Knocks in CYL 3#

FlashPro questions & answers specific to the 2006-2011 Americas Civic Si
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ivanB1
Posts: 5
Joined: Wed Jun 05, 2019 1:31 pm

Knocks in CYL 3#

Post by ivanB1 » Tue Aug 13, 2019 7:50 pm

Hello, i have a civic SI 2011 with just K&N SRI.

In a 30 min datalog i had 77 knocks only in the cylinder 3 and always at the same RPM range. (2750-3000) and in part throttle. In full throttle the AFR is OK and no knocks. Im wondering if is real knocks that i need to reduce the timing in those RPM range or are false knocks because of the resonance at 3000 rpm with the intake. I can't upload the datalog because is too large. what do you think, real or false knocks?.

Thank you

EFICU
Posts: 47
Joined: Mon Feb 25, 2019 10:14 pm

Re: Knocks in CYL 3#

Post by EFICU » Tue Aug 13, 2019 11:45 pm

ivanB1 wrote:
Tue Aug 13, 2019 7:50 pm
Hello, i have a civic SI 2011 with just K&N SRI.

In a 30 min datalog i had 77 knocks only in the cylinder 3 and always at the same RPM range. (2750-3000) and in part throttle. In full throttle the AFR is OK and no knocks. Im wondering if is real knocks that i need to reduce the timing in those RPM range or are false knocks because of the resonance at 3000 rpm with the intake. I can't upload the datalog because is too large. what do you think, real or false knocks?.

Thank you
Have you tried reducing ignition in those areas and see if the knock goes away? Part throttle and full throttle don't spend too much time in similar parts of the tables, so chances are it is real knock.

If you want to email me your datalog, and the tune file you are driving on, I can take a look at it and see what it looks like. Email them to me at eficalibrations@gmail.com

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