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Old 09-13-2007, 09:45 PM   #1
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Default EGO Control settings

Fellas, what are you doing with your closed loop controls?
Mine's
Controller Step Size 1%
Controller Authority +/-5%

Seems a little stingy
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Old 09-13-2007, 09:50 PM   #2
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1%
10%
active above 500RPM

when/if i ever use it. otherwise i have it off, technically i dont even need an o2 sensor.
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Old 09-13-2007, 09:52 PM   #3
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oh, and I think I found one of my issues
Under More Settings::Open Loop Mode, I have Open Loop O2 correction set to KPa, go Open Loop @ 54KPa

I think that should be more like open loop after 120 KPa or something.

Or should I set it to throttle position, since I have a linear TPS now... and then under More Settings::Lambda Sensor Targets, set the Change Ego Limit above KPa to say like 120KPa, and Change Ego Limit to +- 0
If I interpreted it correctly, that would mean fuel would stay closed loop until over a certain TPS value with the first setting, and would stay closed loop until a certain MAP value with the second setting.

Jerry? What ya think man?
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Old 09-13-2007, 09:52 PM   #4
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Same as Braineack active above 700.
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Old 09-13-2007, 10:24 PM   #5
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cool thanks, how is idle quality? hunting?
I'd think that open loop would be better for idle smoothness and quality, and probably the same for really low rpm, light load (like moving up in rush hour traffic)

Mine is active over 1500
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Old 09-13-2007, 10:25 PM   #6
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I think Scott still has the stock ECU controlling idle, so it'd be a bit different situation than ours.

BTW: MegaTweak3000 (want to play with that this weekend) manual recommends to put it at low authority levels when you're decently tuned...can't remember exactly what, but think it was 1% 5%?

edit:
"How to get a good datalog.
In my testing I've found that setting the O2 +/- limit (in
MegaTune) to 100% works great for setting up a really rough map
or starting from the baseline VE map that comes
preprogrammed in the controller, and if your map is more or less
tuned in 50-70% will work too (keep this high though for tuning).
The critical settings are O2 step% and ignition events per step.
When tuning anything in the lower RPM range (1000-3000 rpm),
set step% to 1 and ignition events to 32 (2000 rpm with a V6 =
100 events per second = about 3% change in a second). Then
when tuning the higher rpm's with a rough map; step% at 3 and
ignition events to 64 (about 3.5 changes per second at 4500
rpm). Once things settle down a bit when the map is tuned better I
set step% to 1 and ignition events to 72, which gives the closed,
loop control some more stability and allows for better fine-tuning
at the higher rpm's.
Here is the formula for figuring out your O2 adjustments per
second: ((rpm/120) * cylinders) / ignition events per step. For
fine-tuning I like to keep O2 adjustments per second between 3
and 5 for the particular rpm bands I've been tuning. Roughing in
maps try to stay between 5 and 10 (depends on how good the O2
sensor is, if it's old go slower).
Once the map is tuned in I set the limit to 5% (it can go higher
depending on how questionable the map is) step% to 1 and ignition
events to a value that would switch about 4x a second at your
average cruising speed."
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Old 09-13-2007, 10:29 PM   #7
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mine is off. i do a datalog to check the AFR every couple months or so. probly just take out the O2 soon.
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Old 09-13-2007, 10:52 PM   #8
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Quote:
Originally Posted by Ben View Post
oh, and I think I found one of my issues
Under More Settings::Open Loop Mode, I have Open Loop O2 correction set to KPa, go Open Loop @ 54KPa

I think that should be more like open loop after 120 KPa or something.

Or should I set it to throttle position, since I have a linear TPS now... and then under More Settings::Lambda Sensor Targets, set the Change Ego Limit above KPa to say like 120KPa, and Change Ego Limit to +- 0
If I interpreted it correctly, that would mean fuel would stay closed loop until over a certain TPS value with the first setting, and would stay closed loop until a certain MAP value with the second setting.

Jerry? What ya think man?
I'd go closed loop until over about 70% TPS and then open. Or if you use kpa then maybe 80-90kpa, but I'd use the TPS personally, 70%.

See you in the morning man...
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Old 09-13-2007, 11:03 PM   #9
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Ben--Good call man

Al--I agree with ya, but I like my WB gauge. Maybe it's the pretty flashing lights.

Jerry--Thanks
... I'll see if I can get Deborah to bring us some breakfast.
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Old 09-13-2007, 11:12 PM   #10
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Cool-- and if you're still around come lunchtime I've already told my crew I'm ordering pizza so you're good to go there....
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