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Consistent feedback knock/fine knock when depressing throttle.

1282 Views 0 Replies 1 Participant Last post by  olenderc
I'm running Cobb OTS Stage 1 91v300 on 93 octane fuel. Car is a 2013 WRX.

Tune has been running fine, no knock on WOT, only I occasionally see a -1.4 blip or so randomly at partial throttle. Seems like it's usually during sudden minor throttle changes. I always drive with the accessport on and live monitoring feedback knock and fine knock learning, which is why I noticed this sudden change in behavior.

Just today, however, I noticed when shifting around 3k - 4k or higher, I'll get a consistent and reproducible -1.4 knock and around that area, upon lifting my foot off the throttle to change gears. Doesn't happen much at all if I shift at lower rpm's mainly below 2.5k.

First log is shifting from 1st, through 3rd: https://docs.google.com/spreadsheet/...nc&usp=sharing

Second log of 3rd gear partial throttle rev then letting off gas: https://docs.google.com/spreadsheet/...3c&usp=sharing

Third log is of a short WOT in 3rd gear, notice no knock really until the end when I'm letting off the throttle: https://docs.google.com/spreadsheet/...1E&usp=sharing

Haven't seen this before, I'm not sure what would suddenly cause this, and I'm not sure if this is something to worry about. Thanks for your time.
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