[Diy_efi] tuning question

[Tim Marsteiner]

I built the DIY WBO2. Any idea of it's accuracy?

I have not done any ignition optimization yet and it
is set pretty conservative.

I would say that less than optimim ignition will cause
the O2 reading to be high? And are you suggesting that
it will also cause more variation?

I will see if the variation is particular to any area
of the map and see if bumping up ignition helps lower
variation.

Also, since I have individual maps for both cylinders
I was trying to get it to run LOP at cruise. I set the
A/F to 15.6:1. At lower loads I was getting some
surging, but I had not changed the timing. I will try
adding more advance here to see if the surging is
reduced? 

Thanks,
Tim


--- Michael Richards <michael at fastmail.ca> wrote:
> Some of your results will depend upon the accuracy
> of your WBO2. On my 
> Techedge I typically see within 0.1-0.2 points of
> repeatability given a 
> specific load site and provided that all the
> corrections are working 
> properly. If you don't have an accurate IAT signal
> or CLT for example 
> it could account for the variation you see. Also be
> aware that ignition 
> advance will have an effect on the measured AFR.
> 
> -Michael
> 
> > Is +/- 5% variation within the realm of acceptable
> for
> > a engine of this type?
> > 
> > I have heard that the wideband O2(NTK) reading can
> be
> > made more accurrate by correcting for EGT. Does
> anyone
> > have an idea of what AFR correction I might apply
> > based on EGT?
> > 
> > 
> > Thanks,
> > Tim
> > 
> > 
> > 		
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