NTK AFX reading way off?

[greggwv]

just got new unit and NTK AFX. the reading on the NTK module seems right mid 14's or 1.0 lambda, just idle but hptuners reads is as 9.xx afr thought it might be lambda but doesn't change the same and readings don't compare


been tring to get hptuners to read it correctly but haven't gotten it right yet anyone come up with a configuration

part number was NTK 96604

[gmkillr]

You have to change the voltage settings in the scanner to match your WB, I just did this in mine.

[greggwv]

got it wasn't thinking correctly. just put the voltages in linear not list with the corresponding afr

[79 z28]

You have to change the voltage settings in the scanner to match your WB, I just did this in mine.

Is there a sticky? I have a new one as well and need to set it up properly

[umrjmac]

There is. Top of this forum..."Wideband general information and hookup" and then there is a link in that fist post called "Wideband O2's / Offset Voltages / How to"

The bit in the post where he is talking about adjusting the value slightly up or down to make it read correctly is really "adjusting the ground offset", which you should find a number of threads about if you search.

[5_Liter_Eater]

IMO thats a huge difference to be coming from ground offset. Sounds like there is a wiring problem, especially if it's not moving in HPT when it moves on the AFX.

[79 z28]

The PID is now included in 2.24 and worked fine for me.

[edge04]

I am having some issues with the reading as well and not sure what I am doing wrong. My AFR is 14.5 (its really set at 29 due to IFR scaling so can that be throwing it off???). So based off this I come up with v/8.99 + .71839. However I am reading 1.25 for lambda when calibrated and in free air.

0.62 lamda for 14.4 stoich is 8.928 AFR. This ends up being your adder. The divisor is just 5/(14.4*0.48). The 0.48 comes from the range of the AFX (.62-1.1). This makes the divisor 0.72338. So it becomes V/0.72338+8.928.

[DSteck]

Are you trying to make the analog output read in lambda?

[edge04]

Yes

[DSteck]

Use 0.62 for the adder and 10.42 for the divisor.