2015 civic si sedan

2012+ US/Canadian Civic Si / 2013+ ILX
Edward12
Posts: 27
Joined: Sat Apr 17, 2021 7:31 pm

Re: 2015 civic si sedan

Post by Edward12 »

Here is datalog16. Let me know what you think.
Attachments
datalog16..Rev09.5..4th gear pull 4000-7000 rpm.fpdl
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EFICU
Posts: 635
Joined: Mon Feb 25, 2019 10:14 pm

Re: 2015 civic si sedan

Post by EFICU »

I think we're finally there, no knock on this one. If you can, make another complete 20 minute datalog on Thursday or Friday with a fourth gear pull. If it all looks good then we can call it good to go.
Edward12
Posts: 27
Joined: Sat Apr 17, 2021 7:31 pm

Re: 2015 civic si sedan

Post by Edward12 »

Here is datalog17. I feel a little bit of power lost. Let me know how the log looks. Let me know if you're able to put a little more into it or are we maxed out for now.
Attachments
datalog17..Rev09.5..4th gear pull.fpdl
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Edward12
Posts: 27
Joined: Sat Apr 17, 2021 7:31 pm

Re: 2015 civic si sedan

Post by Edward12 »

The power lost is low to mid range. If there is nothing else we can do for now other then cleaning up the knock I’ll be good with it until I get some part in. Let me know how it’s looking.
EFICU
Posts: 635
Joined: Mon Feb 25, 2019 10:14 pm

Re: 2015 civic si sedan

Post by EFICU »

Let me go back and look through trends of the knock and see which cylinders are most sensitive to see what I can find. Last time I did look for the trends, it seemed like each cylinder has experienced knock at some point. Meaning one time it was cylinder 1, the next time cylinder 3, then cylinder 2 the next. If it was all in one cylinder I would say to check plugs and other ideas. I could also reduce the ignition in that one cylinder, if only one cylinder was our culprit of course. The fact that one of the four cylinders is sensitive on each pull is what makes it difficult.

The way 9th gens work is that you have to valley the ignition in the mid range for knock. Something about the way the intake manifold is designed requires this. On an 8th gen, you leave the ignition pretty much flat throughout the rpms range. I've got you down to around 12* of ignition in the valley and it is still producing knock.

All I can really do remotely is remove the knock as best I can. Then if you plan to get a dyno tune at some point, my only hope is that the tuner focuses on the knock and not just tune it for power and send you out the door producing large amounts of knock. Which I have seen on numerous occasions and it's frustrating. Hondata states that some knock is not a big issue, I don't take that chance with other peoples cars. All I can really do is try to get it as safe as possible for you guys so you can have fun with it.

Let me go back and look through the trends as I mention I'll see what I can come up with. Maybe some cam angle changes might reduce the sensitivity, but I will see what I can do.
EFICU
Posts: 635
Joined: Mon Feb 25, 2019 10:14 pm

Re: 2015 civic si sedan

Post by EFICU »

Haven't forgot about you. Been a chaotic couple days and I'm trying to finish a plan for your setup. Hopefully I'll have something for you tomorrow night.
Edward12
Posts: 27
Joined: Sat Apr 17, 2021 7:31 pm

Re: 2015 civic si sedan

Post by Edward12 »

Sounds good. I appreciate everything you have done.
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