by honki24 » Wed Oct 08, 2008 7:57 am
Some oscillation is normal. I'll post a screenshot. The screenshot is from a 5th gear cruise last night. It oscillates ~.5AFR altogether but that is the nature of how an O2 sensor feedback loop works. Make sure you use smoothing when looking at AFR. What you see there I believe has a smoothing factor of 2 added to it b/c its very "fuzzy" without any smoothing. (I smooth my boost, EGT, and AFR)
If you put "14.7" in the box it will cycle around 14.7. Probabbly go from 14.1-15.3ish. That's no big deal. That's how it should work. Just put something like "15.7" in there so that it oscillates around 15.7 AFR. Your setup is different b/c I have no EGR any more but you may find you need to add some timing when leaning out more because you will lose power by leaning out another point. ~5 degrees will do it. Just do some logs beforehand where you log knock and then change timing and AFR and log more and see if you get more knock. If so then back off the timing a bit.
For scaling: I have an LC-1 and I use PLX scaling and I've changed my LC-1 output to match the PLX. I do this for better resolution, but to answer your question: yes it will simply work if you set it to LC-1 and log. Like I said though, use a small amount of smoothing when tuning the AFR. Makes things much easier.
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