Forced Induction and MAF readings, as well as Fuel Trim?

[brzperson]

Hello everyone.
I just bought a turbo BRZ, with a SBD kit on it.
Freaking stoked!
I understand why people love these cars so much.
I feel like I'm driving a shifter kart around town, and I just love being in the car.
Even in normal, everyday situations in low rev ranges.
There's really nothing quite like it.

It's been running DD on the kit for 70k+ miles, and nothing about it seems like it will not continue doing so.

However, there are some things that are a bit concerning to me.

The STFT and LTFT are somethings really high (in the positive direction), but never throw a code.
This tells me that the car is lean, but if it really was, wouldn't my AFR be off?
My AFR is always good. around 1 stoich +/- .004
.085 under boost, and 1.3 when throttle cuts off.

TLDR SCROLL

I compared engine vacuum to maf readings by using a fancy thing I found here on stack exchange: https://mechanics.stackexchange.com/...af-calibration

Essentially, I ended up with a MAP reading of 32kpa.
After converting to engine vacuum (opposite of MAP-baro), I get about
20.37hg in vacuum.

Since my car idles at 892 RPM, I converted that to sucking in 14.86 LItres a second.
Finally, 0.9868 (sea level baro) - 0.682 atmospheres (20.37hg converted to atm), I get what should be a MAF reading of 4.56 g/s.

However, my maf is reporting 2.34 g/s.

TLDR
My fuel trims are wonky (+ double digit percentages LTFT), and my maf is reporting half of what it should as g/s airflow.

BUT my car runs perfectly fine, and my AFR is on point.

The car is boosted and tuned.

I have heard that on boosted cars, maf readings essentially go out the window unless they are specifically tuned for.

Should I not worry about it, and just trust the AFR readings, or could the engine be compensating for a very lean condition, while still keeping a good AFR?

Again, there's NOTHING wrong with the way the car runs now.
It has a ton of power, has been running for at least 66 hours with no code, etc.

BUT if something is wonky, maybe i should look into it now.

The way to know for sure is to just get a smoke machine, which are pretty cheap, or go to a place that can smoke machine for me.
But I'm really just trying to wrap my head around all of this first, before I do something like that.

Though if I own a car that has introduced many more intake pipes, I might get one just in case I need to know if I ver need to replace a pipe clamp or something else.

[tomm.brz]

the afr is good because the trims (stft and ltft) are trying to take care of it
Probably you also have the closed loop fuel control active during open loop if it s ecutek tuned

the trims are high probably because the maf scaling is not scaled properly.. Some tuners don't even try to have a perfect maf scaling, but they use a fixed one because they get predictable cells-choosing on the tune tables , or they have a speed density strategy, or they just don't care and let the ecu do most of the work

Difficult to say without a log from your car posted in here

[brzperson]

Originally Posted by tomm.brz

the afr is good because the trims (stft and ltft) are trying to take care of it
Probably you also have the closed loop fuel control active during open loop if it s ecutek tuned

the trims are high probably because the maf scaling is not scaled properly.. Some tuners don't even try to have a perfect maf scaling, but they use a fixed one because they get predictable cells-choosing on the tune tables , or they have a speed density strategy, or they just don't care and let the ecu do most of the work

Difficult to say without a log from your car posted in here

Thank you!
I just figured out how to log, and I finally got some.
It looks normal to me, but I'm hoping that someone with more experience might be able to read them better.

I noticed some timing being pulled in 2 squares on my city mile drive, but I heard that subarus do that once in a while.
The speed looked REALLY off to me at first, but then I realized that it was recording in km.

Would you happen to be able to know if there is anything wonky in there?
Thanks again!

Links to Logs:
https://ufile.io/waixrmqm

[tomm.brz]

no, Please upload the log into datazap.me and then link it here..

[brzperson]

Originally Posted by tomm.brz

no, Please upload the log into datazap.me and then link it here..

Ok, thank you!
https://datazap.me/u/drivingwithme/l...4?log=0&data=9