I've taken a log file in idle with and without AC and got some very interesting stuff
config:
https://docs.google.com/file/d/0B6l1SB-S-teyaW1XODdjRGFNVlk/editLog:
https://docs.google.com/file/d/0B6l1SB-S-teyTzYyZjMxLWRCT0U/editHere is a pic with the summary of what i saw - i've plotted points on it to explain my understanding on them:
Point A: Start of the file (no A/C). You can see the idle is 941 rpm. You can see EGO correction is 93% and gamma enrichment is 87%.
The correction is so high because of the MAT/TPS (default to 94%) and MAT temp of 46 degrees. I can (and) will tune it to minimal correction - but as MAT temp changes, it will go off scale again.
Point B: Then i press the throttle a little bit and you can see the excessive AE kicking in. You can see that RPM a little below 900rpm. Then it settles down and lambda is getting back to 1.
Point C: I push harder on the throttle. This time mixture is getting lean before settling down (i dont have a clue why - probably related to AE tuning). RPM again got below 900.
Point D: I then turn on A/C. you can see that EGO is off since its tuned now to stop below 800 (RPM dropped to 790). You can see mixture is rich (no EGO to correct).
Point E: I then press a little on the paddle Get richer because of AE and rpm drops to 600 and recover.
Point F: Now i press a little harder, rpm drops to 500. almost stalls - and recovers.
Point G: Then - something interesting happens! lambda is almost ok now. around 0.98! The thing is that at that point, the fans kicked in on high speed - voltage dropped from 13.76 to 12.5! So this means that injector opening time got slower - leaning the mixture.
you dont see it in here, but i turned off the A/C and EGO went back at 100/101% correction - because of the lower voltage.
So besides the A/C problem. I have an issue with the fans kicking at high speed - voltage is dropping and if i was boosting - it could be very dangerous to the engine!
How can i compensate the lower voltage?