Commanding 11 afr and getting 11.7?

That doesn't make sense. You should be able to do 100 revisions and it should never get worse. You said that making changes does nothing so how does it get too far off after 6 revisions?

 

The maf curve gets way off in the spots I keep adjusting.

 

This might come off a bit stupid but are you sure you're adjusting in the right direction?

Also, have you changed ALL of your fueling tables for the corresponding loads? The ECU might be looking up a table that you don't think it's using at that time, happens a lot. Make sure all of your WOT tables (knock and BAT tables are all right) also be sure to adjust the upper load portions of your CL table as well.

 

Also check your CL Max Load tables. Those can cause some wonky behavior when over 2.5 load (I didn't look at log).

 

He's barely over 2.0. And the logged MafV/gs seem to be consistent with a stock sized MAF. More specifically with Cobbs MAF scale. Also seem to tend pretty close to his 2007 MS3 log, which I assume to be stock sized MAF.

@mazdas4me I hate to ask the dumb question, but you did copy the values into both MAF tables?

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[doublepost=1492189338][/doublepost]Have you checked your exhaust? prior to O2 sensor? possibly a leak?

 

Here is my copy of my ATR, e17 map, and corresponding data log for anyone wanting to open it and take a look.

Just unzip, and open the program file, no need to install. It runs independent.

DO NOT update ATR or it will not open file. I am on the pre ban version of ATR.
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Download my ATR and take a look at my fuel tables and let me know if you see anything wrong.
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Yes, copied to maf cal b as well. No exhaust leaks.

 

1st e30 log using same maf cal and commanded afr as the e15 log. Only diff is load adjusting, Timing, and e30. Looks about the same wot afr as previous. Apparently at least this way of doing it works and is consistent. Not bad power so far...

 

Just a guess but I'd say it's possible you're accumulating an excess of e85 in your tank. Run pump gas for a few tanks then begin again, fresh. Are you mixing the exact ratio every time you get gas?

 

I have a mix calculator so I don't get too much or too little e85.

 

Have you tested it for ethanol content?

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Yes, 5% ethanol in my 91, and 80% ethanol in the e85

 

BPV or BOV?

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OEM Bypass or recirc valve

 

I remember having an AFR issue dealing with my BPV but for the life of me I can't recall what it was LOL.

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I have 2 Speeds, so I have swapped a few things to verify they are good, and the recirc valve was one I swapped with no change. My 09 hits commanded afr almost right on. This 07 is strange. I have a workaround that works great and consistent, but just kinda driving me crazy as to why it won't hit commanded afr.

 

Call me crazy, but I do my WOT MAF Cal right after a new flash so there is no trimming going on.

Also, I do my calibration backwards. Instead of going thru the log line by line and plugging values in the sensor calibration, I look at the voltage value I want to change and find it in the log. If it falls between 2 logged points, I interpolate the correction, then apply it to the table. Seems to be a much quicker method for me.

 

I didn't read through the whole thread, so forgive me if this has already addressed, but have you already ruled out mechanical issues, such as boost leaks?

 

Yes, triple checked everything. Not worrying about it anymore. I just command richer to get what I need. Strange, but it works. Very repeatable afr every log. Still would like to know why, but not really concerned about it anymore. Making good power for mods I have.

 

That's a band-aid, man. I highly recommend getting to the bottom of it. Commanding higher or lower than you really want, AFR-wise, and relying on some unknown issue to correct it is just asking for trouble. I say this having done a lot of tuning and having seen the havoc that AFR issues can wreak on turbo cars. Catastrophic stuff.

 

Bandaid or not, it works flawless and I am done trying to figure it out. This is what it wants to run the afr I want, so we are both happy.