I was looking thru the PocketLogger Instruction Guide and noticed the S5 has a display for Primary duty cycle and also Secondary duty cycle.

So I figure there's something here I don't understand concerning duty cycle. My understanding was that once you had the right figure for Load, and were over 3800 rpms, the secondarys come online and the primary duty cycle gets chopped in half and now both primary and secondary are at the same duty cycle.

So if that was true, why would I be interested in being able to see both?

Another thing I don't know. Are there actually four injector *drivers* in the ECU? Or is it configured in another way?

 

Yes, the S5 is a "better" ECU in that it can blend the secondary transition.

The way the ECU was designed was with two PWM outputs in the processor. Instead of doing a sudden cutover to using both pri/sec (and halving the DC at that point) it will ramp up the pulsewidth of the secondaries as it decreases the pulsewidth of the primaries until each one is running half the PW.

I think there are the same number of drivers, it's the processor that is different giving it the ability to control two sets of pulsed outputs at different DC.

 

Ok. I might see why you'd want to look at Primary and secondary, in that case.

Ramp up the secondary and decrease the primary. I think that's what you meant to write above.

 

Good catch, fixed.