Just wanted to make sure my info on the Periphery bits is up to date. I am working on timing map, and some issues logging that. Wanted to know if I should disable FAA bit 9 if I am running straight pipe on track car?

bit 09. 0=Disable Cat-Warmup ignition retard tables.

 

That bit will have nothing to do with the timing map at normal operating temperature. What type of logging issues are you having?

I never disabled that bit on any of the cars I tune and 99% of them do not have cats..

 

I am working in a couple of other threads with ratsbud211 and Boostedtuning about matching my timingadv and timing map values considering knock or no knock values. One of the take aways was to disable FAA bit 10 (weird timing pull below 4k).

https://www.evolutionm.net/forums/ec...-vs-log-5.html

I backed into some things because I am trying to fine tune my timing map according to information on the 'lets see your fully tuned timing maps' thread, and doing so I noticed cruise knock. I started to tune that out by reducing timing and started noticing this other stuff about the map and expected advance not matching.

I started worrying about if I was using the wrong load formula for logging too.

I kind of got all over, so I noticed this bit and I don't have a cat in this setup, so I was thinking to turn it off. But if most never do, then its likely not a factor.

The questions started because I couldn't figure out why something like this 15 was a 12 in my map, and then if I was using the wrong load for logging.

 

Any luck with your knock issue or timing issue ?

 

I haven't resolved but it's low enough for tomorrow. Counts that is. I have pulled enough timing to feel safe on track and just got here. Laguna secs. And just came from SEMA, so i ve busy driving all over CA! I have logged on the way and cruise knock never exceeded 3. I will have tons of on track data to eval after Sunday. I'll report back when this driving marathon finishes. Thanks!!

 

No, not actually, unless you count progress by going backwards first. It seems to be worse, and I have completed a number of critical tests. I confirmed EGR table values zero'd out didn't make a difference.

I then tested for baseline issues, which showed significant knock at cruise and significant knock at peak torque, to make sure the behavior was still consistent it was. I then trial and error'd around with the knock sensitivity to make sure I understood how it worked. Those tests just confirmed I was masking the knock for lower values, so I put it back to stock sensitivity.

I then filled with a tank of 100 oct and that gave me mixed results. I would have hoped for no knock, or no change, but I got exactly in between so my results are not completely conclusive. All knock counts went down somewhat, which indicated 'real' knock was happening. However even with 100oct it was unacceptable levels of occasional 5s at cruise and sometimes higher at peak torque.

So octane made a difference, but didn't resolve. I have pulled lots of timing without a resolution, so now I am again looking at AFR, and have richened things up.

Does it make logical sense that too lean of a cruise area or otherwise would induce knock values?

Could it just be my valve springs rattling away (cosworth)?