I made a video of the drive when I was logging. The second of the 4 pulls is at 1:50 into the video with datazap overlay. As one can imagine from the rest of the video it's pretty difficult to find a flat level road here. The one in the video runs along a river, that's why I'm pretty sure it's level. There are a lot of roads here that looks level but has a lot of gradient, which becomes apparent when doing pulls in both directions.
[ame="https://www.youtube.com/watch?v=Hw0JiDWUpBc"]DIY tuning: Performance check... - YouTube[/ame]
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Originally Posted by Kodename47
Yes, in open loop you don't need commanded and actual AFR to match.
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Thanks for the explanation. It's good to know there are other options than messing with the MAF. Which I would rather not touch anymore except to richen up the top a bit if LTFT doesn't take care of that eventually (crap weather here again).
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Reverse that logic  Unburnt fuel isn't measured by the sensor, so it can't read richer than the burnt mixture. It can read leaner than the total fuel injected, but not the other way around.
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I had to read this several times and my head is about to explode thinking about what unburnt fuel may do to an O2 reading.
You say "it can
read leaner" i.e it's actually richer, where Wayno say it "may actually
be lean". If the O2 sensor just reads the oxygen ratio, isn't all what unburnt fuel can do just to dilute the remaining composition of the exhaust gasses? Which in terms would mean the sensor reads less oxygen (rich?) - In that the
reading is rich and the actual combustion is
leaner than the reading? Or where is the fallacy?
Arggg my head is slowly exploding in a lean, knock filled detonation! Got to think of something else quick!!
(Ahh, now I'm feeling better again.
)
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A more stable AFR is ideal, you want it to gradually richen up. For the sake of a quick tweak to the fuel map, it's an easy fix. Helps with EGTs etc, the timing curve I'd imagine is smooth so you don't want it too rich when the timing advance is less. You want them to almost be the reverse of each other.
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As you can see the car hauls pretty good now. So on one hand, I am inclined to leave it as it is as Wayno suggests. On the other hand, I am curious by nature and yes, being a perfectionist, the bump bothers me. If I was to apply corrections to OL: Would this look in a reasonable order?
Markers at 3200, 3600, 4000 and 4400 rpm:
Log here...
