Hondata

While datalogging, I found my narrow o2 voltages read 3.0 volt.

I don't have wideband. Just stock narrow o2.

Narrow o2 voltage should be between 0-1v but mine reads more than 1v?

Is it okay just running like this?

Should I disable O2 heater since I'm running open loop?

Thank you.

The ECU pulls the o2 voltage to 3.8V when it is warming up. After a minute or so you can see the o2 voltage changing. For a turbo I would recommend a wideband.

Yes, get a wideband. Narrowband does not give an accurate reading for tuning. You need to see exactly what the air fuel ratio is to make accurate changes for tuning purposes.