Thread: Good afr?

I just got a wideband and got it hooked up and I'm showing an afr of 10.5-10.8. That means i'm running rich right? I thought a good afr was around 11.2 or so but i really don't know. Mods in sig. Thanks.

You are correct, that is if your engine can handle running leaner.

Canned tunes tend to run rich.

Cruising I'm around 14.5-15 ish. Would i be able to lean that out for better gas mileage?

Originally Posted by Fivefingerdeathpunch

Canned tunes tend to run rich.

IIRC you prefer the lowest of AFRs, yes?

Originally Posted by dsmuts

Cruising I'm around 14.5-15 ish. Would i be able to lean that out for better gas mileage?

Its an age-old question. Search for "lean burn".

The lower the better.

If I had an exhaust leak would that make me read leaner?

Originally Posted by dsmuts

I just got a wideband and got it hooked up and I'm showing an afr of 10.5-10.8. That means i'm running rich right? I thought a good afr was around 11.2 or so but i really don't know. Mods in sig. Thanks.

yep rich

What about if i have an exhaust leak? Would it read leaner than it was?

depends where your wb02 is

In the rear o2 spot on sd's I think I have a leak somewhere though. Good possiblity its the flex.

most likely yes.

So i could be running even richer? That sucks.

possible.

To me thats way to far back. I have mine in the goose neck on the sd headers.

Does it throw it that far off having it further back? Maybe I should weld an o2 bung on the crossover and put my o2 there and put my wb where the o2 goes?

Originally Posted by dsmuts

Does it throw it that far off having it further back? Maybe I should weld an o2 bung on the crossover and put my o2 there and put my wb where the o2 goes?

nbo2 from one bank of cylinders, smart.

Dont some of the headers have the o2 in the crossover?

Yeah, having the narrow band in the cross over is fine, as long as you are not tuning off it. Wbstore and zzp both do it, and I have modded some speed daddies to have it like that seams to work fine.

Originally Posted by TheOtherNick

Yeah, having the narrow band in the cross over is fine, as long as you are not tuning off it. Wbstore and zzp both do it, and I have modded some speed daddies to have it like that seams to work fine.

Just doesn't seem super smart to me. -- Unless you have a wideband operating full time at least, even then i think it hampers the car's ability to self correct fueling. Ideal would be to have b1s1 and b2s1 but GM was too cheap for that.