This topic may have already been covered, but i thought i should bring it back up. I know some will argue with me about being able to get your AFR close to what you command by using the narrowband 02 readings from hptuners, efilive, or whatever. From my experience, this is NOT true. Before installing my wideband, i was seeing roughly 890mv 02 readings on my hptuners scanner. Not knowing any better and from reading on here and other forums that you would like to see around 920mv from narrowband 02's at WOT. Using that info, i was constantly thinking i was slightly on the LEAN side, therefore trying to fix this, i was always adding fuel to my PE multiplyer. Well, after installing my wideband, i found that was NOT the case. I actually was running VERY rich at WOT, somehwere in the 10.5:1 AFR range. Even though my narrownband 02 readings where showing me slightly lean (consistantly), i was actually running VERY rich when in PE.

So, just to all you newb tuners, make sure you have a wideband or you may be going down the wrong road from the very beginning (like i was).

 

Using the narrowband 02's is pretty much the same as guessing, they're only accurate at 14.7:1...at anything other than that they are completely inaccurate !!!

 

Im more concerned with track numbers than imperical numbers. If I run a better time with a wot afr of 14:1 and I dont have KR I could give a **** about anything else.

But thats me my wot runs are very limited time wise I dont go wot for a long sprint of time and I rarely do any racing on the highway.

If I had an FI motor I would worry more about it but for those of us with low compression NA setups I dont see any big issues as long as common sense is used.

 

Like said above,the narrow bands is not accurate really at WOT,only stoich 14.7.I would get a wideband honestly.

 

I will say that MOST of us use the Narrowband to guesstimate the AFR, I'm as guilty of it as anyone but it's just not the right way....nor is it safe to do on a performance motor. A wideband IS expensive, but it's alot cheaper than replacing a rotating assembly because you popped holes in pistons from running too lean, or replacing a block because you ran too rich and washed the cylinder walls down causing scoring

 

i agree totally. If you have the money for F I, you have the money for the essential gauges.