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Running very rich WOT

Posted: Fri Jun 07, 2019 10:37 pm
by wesley_J
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?

Re: Running very rich WOT

Posted: Mon Jun 10, 2019 10:45 am
by Hondata
What are the fuel trims in closed loop? I think you'll need to change the AFM sensor calibration table.

Re: Running very rich WOT

Posted: Thu Jun 13, 2019 12:35 pm
by wesley_J
My fuel trims in closed loop fluctuate from 2%to -7% short term and stay a solid -3% long term.

Re: Running very rich WOT

Posted: Thu Jun 13, 2019 1:25 pm
by Hondata
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.

Re: Running very rich WOT

Posted: Mon Jun 17, 2019 3:30 am
by wesley_J
So say if the ecu trims -7% from 1.2-1.4volts I should add 7% afm flow through those voltages?

Re: Running very rich WOT

Posted: Mon Jun 17, 2019 7:08 am
by Hondata
No, the other way around. If the trim is negative then reduce the air flow.

Re: Running very rich WOT

Posted: Wed Jul 31, 2019 6:30 pm
by wesley_J
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?

Re: Running very rich WOT

Posted: Thu Aug 01, 2019 9:11 am
by Hondata
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).

Re: Running very rich WOT

Posted: Thu Aug 01, 2019 11:10 am
by wesley_J
yeah i've been changing the whole table by a little less than how much % its trimming.

Re: Running very rich WOT

Posted: Fri Aug 02, 2019 8:56 am
by Hondata
Can you post the calibration too?

Re: Running very rich WOT

Posted: Wed Aug 07, 2019 12:53 pm
by wesley_J
here it is this is after changing it by 5% across the board like you suggested.

Re: Running very rich WOT

Posted: Wed Aug 07, 2019 1:40 pm
by Hondata
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.

Re: Running very rich WOT

Posted: Mon Aug 12, 2019 3:23 pm
by wesley_J
here is the graph after your changes looks like it helped a lot

Re: Running very rich WOT

Posted: Tue Aug 13, 2019 9:16 am
by Hondata
This should be slightly better. +3% everywhere and another +3% below 1.3V.