Help me Increase my Air Charge Max!

FK2 Civic Type R 2015-2017, FK8 Civic Type R 2017-2021, FL5 Civic Type R 2023+ and Integra Type S 2024+
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m_kluch
Posts: 16
Joined: Sun Feb 15, 2015 7:06 am

Help me Increase my Air Charge Max!

Post by m_kluch »

I've been trying to raise my airc_max for the past couple of weeks and can't for the life of me figure out what's keeping it down below my target air charge numbers set in the boost section. I've raised some tables that I thought could be limiting me but don't understand what some of them do.
Mods are:
P600 turbo
XDI HPFP and 1400cc injectors
DW300c pump
PRL intake w/Race maf
MAP exhaust
Perrin Intercooler

Here are a couple of 4th gear WOT logs and my calibration. Any help would be greatly appreciated.
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FK8_Hoonigan
Posts: 48
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Location: OH
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Re: Help me Increase my Air Charge Max!

Post by FK8_Hoonigan »

Your hitting your defined AirC Limits

Doing what its supposed to.
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2021 R-39464
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Caustic Gnostic
Posts: 10
Joined: Tue Apr 22, 2025 6:37 pm

Re: Help me Increase my Air Charge Max!

Post by Caustic Gnostic »

I see the airc_max limiting the air charge in your logs. The limit in the table is 239%->233% but the airc_max goes from 222%-216% for some reason and the actual air charge follows the airc_max values. I have seen very similar instances in my own logs and I think they may be related to the KFMIOP and KFMIRL tables relationship to each other.

Those two tables should make sense relative to each other, for example in your KFMIOP table 170% AIRC at 7240 RPM equates to 82.2% of max torque. However in your KFMIRL table 82.2% torque at 7240 RPM requires 264% AIRC (instead of 170%). I don't know for sure if this was intentional on your part or just an accident from increasing column values to get more AIRC, but I think your issue may get better if you go back to the tables that hondata created for the 250% mod. If it still does not go away from that, my next guess would be that the limit is due to knock window tables seeing some type of noise at higher RPM and limiting the airc_max because of it.
m_kluch
Posts: 16
Joined: Sun Feb 15, 2015 7:06 am

Re: Help me Increase my Air Charge Max!

Post by m_kluch »

Caustic Gnostic wrote: Tue Jun 16, 2026 10:25 pm I see the airc_max limiting the air charge in your logs. The limit in the table is 239%->233% but the airc_max goes from 222%-216% for some reason and the actual air charge follows the airc_max values. I have seen very similar instances in my own logs and I think they may be related to the KFMIOP and KFMIRL tables relationship to each other.

Those two tables should make sense relative to each other, for example in your KFMIOP table 170% AIRC at 7240 RPM equates to 82.2% of max torque. However in your KFMIRL table 82.2% torque at 7240 RPM requires 264% AIRC (instead of 170%). I don't know for sure if this was intentional on your part or just an accident from increasing column values to get more AIRC, but I think your issue may get better if you go back to the tables that hondata created for the 250% mod. If it still does not go away from that, my next guess would be that the limit is due to knock window tables seeing some type of noise at higher RPM and limiting the airc_max because of it.
Thank you for the feedback. Yes, I intentionally increased values in those tables to try to solve the issue. I tried going back to the stock values in these tables and the “air charge max” got even smaller. 210% at 7000rpm. I may just leave it alone for now. My fuel pressure can’t hold command past 6300 rpm anyways when I’m above E30….
m_kluch
Posts: 16
Joined: Sun Feb 15, 2015 7:06 am

Re: Help me Increase my Air Charge Max!

Post by m_kluch »

FK8_Hoonigan wrote: Tue Jun 16, 2026 12:08 pm Your hitting your defined AirC Limits

Doing what its supposed to.
My defined AirC limits are set under the Boost section. They are higher than what I’m achieving when going WOT. Boost pressure is following Boost pressure command but the air charge is not reaching my desired limits. There is a “airc_max” in the sensors display that’s limiting my boost.
jeffx
Posts: 158
Joined: Tue Apr 16, 2019 2:19 pm

Re: Help me Increase my Air Charge Max!

Post by jeffx »

As Caustic Gnostic pointed out, your KFMIRL/KFMIOP tables are not in agreement. Correct that first and then see if you still have the issue.
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