Just wondering if this is normall. Currently have blm readings in the 125 to 130 range and the int is about the same. My wideband LCI is installed in the y-pipe just back from where both banks meet. The OE narrow band is in the shorty header just before the collector-Pretty much stock location. Now most of the time my wideband readings are from 14.2 to about 14.9. and generally fluctuate between 14. to 14.5. Is this normall. Wot is set at 12.3 at low rpm to 12.6 at above 2800 and this seems to be pretty close to that as well. Ocassonally it will go to 13.2 for a spit second under wot. Now Im just wondering if this is normall for the wb to be slighly richer than the stock O2??? Thanks for any response I know there is alot of depate on this. Thanks!!

 

generally speaking, 12s are high for WOT, should be more like mid to low 11s and just being on the safe side high 10s.

 

I beg to differ with you!! 12.2 to 12.8 should be plenty rich for Wot. I have heard that some will also risk running 13+ afr at wot. All depending on what the motor wants. What I am really wondering is if the wb swing points are respectable in compared to my nb/blm readings?? thanks.

 

Eh, maybe its different between 4 bangers and v8s. Or maybe my wideband was really a piece of junk but my car wasn't ever really happy till it was in the 11s.

 

Quote: 14.2 to about 14.9. and generally fluctuate between 14. to 14.5.

My A/F is commanded to 14.3. rich/mean /meadian are about 10% higher that stock . No HW mode. DE disabled . No EGR no CCP. I see 15.0/1 at steady cruise little load 65 mph. WB is further back(16 inches) in ext stream than NB. WB sensor is newer. freshly calibrated. i trust the WB to accurrate. at higher rpms with little to moderate load i am 14.3 or so. a/f does fluctuate some which I think is normal. Lean spikes with a good TPS movement I believe can be expected. when the TB opens up i dont think the spike can be avoided. Hopefull it is short in duration and does not cause a dicernable cough. Cold intake does not help.

 

in these days of 4$a gal gas. i like to run 12.9 at peak TQ and 13.1 at peak hp, and leave the timing low so it doesn't rattle. for a normal comp street car. boost would be different.

overall i think it makes 95% of the power, uses less gas and is happier. but i read that somewhere, then tried it and it could just be my motor that it worked well on.

 

Ok thanks for the reply Ronny!! So some basic swing of the wb is normall operation and It would seem that my tune is in a good state then. Just wanted to confirm my thoughts with everyone else.

 

I believe the WB is very accurrate and sensitive. the A/F does move around a bit. i guess one needs to look at long term averages. the innovative program has the ability to smoothen the graphs. if not done it is apparent they are in flux. I ran EGT gauges a ferw years back and they too would move around the sweet spot.

 

I would say that you are right on the money for a closed loop solid state cruise AFR. I think the slight swing you are seeing is the cross counting of the stock o2 sensor.
Also your WB is way more accurate than your NB. Your NB is probably not crossing at exactly 14.7 anyway.

 

Ok thanks again guys. Now for another question! Is there a way to log the LC-1 in a datalog without using it for the ecm fueling. Im still using the 7747 $42 mask and winaldl/tunerpro or tunerprort. It would be nice to see the WBdata vs rpm or map. I think I need to get another addition to the LC-1 for this-rpm converter or something cant remember. So seeing the WB swing a little in the 14 ish range should normall??. My long term blm-wide average10 numbers are all around 125 to 130. Thanks guys any other thoughts would be great.