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Old 10-02-2012, 08:02 PM   #1
Pickler
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Default car stays in closed loop at WOT

during wide open throttle acceleration car stays in closed loop until i cross 4000rpm (A/F ratio is about 14:1 until past 4k rpm). also during cold starts if i apply throttle or change gear it switches to closed loop plus it goes from high rpm idle to low rpm idle. is this normal? thanks.
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Old 10-02-2012, 10:11 PM   #2
Counterfit
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My car goes to low idle after even thinking about the gas pedal on a cold start.
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Old 10-02-2012, 10:35 PM   #3
Pickler
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Quote:
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My car goes to low idle after even thinking about the gas pedal on a cold start.
i see i don't understand why it goes to closed loop because of this.
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Old 10-02-2012, 10:46 PM   #4
Counterfit
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I can't help you there.
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Old 10-03-2012, 12:25 AM   #5
Pickler
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I can't help you there.
oh another subaru puzzle
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Old 10-03-2012, 12:34 AM   #6
Counterfit
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Not necessarily, I just don't have any experience with actually tuning these (or any other) cars, outside of very vague ideas of what's good or bad. AFRs < 10 are bad.
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Old 10-03-2012, 06:15 AM   #7
NH8991
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Quote:
Originally Posted by Pickler View Post
during wide open throttle acceleration car stays in closed loop until i cross 4000rpm (A/F ratio is about 14:1 until past 4k rpm). also during cold starts if i apply throttle or change gear it switches to closed loop plus it goes from high rpm idle to low rpm idle. is this normal? thanks.
From checking my previous logs it's normal. Almost seems like it stays in closed loop until changes are happening too fast for the ECU to keep up.
The idle thing is normal too.
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Old 10-03-2012, 05:43 PM   #8
Pickler
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From checking my previous logs it's normal. Almost seems like it stays in closed loop until changes are happening too fast for the ECU to keep up.
The idle thing is normal too.
reason im asking is cause my afr stays at 14s up until 4000rpm at wot .
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Old 10-03-2012, 10:04 PM   #9
NH8991
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Quote:
Originally Posted by Pickler View Post
reason im asking is cause my afr stays at 14s up until 4000rpm at wot .
Looking at some old logs (with the stock tune) I see the same, AFRs started to drop below 14 at around 4000rpm, however the car was still in closed loop until well past 5000rpm.....
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Old 10-04-2012, 12:13 AM   #10
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There is a closed loop to open loop delay. The delay is a series of values and threshold that have to be met/exceeded in addition to an actual delay period that has to expire before the ecu will switch to the open loop fueling tables. There are some circumstances where some of the criteria can be ignored but without actually changing the delay counter to a lower number like zero or close to zero, it will not switch to open loop instantly. It's a trade off of emissions/economy for power.
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Old 10-06-2012, 12:05 AM   #11
Special J
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It's not in closed loop until 4k, that's just usually the current RPMs when the CL/OL delay threshold is exceeded. Go run in fourth WOT from near-idle up a long steep hill, and you'll see it go rich (transition to OL) lower than 4k, because the same counters are incrementing themselves the same number of times per second, but it takes more time to get the revs up. Dunno what the geography's like in your area of the Great White North, but I see it all the time here in Denver.

On the cold start thing, it's probably as simple as the ECU being programmed to go into normal drive mode (CL) when it looks like the driver wants to start driving before the normal transition delay threshold is met. I get in mine when it's cold and put the stick in neutral, start the car, and don't touch any pedals after letting the clutch out, and it stays at high idle until the coolant is warmed up. I forget the exact temp, it hasn't been that cold here in a while. Seems like that way it'll get itself up to temp as quickly as possible if left alone, but if master says go, it'll change plans and go.
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Old 10-06-2012, 12:09 AM   #12
Counterfit
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Adding to that cold start stuff, I can manage to not touch my gas pedal until the end of my street. Living on a hill FTW.
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