Ok, so the logs you posted with idling look relatively fine. However after looking at the tune I have to admit that this is by far the worst ever MAF calibration I have ever seen, ever. Worst-MAF-CAL-ever-20251005.png By comparison this is how it should look like: SomeRandom-MafCal-20251005.png You ...

Any recent logs after all this work was done?

Post logs. Exhaust popping at idle during cold starts and even at warm idle is normal to a degree, if you will look at the live data you will see that timing has a variation when it happens and has to do with the timing adjustments the ECU makes to maintain the idle RPM, and it is indeed more accent...

In the log without air filter (mentioning "no air filter" just for reference with no direct connection to what I think it happens) the symptoms are of a boost leak. Let's look at the 6000rpm mark: - with air filter: 322g/s of air at 20PSI of boost and 119F BAT, AFRs on target; - without th...

I have now tested some more. Boost is the "same" using 0 or 100% BCS DC. The Valve does work. If the EBCS works then most likely whoever refurbished your turbo did not put something properly on the wastegate side. Wonder if pressure is only regulated be the wastegate opening by exhaust pr...

0% WGDC means that the boost from the source will go directly without any alteration to the wastegate actuator. In bleed mode (2-port) this means the EBCS is fully closed, so no boost will be bled from the wastegate actuator (2nd barb) via the EBCS to the intake, and all of it will hit the wastegate...

0421 is absolutely normal with aftermarket high-flow cats. There is no fueling issue (you'd have codes for exactly that if it was the case) or any other issue. You have two options:
1. weld a spacer bung for your secondary O2 sensor;
2. disable the P0421 from versatuner when you flash the tune.

CrazyCanadian wrote: ↑September 20th, 2025, 1:26 am Unlike that world, we don't have access to injector data in order to make the kind of changes needed to rescale a table the way the domestic world does.

I'm talking 100% versatuner context.

If you have a 3" intake then you need to have a tune with the right MAF calibration, otherwise the symptoms are exactly what you're experiencing. It's not a MAF problem, seems like a calibration problem.

While we're on the subject does anyone have any experience with AUX fuel tuning with VersaTune? Everything that I've seen corresponds to doing so using Cobb (AccessTuner) (i.e., boost tuning). You can do boost or load tuning on both Cobb and Versa (as well as with Mazdaedit, Ecutek, WinOLS and what...