a good measure of how much "headroom" my current injectors has for future tuning/mods.

Go into preferences and check the "log D/C instead of PW". D/C will be calculated in realtime as long as RPM is also logged at the same time.

^That did the trick, thanks! :icon_tup: