I'm curious as to what exactly the advantages are of running a wide band afr setup as opposed to a narrow band. The only thing I can think is the ability to data log with the wide band, but aside from that, what are the main advantages?

 

the stock 02s are narrowband and only accurate at lambda=1
widebands are accurate over a range like lambda=0.7 to 1.2

 

So pretty much you just get a wider, and probably more accurate, range of measure.

 

Accurate in the sense that a wideband can actually get a correct reading... Precision is lower with a wideband, but it is a wider range. Narrowband O2s are very precise.

 

Think of narrowbands like a switch; they are either on or off. In the case of the narrowbands on your truck they read high or low, very accurately, at only 1 point. Now with a wideband think of it like a gauge, you are now able to see quantitatively how far away from lambda=1 (Stoich,ie, where your narrowbands are useful) you are. This is a very big deal since if you are for instance running a turbo you want close to 11:1 afr. If you only have a narrowband, it would show the same reading for 14:1 as it would for 9:1, so you really have no idea what the actually amount is other than you know its "rich".

 

Gotcha. That actually makes far more sense than I thought it would. Thanks guys!

 

Awesome explanation Atomic!

 

all i know is when i see 11's and 12's im havin fun but when i saw 17s on the old motor i was pretty bummed lol