Closed Loop Idle A/C Stalls
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Hello everyone,
I am needing some experienced opinions on my closed loop idle. I have my closed loop idle 100% where i want it with the A/C off, however, i am having an issue with stalling with the A/C on. My setup is:
Thanks in advance for your help. Jon |
Didn't open tune, but did you tune the voltage compensation, and/or are you running an NA alternator? Check Vbatt in your log when this happens.
28 deg is too much. tune afr for lowest manifold vac, focus dead time tuning on idle, not high VE regions MS2 is tough to get good idle everywhere. edit: why the heck are you running 1000cc injectors? |
Without the a/c idle up it will be difficult to catch it, especially if you are just above idle (say 1700-2200rpm) with a small TPS percentage, and suddenly release the throttle.
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Ted- All the things you mentioned have been done. GT3076r at 20+lbs requires alot of fuel, forgot to mention i was boosted lol.
Reverant - I understand the A/C idle up is important, but that's a relatively new added feature, so what did everyone do before it? So i messed with it again last night and what really helped alot was adding time to the "PID delay" from 2 seconds to 4 seconds. Also creating a valley of timing in the idle advance settings, helped a ton, which was SURPRISING cuz i expected the timing to be linear, but thats not the case. Linear timing caused oscillation, this hits a timing wall, then stabilizes it. lowest dip in idle ive seen is 700 rpm at full load (lights on, a/c, etc). Looks something like this: timing- 18 16 14 20 0 rpm delta- (-600) (-400) (-275) (0) (+400) I'll mess with it more this weekend to fine tune it, but for now its the best its ever been with the A/C on. It makes me wonder if idling lower than 950rpm be more difficult or easier, opinions? Trying to get as close to OEM idle (750-850 rpm-ish) as possible. I'll update the thread so hopefully it helps other ppl in the future. Thanks again, Jonathan |
A/C idle-up has been in the code since 2013 I think. Before that, I had the Enhanced MS2s which added the idle-up through hardware.
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