A/F Ratio Guage Questions

[Magus2727]

Not completely worthless... its like having a dummy oil pressure light that only lights up if to high it low vs having an actual swept gauge. Just depends on the level of information you want. Since a wide band is not all that much more than a narrow band it would be pointless to buy a narrow band, but not if it was give to you or was dirt cheap.

[1turbofocus]

Correct Narrow brands are pointless for anything but a flashing light , they will give you no useable information at all

To say you don't want a tune because you want to "go legit" but your CAI and your exhaust unless you have CARB stickers for them would make you non carb legal

The best thing you can do is a tune this way you can read your voltage , rpm , and hundreds of other things you haven't thought about , also add a wide band air fuel and bring all your mods together for the performance you added them for

There is no way for any state to know through any inspection that you have anything but a stock tune in your car , They cannot see you added a tune, Ford Dealer cannot even tell if you gave them your ECU

Tom

[mikebontoft]

Guess I won't say anything else about the narrowband.

wideband is nice because you can just replace the front 02 with the wideband and it has an option to output as the stock sensor while also displaying your afr.

[1turbofocus]

I would do the front o2 and the wideband as dedicated units not connecting the 2

The front o2 sensor under WOT will show the commanded WOT base fuel which conflicks with what the actual air fuel is

This is why a narrow band is worthless because the air fuel is shows under wide open throttle is the commanded air fuel in the base fuel table in the tune even stock NOT what the actual air fuel is

Tom

[Andrews-bad-SE]

My exhaust and CAI are "49 state" legal. For MO (where i am) and OH (where im moving), theyre acceptable. I just want to avoid having to cheat the emissions testing. It's my daily, but i still would like to do a few cool things to it and stay straight-up legal (at least until i make a few new friends at my new job ;) ) lol. Thanks for all your help guys, A/F ratio monitoring is something im not very familiar with at all. The input is very appreciated!