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Bump. I think the below values/factors are some of the things to look out for...
- Lamda (AFR) needs to be around 12 at WOT. (14.7 is stoich where all the fuel is used.)
- Knock Detection should be as close to zero as possible and not appear at WOT.
- Knock Detection followed by major timing pulls is really bad.
- Knock Voltages (for two sensors) should be monitored to look for hidden knock events.
- Short Term Fuel Trim (STFT) should be around 1.0, which means the fueling is perfect. 0.7 would indicate fuel is being cut while 1.3 means fuel is being added to meet the target AFR.
- Ignition timing values should be small. A lot of different timing values with large adjustments across the four banks could indicate pulled timing to prevent detonation.
Note: There appears to be some disagreement on the ignition timing values. Some say timing adjustments should be no more than 2-3 degrees at WOT for a well-tuned and mechanically sound car, and all four banks should be the same. Others say not to worry about the banks having different timing adjustments at WOT because that shows the DME maximizes power while controlling timing across the individual banks separately. In other words, ignition timing values of 3.0 across all banks provides a pretty log, but means you are leaving some performance on the table.
What else should we monitor for knock or other conditions that can be catastrophic?
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