Erratic AFR with Learning active?

[1320king]

The MAP sensor came with the intake manifold already installed.
I selected the MAP sensor in the drop down menu in the Holley software.
And yes, MAP Y axis is still 0-285 kPa.

[Danny Cabral]

The MAP sensor came with the intake manifold already installed.

Replace it with a 1 bar MAP sensor, and select a 1 bar MAP sensor in the EFI software.

I selected the MAP sensor in the drop down menu in the Holley software.

I know...I didn't ask you this.

And yes, MAP Y axis is still 0-285 kPa.

Well, there's your problem! The MAP kPa scale was changed to 3 bar, but the Base Fuel Table still has 1 bar values.

Remember, the base calibration you start with, must correspond to the MAP sensor you're using:
For example, you can't use a naturally aspirated base calibration for a forced induction engine.
This is because the 2,3,5 bar MAP sensor selection only changes the kPa load Y-axis, but not the Base Fuel Table lb/hr
values (creating an excessively lean map) or the Base Timing Table degree values (excessively advanced timing map).
You must choose a 2,3,5 bar base calibration or reconfigure your existing Global Folder's Fuel & Timing Tables accordingly.

[1320king]

Any way I can keep the sensor on it, and adjust it accordingly?
Or start with the LSx turbo base calibration, and adjust that accordingly?

[Danny Cabral]

Any way I can keep the sensor on it, and adjust it accordingly?
Or start with the LSx turbo base calibration, and adjust that accordingly?

No, don't use a forced induction base calibration for a naturally aspirated engine. That's a significant waste of Base Fuel Table resolution.

[1320king]

Well, what can I do, so I can use the 3 bar MAP sensor with current setup?

[Danny Cabral]

Well, what can I do, so I can use the 3 bar MAP sensor with current setup?

In the meantime, while you wait for a 1 bar MAP sensor? (Like the engine is supposed to have.)

[1320king]

Yes, nobody has one near me. I have to order it.

[Danny Cabral]

Yes, nobody has one near me. I have to order it.

1 bar MAP Sensor - Standard Motor Products AS17 (TBI & MPFI), AS60 (Terminator & LSx)
https://www.holley.com/products/fuel.../parts/554-120 (Holley EFI 1 bar MAP Sensor)
https://www.holley.com/products/fuel...s/parts/538-24 (Holley EFI 1 bar MAP Sensor)

[silverbullet9]

Danny, can't he keep the 3-bar MAP sensor and just re-scale the Y-axis to go from 0-100 kPa, using the values from the 480HP LS2 tune as a starting point? I'm assuming the 3-bar sensor will still take accurate measurements from 0-100 kPa, correct? He just won't be utilizing the 2-3 bar portion of the MAP sensor. Mike

[1320king]

If that works, I would love to do that.