I'm aware. I've modified the build I'm running to ignore frames with corrupt data as these inevitably get picked up as knock events. See here. Some of my logs have as many as 300 trashed frames, but my commute is about 65 minutes each way so that's a lot of data. I think this might be a y-body quirk but haven't had the time to investigate further.
Always.
It was my understanding that burst knock is pre-emptive timing retard that is added to compensate for the lack of a pump shot. I would have to review all the code again, but as I recall all of steve's knock analysis routines only plot an event if knock count increments [edit] regardless of if there's knock retard.
Did you possibly mean "increasing counts without retard" in the last sentence? If so I think what you're getting at is knock in MAP cells lower than 45kpa generates no KR. Got it. [edit] If I cover up the knock plot with my thumb so I can't see anything to the left of 45kpa I'm no less freaked out.
I'm going to get it on a lift tomorrow and verify, but yes. I see nothing to indicate the exhaust is touching anything. I'm going to put a fuel pressure gauge on it tomorrow too - I installed a new racetronix 255l/hr pump before I started doing any serious tuning and pressures were good after that so I didn't think about it further.
Pretty sure. Delco 10456126 both replaced during build.
Logging tonight in OL wasn't as good as I'd hoped - the knock plot isn't great (456 points in ~60 miles). But I still feel like it's running leaner than I'd like b/c I filled up and calculated 22.3 mpg for today. Seems unlikely with the way I drive. But some logs from last week were in the neighborhood of 1100 events.
I feel like some of what's getting picked up as knock may be misfires / lugging that gets amplified by the drivetrain. It's a 22 year old car and has rattles and squeaks like any other with 160,000 mi on the odometer. Maybe I'm operating it in a load range that the cam won't allow except with dense air.
Thanks for bouncing the ideas around - always good to discuss with someone who's been there and done that!
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