Running very rich WOT

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wesley_J
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Running very rich WOT

Post by wesley_J » Fri Jun 07, 2019 10:37 pm

I have a 2013 si and recently uploaded the reflash tune along with a injen cold air intake. During datalogs the air fuel runs as rich as 10.99:1. I was originally going to adjust the WOT Lamda fuel table but hondata suggests not going over the stock 12.25 A/F which has me hesitant , but I also read in the help section it ignores the AFCMD during open loop. Also I saw upgrading to a performance MAF would help but others say it’s overkill and will run too lean and when I look at my voltage at WOT it’s not pegged. What are your thoughts? Should I adjust the WOT fuel table, change the MAF, or run a map tune?

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Re: Running very rich WOT

Post by Hondata » Mon Jun 10, 2019 10:45 am

What are the fuel trims in closed loop? I think you'll need to change the AFM sensor calibration table.
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wesley_J
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Re: Running very rich WOT

Post by wesley_J » Thu Jun 13, 2019 12:35 pm

My fuel trims in closed loop fluctuate from 2%to -7% short term and stay a solid -3% long term.

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Re: Running very rich WOT

Post by Hondata » Thu Jun 13, 2019 1:25 pm

I would XY graph the fuel trims vs AFM voltage. If the trims increase with voltage then you'll need to tweak the AFM at higher voltages. Regardless if your short and long term trims are both trending negative then you should alter the AFM table.
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wesley_J
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Re: Running very rich WOT

Post by wesley_J » Mon Jun 17, 2019 3:30 am

So say if the ecu trims -7% from 1.2-1.4volts I should add 7% afm flow through those voltages?

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Re: Running very rich WOT

Post by Hondata » Mon Jun 17, 2019 7:08 am

No, the other way around. If the trim is negative then reduce the air flow.
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wesley_J
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Re: Running very rich WOT

Post by wesley_J » Wed Jul 31, 2019 6:30 pm

Here is a screenshot of my fuel trims starting at 1.0V the trim is 20% all the way to 3.4V 0%. I've tried reducing airflow along the voltages but it seems to not help or get worse. Reducing the airflow at 1 volt by 20% should bring it close to 0% if it was trimming that much right?
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Screenshot (1).png
xy graph afm.v/s.trim
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Re: Running very rich WOT

Post by Hondata » Thu Aug 01, 2019 9:11 am

Yes. Are you change all the values? I'd start by taking 5% off the whole table, another 5% below 2V, another 5% below 1.7 V and 5% below 1.2V (with a little blending in between).
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wesley_J
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Re: Running very rich WOT

Post by wesley_J » Thu Aug 01, 2019 11:10 am

yeah i've been changing the whole table by a little less than how much % its trimming.

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Re: Running very rich WOT

Post by Hondata » Fri Aug 02, 2019 8:56 am

Can you post the calibration too?
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wesley_J
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Re: Running very rich WOT

Post by wesley_J » Wed Aug 07, 2019 12:53 pm

here it is this is after changing it by 5% across the board like you suggested.
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AFM calibrated all voltages.fpcal
(20.94 KiB) Downloaded 16 times

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Re: Running very rich WOT

Post by Hondata » Wed Aug 07, 2019 1:40 pm

The changes are a little inconsistent. Between 1V and 3.4V there generally is -5% change, but there are odd values (1.45V 6.08->5.08, 2.85V 59.71->62).

Try this.
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AFM calibrated all voltages-2.fpcal
(20.98 KiB) Downloaded 15 times
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wesley_J
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Re: Running very rich WOT

Post by wesley_J » Mon Aug 12, 2019 3:23 pm

here is the graph after your changes looks like it helped a lot
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Re: Running very rich WOT

Post by Hondata » Tue Aug 13, 2019 9:16 am

This should be slightly better. +3% everywhere and another +3% below 1.3V.
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AFM calibrated all voltages-3.fpcal
(20.97 KiB) Downloaded 13 times
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