P0101 code showing up on the start of the boost/turbo stpool

[MS32025]

Got a problem on my 2nd gen ms3, more exactly P0101 is showing up only under light throttle or when the boost starts to come up.

What i did so far as checking:

-checked for vacum/boost/exhaust leaks.

-checked the MAF conector and the wires

-tried to clean my maf with a maf cleaner spray, worked for a few tests while boosting a little then when i went WOT code showed up again
-i bought a new oem MAF since i cleaned the old one and it tried to work normaly i tought that the MAF would be be the culprit.

As mods i got bnr s3 turbo, cs exhaust manifold, oem intake mani ported and vtcs delete, cpe 3inch turbo inlet and CAI, hks ssv 4 bov, 4 bar bosch map sensor, grimspeed ebcs, cpe dp and 3inch exhaust, cs tmic, occ between intake manifold and pcv with check valve,proram
air filter.

Car feels normal on normal driving, pulls etc but the fact that P0101 and check engine indicator comes up it's frustrating.

I will also upload a WOT log and a normal driving log and a iddle log.

[mituc]

The P0101 on these cars appears in two situations:
1. when the MAF voltage exceeds 4.9V (you will find the exact limits under the Absolute Limits section of the tune);
2. when you have a choppy MAF calibration.
In your logs I can only see that your car is capable of so much more. But I can't see either of these two possible situations, even though this doesn't mean either of these actually occur in various scenarios. By example if one of the MAF wires is uncovered and shorts you will get that code. Same if in some area of the MAF calibration there's a sequence of values that do not make sense to the ECU it will freak out when it encounters them.
Other than that the MAF operation seems to be ok, the MAF calibration looks decent in the areas where it could be checked by looking at the logs only (the situations where there are a lot of sudden variations are more difficult to analyse).
If the tune you are currently running is made by you and is not intellectual properly of a tuner you paid to make this tune for you then post that as well (or send it to me privately in a direct message), maybe indeed there's something weird somewhere in the MAF cal.

[MS32025]

It looks like the culprit of my problem is the hks ssv 4 bov. Somehow it opens too early of it leaks(i'm pretty sure i can hear it opening when turbo starts to spool), throwing off MAF readins or MAF-MAP corellation.
How i got to this conclusion? I removed the vacuum line from the bov(virtually blocking off the valve), did a few quick runs barely going into boost. Basically i reproduced the condition where P0101 was triggering, and no code was showing up after this test.
Question is: can i solve this problem from maf cal or should i buy a bpv because it's actually the superior choice afterall?
I can get a GFB Mach 2 T9102 TMS from a friend, brand new.

[mituc]

Basically i reproduced the condition where P0101 was triggering, and no code was showing up after this test.
Question is: can i solve this problem from maf cal or should i buy a bpv because it's actually the superior choice afterall?
I can get a GFB Mach 2 T9102 TMS from a friend, brand new.

It's a bit weird for a BOV to behave like that. However, if you have the recirculation kit for the HKS try to switch from BOV to BPV.
You can also try with another valve, VTA or recirc - the problem that you're experiencing should not happen, these valves should not open under light boost, so I suspect your current valve may not be 100% sane.

P.S.: I checked your normal driving log in the sections where you start to accelerate and transition from vacuum to boost and the AFR and vacuum/boost variations are not significant. However, if this fixes the problem then change the BOV setup as needed.

[MS32025]

I installed a GFB Mach 2 T9102 TMS valve, i turned the adjustment fully tight then unscrewed 2 turns then i went for a drive to test it out. Under light throtle/light boost p0101 its not showing anymore but now it's showing under medium-full boost. I don't understand what can cause this problem.

Forgot to mention that new oem maf and new proram filter were changed recently. On filter manufacturer says that it has 30% more air flow. Could i be in need of a new MAF calibration?

[mituc]

Could i be in need of a new MAF calibration?

From the logs you posted it didn't look like you need a new MAF calibration. But without seeing the current MAF calibration (which I listed above as a potential cause for your issue, even mentioning how exactly it can become a problem) it's really hard to tell, and we can keep guessing.
When a filter is more permissive and can flow 30% more, manufacturers usually refer that it can flow 30% more for the same differential pressure. But the MAF readings are directly affected by the MAF housing diameter, and sometimes influenced by the air filter design but not significantly (they're actually altered a lot more by the air temperature variations under the hood when not using an air box).

[MS32025]

Problem still persists. Anyone who can actually help me solve this problem?

[mituc]

Problem still persists. Anyone who can actually help me solve this problem?

Hey!
I just replied to your private message, most likely the problem is your MAF calibration. Zeroing out the MAF calibration at the beginning is something that we know for quite a long time (12-13+ years?) these ECUs do not like (nor do the RX8 ECUs, NA 3s, and any other Mazda that I tuned or saw being tuned with versatuner and having this sort of MAF calibrations).