knock question - Subaru WRX Forum
 
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#1 Old 08-17-2014, 07:03 PM
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knock question

.. i know the goal here is zero, but with cobbs ots stage 1+sf 93 im getting fine and feedback knock, sometimes like -1.4 occasionally. once i got -7 as a max, but it was a single time. everything appears to be running fine, good power, hitting 17psi w 3.31 hwg tune.

basically my question is, in the real world environmental is the occasional fine and feedback knock of -1.4 / -2.11 acceptable or is something amiss?

thanks
pete
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#2 Old 08-18-2014, 09:09 AM
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Found this, for the record if people search for this topic

https://cobbtuning.zendesk.com/hc/en...ck-on-a-Subaru

And this

https://static.cobbtuning.com/cobbtu...20FAQ%20v2.pdf
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#3 Old 08-18-2014, 11:59 AM
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Im running a 91 3.11 Stage 1+SF Map ( had issues with the 3.3x maps you can view the thread here Cobb 3.3x Maps )

That said I have spent a few hours in the SoCal Cobb store and on the phone trying to weed out underboost issues with Cobb. We had a chance to talk about log parameters and I got a schooling in most of the parameters. from my understanding Fine Knock Correction often tricks itself when there is no knock event to speak of. When you get on the throttle hard you can get knock correction because the sensor sees a change in the noise, noise is read sometime by the knock sensor like when you step on the throttle from a high gear on the freeway.

Unless you see you Dynamic Advanced Multiplier change or the fine knock correction doesn't self resolve after it happens I wouldn't worry too much about it. That single instance where your fine correction read 7 might be a sign of poor quality fuel. If it goes as far as 7 then you might want to try the LWG map and run a low intensity log. if you are seeing -1.4 or -2.11 on occasion but they resolve during WOT pulls then you should be OK.

That said take a few logs and post them so we can help you make sure everything is happy. That reminds me I need to take a log, Be Right Back : )

Jason
13 WRX Hatch
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#4 Old 08-18-2014, 07:20 PM
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ok, very good. that's sort of what i figured. The Cobb guide was very insightful as well -- pretty much said what you said. Thanks!
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#5 Old 08-29-2014, 11:54 PM
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Very good info here

https://cobbtuning.zendesk.com/hc/en...ck-on-a-Subaru

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Adair
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Phatbotti tuned!
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