Wideband Issues MTX-L
 

I have a 92 1.6 N/A tuned on MS2PNP with an Innovate MTX-L wideband. I have two concerns with my setup before I move forward with my build.
First, my WB gauge and TS read different Afrs, they run about 1/2 afr difference. Now I’ve read that this issue is caused by using different grounds for the ECU and the WB unit but my WB is grounded to the back of the head, right under the fuel pressure regulator, the same spot the ECU grounds to on the 1.6. So I’m thinking about moving the ground for the WB straight to the - battery terminal but I believe the problem will still persist if I do this.
Second concern is that when calibrating my ego sensor in TunerStudio under the Tools tab>Calibrate Afr Table>ego sensor, the Innovate MTX-L option is not in the drop down menu. I’ve used the LC-1 selection because I’ve heard it’s configuration is similar to the MTX-L but I suspect that this is causing my first issue with the readings being off from the gauge to TS.
I can drive and tune the car but Im Not willing to throw on the ol Garrett until this is fixed any input would be greatly appreciated thank you and Happy New Year!!
https://cimg8.ibsrv.net/gimg/www.mia...216988418.jpeg

The manual of your wideband says "Factory Programmed Defaults: Analog Output 1 is programmed to output between 0 V for an AFR of 7.35 (gasoline) and 5.0V for an AFR of 22.39."

That should result in the following settings in tunerstudio.
https://cimg5.ibsrv.net/gimg/www.mia...8259f90a28.png

Although not directly related, you might also have to calibrate your wideband if you've not done so already - refer to the manual on how to.

When i use those controller settings my wideband reading is 1 whole afr off from TS, the closest i can get is by setting the 'point 1 volts' to .3 instead of 0 reading is still .1 or .2 off with this setting.
like i said before im using the ground directly behind the fuel pressure regulator for my wideband

Adjust settings until MS is no longer reading off. I would tend to leave 0 and 5 volts, and adjust the AFR. If you are consistently off by the same value, just adjust both points AFR by the negative of the offset.

If that is not plain, just try a few values and see how it works out. Like (0, 6.35) and (5, 21.39). Actually, those values I just listed are similar in results to some that Lars posted some time ago. His would work out to (0, 6.7) and (5, 21.7). Your ground position may be better or worse.

DNM