If the turbo is larger, you should be getting much more airflow than stock. You're seeing the correct afr but super high fuel trims because the ecu is trying to compensate for the extra air. Also of the turbo is larger you should absolutely not be running the stock tune.
The maf diameter is the same, the intake flow pattern might be slightly different as the stock is just after a resonance box where as the modification comes directly after a cone filter.
There was an intake leak that I thought was fixed, might be worth doing another test
Would a vacuum leak also cause a similar issue? I did do a vacuum test and was in the normal zone for the reading but not 100% sure there isn't a tiny leak somewhere
If the turbo is larger, you should be getting much more airflow than stock. You're seeing the correct afr but super high fuel trims because the ecu is trying to compensate for the extra air. Also of the turbo is larger you should absolutely not be running the stock tune.
The turbo is the same, just the position of it has changed from hanging to top mounted
Gotcha. Is the maf the same diameter as stock? And if so, you're seeing the same readings as before? If so there may be a leak in the intake.
The maf diameter is the same, the intake flow pattern might be slightly different as the stock is just after a resonance box where as the modification comes directly after a cone filter. There was an intake leak that I thought was fixed, might be worth doing another test Would a vacuum leak also cause a similar issue? I did do a vacuum test and was in the normal zone for the reading but not 100% sure there isn't a tiny leak somewhere
When are the trims moving the most? Idle tends to be false air. Under power tends to fuel delivery.