12sec.5.3

iTrader: (1)

At wot my wideband is reading 12.4-12.6 but my 02's are in the 700-800's. I know the narrowbands don't matter much but it doesn't make sense to me.

chrisj6

Yeah I never trusted the narrowbands. I even have them deleted from my scanner config to free up more space!

1SlowHoe

iTrader: (28)

Free air calibrate your WB. Mine was giving me really bad info until I re-did the free air cal.

Mort

I think that the narrow band O2s are only meant to be accurate at an A/F ratio of 14.7 and to adjust fuel for transitions around that range. My WBO2 reads a very steady 14.6 at almost all driving conditions except WOT and my commanded AFR is always 14.6 except at WOT.

At WOT my NBO2 read from 900 and down to 850 during a 0 - 100 mph dig. After I put the WBO2 in I found I was running an A/F ratio of 12.5 at 10 psi without meth and an A/F ratio of 10.5 with meth. The NBO2 readings did not vary more then 20mv between the two runs. I have seen 920mv but my guess is that the AFR must have been around 10.0 at that reading.

The NBO2 always seem to give fairly consistent readings from run to run but it is pretty hard to translate those readings into an AFR without the use of a WBO2 to back it up.

dewmanshu

iTrader: (4)

sounds right to me. The higher the mvolt the richer the combination.

This is a great comparison reason for why you(read as "others") shouldn't tune WOT with nbo2's. 850 to 900 for me is around 12.0 to 12.2 plus if you'll notice by your scan, in the beginning of 2nd gear your(okay okay, mine) WB says 11.9 and NB's say 900, but then at the top of third gear your(arghhh mine) WB says 11.8 but now your NB's says 870. Ofcourse #'s are different for other people, just pointing out that your NB's get more and more inaccurate as your run continues. They are a "fair" gauge.

12sec.5.3

iTrader: (1)

So do I just unscrew the sensor for a free air cal.?

Wheatley

iTrader: (12)

Yes,inscrew it and let it sit out of the pipe and do a free air cali.
The narrow bands are not accurate except for stoich 14.7 though though,now that you have a wideband do not go with the narrowbands