On a totally stock bike, all the IEDs do is "fool" the ECM into thinking the 02 sensors are detecting a leaner running condition than they actually are. Hence, the ECM tells the fuel injection to richen things up a bit. The end result is that in closed loop you wind up running an AFR of around 14.0:1 instead of the 14.6:1 to 14.7:1 that a stock bike runs at.

How the IEDs work with PC IIIs and the like, I don't know.

 

closed loop is idle,cruise. any aceleration it drops back to open loop. more like 10% throttle max.

 

You could use IED's with the PCIII, but why would you want to? IED's affect only closed-loop mode, which is basically the cruise range, and does nothing while in open-loop mode. Thus, there is no adjustment to anything above about 60% TP and around 3k RPM. If you did use the two together you should zero the cruise range so the ECU is continually adjusting for the richer values called for by the PCIII's base map.

If you want 14.2 (or whatever) in the cruise range, just set the PCIII values accordingly. Unless you have a PCV with Auto-Tune you can't determine exact AFR without a dyno or AFR meter, but you can reduce the values in the cruise range incrementally until you're happy with the performance.

 

I've never heard anyone declare the exact point when closed-loop ends on a Harley, but I've heard about 3k RPM and 60-70% TP. I'd like to know that tidbit, though.

 

It is my understanding that closed loop idle was after it warmed up to a certain point. I've also heard that open loop starts from anywhere between 50-80% throttle depending on rpm's and some other parameters. By no means do I claim to be an expert. 10% throttle? I really don't think I'm in open loop that much.

 

ever do a data log with a sest?? or look at sest or a sert map??? both will tell you exactly where closed loop is.

 

That didn't take long, Gary7. Well done.

 

cooler idling,cruise,maybe. better acceleration,aint happening.

 

Why not? Part throttle roll-on is closed loop. You increase the AFR from 14.7 to 14.0 under those conditions, the engine will make more power.

 

when you rollon the throttle any tech that has work with efi will tell you map drops your out of closed loop.