Knock Issues

[CrawlinZX14]

Ok, so I started logging my car a while back. I was getting knock all over the place, and some as high as 40's. Found that was simply a bad knock sensor. Or so I thought. Today I pulled the old o2 out and swapped in a new one. put her in finger tight and then a 1/4 turn more max. Fired the car up after and went for a lil drive. It seems like everything else seems to be sitting pretty as far as fuel trims, TPS, and everything really. Max under WOT I hit 70% duty. Now the problem I have is that I rolled up to a stop sign. When I started to roll off the stop I pulled 43 knocks, and the log was all over the place for the knock. I know its not bad fuel. I know there was NO boost at that point as I was only at about 1600rpm when it started. Base fuel pressure is set where haynes says it should be with the vac line disconnected and plugged off. Base time looks good, and the car runs fine other than knocking. I have 680's on wastegate boost on a 50trim, so im only boosting about 12psi. I will upload a log in the afternoon. Its rather large and really dont feel like uploading now and putting it to excel right now. The only thing I do not have installed yet is the wideband. Just picked up the sensor today and didnt have time to get it in yet.

Any thoughts of what could be causing some odd knock. Over the past 2 weeks I have not found any pattern to this knock at all yet. Granted today was the first day on the new sensor. Still had no pattern to it. Nothing to do with load, or boost levels or anything like that. The conditions never match up from one case of knock to another. Not load, boost, rpm, nothing. Could this be a horrible case of phantom knock? Or is my car telling me it hates me.

Basic rundown is: 50 trim, 2.5" pipes, fmic, AFPR, 680's, GM maf, HKS SSQ, 1glink logger, MAF-t

Running 12psi on 93octane.

Any thoughts on why I would get random knock?

 

[stars]

Knocking could come from internally. The sensor is picking some kind of harmonics that is out of acceptable range. You could have play in connecting rods or wrist pin slapping the side of the cylinder wall (s) when the engine is put under a load. Normally a knock is fuel related and if you have ruled out the fuel as the cause then you have one other choice. Remember there is a difference in a pinging noise and knocking noise, so without hearing it I cannot tell you which you have for sure and is it normal?. If the noise is loud enough the knock sensor can pick up that frequency from a long distance away from the sensor.


From the Manual:

DETONATION SENSOR <Turbo>
The detonation sensor is installed at a position where it can
detect, with a high degree of precision, knocking generated at
each cylinder; it detects cylinder block vibrations caused by
knocking, and outputs voltage proportional to the magnitude of
those vibrations.
Because cylinder block vibrations caused by knocking vary
from engine to engine, the engine control unit passes this
through a frequncy filter, detecting only the knocking, thus
resulting in a spark retardation of the ignition timing that
corresponds to the strength of the knocking.

Lower your boost and see what that does for now? When you get the wideband then you can play with your boost from there perhaps?

I like the type-O in the service manual: "frequncy"