Open Loop EQ Ratio
07-13-2013, 09:31 PM
#1
Open Loop EQ Ratio Ok, so I am doing the learn at home tuning from the tuning shool and I have a questions about the OL EQ Ratio.
With the car up to temperature and in closed loop, my LTFT are within 3%.
The problem I am having is that when I start the car when it is cold, the car will be in open loop, I read the max value (16AFR) on my AFX NGK wideband even though I am commanding between 12AFR and up.
Do I just keep adding to the open loop EQ ratio until I see stoich on my wideband when in open loop?
With the car up to temperature and in closed loop, my LTFT are within 3%.
The problem I am having is that when I start the car when it is cold, the car will be in open loop, I read the max value (16AFR) on my AFX NGK wideband even though I am commanding between 12AFR and up.
Do I just keep adding to the open loop EQ ratio until I see stoich on my wideband when in open loop?
07-14-2013, 09:30 AM
#2
Mine does the same thing but I don't trust my wideband until it warms up. I assume it is probably reading leaner than actual.
I have thought about keeping the key on for 20 minutes before a cold start to see if it would make a difference but never have because my cold starts are fine and I haven't needed to adjusts.
I have thought about keeping the key on for 20 minutes before a cold start to see if it would make a difference but never have because my cold starts are fine and I haven't needed to adjusts.
07-14-2013, 10:00 AM
#3
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Things like the AIR pump cycle will jack the exhaust
oxygen content. You might need to suppress that if
you want good readings.
But especially on cammed vehicles, you'd be better
off tuning to what-it-likes (using something like MAP
reading as your indicator, and seeking the lowest
MAP / highest vacuum) than tuning to an arbitrary
number, for open loop.
oxygen content. You might need to suppress that if
you want good readings.
But especially on cammed vehicles, you'd be better
off tuning to what-it-likes (using something like MAP
reading as your indicator, and seeking the lowest
MAP / highest vacuum) than tuning to an arbitrary
number, for open loop.
07-14-2013, 04:55 PM
#4
Things like the AIR pump cycle will jack the exhaust
oxygen content. You might need to suppress that if
you want good readings.
But especially on cammed vehicles, you'd be better
off tuning to what-it-likes (using something like MAP
reading as your indicator, and seeking the lowest
MAP / highest vacuum) than tuning to an arbitrary
number, for open loop.
oxygen content. You might need to suppress that if
you want good readings.
But especially on cammed vehicles, you'd be better
off tuning to what-it-likes (using something like MAP
reading as your indicator, and seeking the lowest
MAP / highest vacuum) than tuning to an arbitrary
number, for open loop.
I have deleted the air pump on my car. But I will try to look at my map readings during open loop ( BTW i am speed density tune)
07-14-2013, 04:57 PM
#5
Mine does the same thing but I don't trust my wideband until it warms up. I assume it is probably reading leaner than actual.
I have thought about keeping the key on for 20 minutes before a cold start to see if it would make a difference but never have because my cold starts are fine and I haven't needed to adjusts.
I have thought about keeping the key on for 20 minutes before a cold start to see if it would make a difference but never have because my cold starts are fine and I haven't needed to adjusts.
07-15-2013, 08:59 AM
#6
I would also consider the fact that you may never get a complete and efficient burn at cold startup, and if you don't get a clean and sufficient burn, there will be oxygen in the exhaust showing a lean condition with the wideband when it is actually not lean.
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07-22-2013, 11:17 PM
#11
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does this apply to say a 99 ls1 with headers and cai? i see that the table looks much better in terms of smoothness and uniformity than my 99 stock one. is this your reasoning behind this statement? not doubting you at all, just in my nature to know why.
07-23-2013, 09:07 AM
#12
I've a toggle switch to my NGK AFX for un switched power so I can watch the WB while doing cold starts. Cold start like mid to hi 13's. As Jiimmyblue mentioned this is what the motor likes, I've a wee bit of a cam.
Then you can watch each temp column & add or take away fuel, remember the column's blend from one to the next. I learned that the commanded while warming up will never match my WB, so I adjust that table for warm up's based on the WB readings.
Then you can watch each temp column & add or take away fuel, remember the column's blend from one to the next. I learned that the commanded while warming up will never match my WB, so I adjust that table for warm up's based on the WB readings.
Toque? 