Knock

FlashPro questions & answers specific to the 2008+ Accord, Americas and international
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espina936
Posts: 6
Joined: Tue Mar 16, 2021 7:26 am

Knock

Post by espina936 »

I am running Stage 2 flash on a 2019 Accord Touring 2.0. I have a brief datalog that shows apparent knock on cylinder 3. Nothing too egregious. I do see knock retard going to 8% at WOT at times. Anything I should be concerned about.
datalog0006 4.5.21.fpdl
(998.59 KiB) Downloaded 7 times
espina936
Posts: 6
Joined: Tue Mar 16, 2021 7:26 am

Re: Knock

Post by espina936 »

I am also seeing knock control fluctutae from 50% to 80%, which seems high.
espina936
Posts: 6
Joined: Tue Mar 16, 2021 7:26 am

Re: Knock

Post by espina936 »

Reflashed Stage 2 calibration to verify. Attached datalog. Same results with 6 knock count and knock control at around 76%.
datalog0009 4.5.21 v2.fpdl
(238.46 KiB) Downloaded 8 times
I flashed Stage 1 calibration to verify, the car did the same under WOT. Increased knock with elevated knock control numbers.

Background, I'm running PRL HV Intake and catted downpipe and HPS charge pipe. Car has only been filled with Premium gas 91 to 93, mostly 93 if I'm not mistaken. Car has 8k miles. At almost a full tank now. I'm assuming the total knock and knock control are both out of spec of what I should be seeing.

Any feedback is welcomed and encouraged.
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Hondata
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Re: Knock

Post by Hondata »

A couple of knocks on one cylinder is nothing to be concerned about. Likewise knock retard by itself is nothing to worry about because the ECU will show knock retard even if there is no knock. That's how Honda ECUs work.
The knock control will normally go up and down, with lower being better. In your case you could remove a little timing at the point where you see the knock control rising from the knock ignition limit table.
Hondata
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