Would like to know what does the mean rich/lean O2 votage vs air flow manage? May be an stupid question but really need to undestand what does this parameter do.

Regards
Ray

 

Up in the Sticky's, Tuning Guide Book link, Chapter 5, '8746/'7747/'8063 section, Fueling Logic.

RBob.

 

Thanks RBob fro the link, very goofd reading.

But have a quetion here. How may I start tune VE tables aming for 128 if I really do not know where my NBO2 swinging point is v.s. WBO2? I mean, how may I adjust mean point to match WBO2? Is it trial and error? I have not a way to datalog with WBO2?

Regards
Ray

 

I'm not quite sure what you are asking. The O2 swing points are in the calibration, can just look at them via an editor. As for matching the NB sensor to the WB sensor, shouldn't need to. They both measure stoich as stoich.

What it sounds like you want to do is to use the BLM value(s) to adjust the VE table(s). This is during closed loop/learn operation.

Then during WOT where the ECM goes open loop use the WB value to adjust the VE table(s). Just be careful of a BLM above 128 during this time as the ECM will use it in PE mode.

RBob.

 

Ok, now I undertand that.

But point again is why if my NBO2 and WBO2 reports diferent AFR? Like in long tube headers for instance.

 

A NB sensor doesn't report an AFR. It switches high/low at stoich with some slope to the output.

RBob.

 

Now that is succinctly quotable thanks.

 

Your NB feedback to ECU is attempting to keep engine at stoich. That stoich value is commanded in .bin. I presume it is 14.7/1. WB is reporting the actual A/F. Stoich being 1.00 Lambda. My WB is set to show A/F or 14.7/1 as Lambda. I tend to cruise at 15.0/1 yet I am commanded at 14.3 in bin. Not sure why that happens.