Im talking wot here,not closed loop.The ecu does not use fuel trims for wot,only closed loop operation.

 

Thank you slows2k!!!!Thats the answer i was looking for!!!!So i can assume that my af ratio on the dyno will be about the same on the street.

 

Pretty much. Operating conditions do vary, so the #'s won't always be exact. Keep it in the 12.0-12.5 range and it will be fine AF wise. Outside temp, and altitude can also effect the #'s as well.

 

Just taking a second look at my dyno sheet,the leanest i see it go is about 12.6 from 7.7k-8.5k,that reading was taken after the cat so it most likely a few tenths richer.Im being VERY cautious!

 

I wouldn't stress over the .1 If it was in the 13.0's I'd have a problem driving in for any length of time at WOT.

 

The idea of using a wideband in place of the narrow band has been discussed in threads recently. Widebands like the PLX, AEM and Techedge have an additional 0-1V output so as to simulate the narrowband signal. You should be able to connect this to your OEM ECU and function normally. The only requirement is that you put a load resistor on the OEM O2 sensors heater circuit so the ECU thinks the narrowband O2 sensor is still there. Otherwise it will throw a CEL.

 

AUS,

Do you know if the simulated output from these is as accurate as the standard one? I want to use a wideband without tapping a new fitting.

MB

 

I highly suspect it is more so. The stock sensor is more of a flip flop from lean to rich.

 

Why should a load resistor be used if these widebands have the capability to simulate 0-1V narrowband outputs

 

Because the stock ECU expects to see a load on the heater circuit and throws a CEL if it doesn't.