RomRaider

Could there be an issue with the def file or the program on the latest release? I currently use STi pinks and have played with the scaling all night from values ranging 528 all the way to 590 and even 650 - the AF Learning #1, after warm-up, dips down to -15.63%

Do you have an intake? What ecu revision are you using?

yes, i'm using a K&N ram intake. ECU rev A4TC400L

You should be logging only after the engine has reached full operating temperature. I would recommend, if you have it laying around, putting the stock intake back on and try tuning from there. Then if you can get it tuned with the stock intake correctly, put the other one back on and see what happens - from there you might need to adjust your MAF scaling.

that's what I plan on doing today... i'll post later on.

The thing I don't understand is why the injector scaling has no effect on the AF learning. Eveything else aside, there should be some difference after making the injector scaling bigger.

Mike

I installed the stock intake yesterday and start working on the injector scale. i noticed that using 0.3.2 release is showing higher values than 0.3.1b - 590 vs 523

I end up using 0.3.1b to change the values and finally got the AF learning to -5.xx at idle. The value is 620, which in 0.3.2 is probably over 700+

After driving for a while, the ecu throw a CEL indicating lean conditions on bank one. So I dropped it back down to 580.

I'm not sure what's going on.

The formula to change the injector scaling occured in one of the definitions but this has nothing to do with how the ecu uses this value, only how it is displayed to you. The newer formula should get you closer to where you would need to be. Regardless of which formula you use, you still have to tune it further.

You might have an additional issue with you car - bad o2 sensor, intake leak?

...or a 2.5l block

i can rule out intake leak. i'm not sure if the o2 sensor is bad or not. closed loop seem to target proper a/f ratios tho.

When O2 sensors fail, they generally fail on the safer side of things. They read too lean, so the car adds more fuel to compensate. Your car seems to be reading too rich, so I am not sure if it is an O2 problem.

As far as leaks go, when you are at idle, you are under vacuum, so if there was a leak, I'd suspect it would draw additional air in and lean things out, not richen it up.

Is the MAF clean? Sometimes oiled filters leave a coating on the MAF.

Good points. If the MAF was dirty, wouldn't this also result in a lean condition?

i'll need to start looking for a replacement o2 sensor then.

the MAF is clean, I actually cleaned it again whenever I installed the OE box back.

Good points. If the MAF was dirty, wouldn't this also result in a lean condition?[/quote]

you're right....dyslexia FTL

i confused myself there....

i finally found the problem.

the MAF scale values are way off. it's been modified. I looked at an old map and compared the values with the MAP values I was using and the one I was using is higher than the stock ones. I replaced the values with the stock values (since I'm using the stock airbox) - I also changed the Injector scale to my old value (552.02) and viola!! AF learning is down to -3.xx% to 4.xx%

for the longest time, i have also been running the rear o2 sensor with CEL fix. i got rid of that as well.

partial throttle is not so rich anymore either. open throttle hits 11.1:1 tapers down to 10.5:1 - the AF ratio is bit whacky, but that can be polished.

the only consequence is that, somehow, I have a short boost spike - again. but i can fix that tomorrow...

for now, I'm just glad that things are working better.

check out this log.