DIY WB update

[Len Sabatine]

   I need to throw in 2c. NB, WB , what ever. NB O2s have a very narrow AFR 
window
   around stoich. Many NB O2s , even when new produce not so good readings OR
   are just Junk. Many folks don't understand the difference between Lean 
Best and
   Rich Best power. Engine fueling and Spark Timing are very interdependent 
functions.
   WB O2s will go a long distance to help separate the wheat from the chaff 
in engine
   tuning. WB O2s will never be a substitute for years of experience in 
interpreting
   the combustion status from good plug reads. There's no magic involved 
with getting
   Fuel and Spark trim right on the $ in a particular combination , other 
than hard work
   and time spent. Like it or not, Bruce is one of the few on this list 
whom really has a
   grip on these interactions. Everyone needs to focus on what works with 
their combination
   of parts, in these areas there's nothing specific , except what works 
for your setup.
   Too many folks are looking for the silver tuning bullet... There isn't one !
   Well , maybe combine WB s and Ion gap sense , would really help get the 
job done.
   Len


>Gads, I hope no one takes these AFRs, as anything other then your quessings.
>there are no universal answers for what's the sweet spot for tuning.
>
>15:1, is basically a take off on the 14.7, nonsense.  They use that for
>Emissions, and also they just AVERAGE that.  ie, toggle across that for
>keeping the converter lit.  Tuned properly you can run leaner then that at
>cruise.  The 12.5-13:1 might keep a N/A engine happy, but I know of lots of
>turbo motors that like richer then that.
>
>If you plug the WBs in place of the stock ones, you'll need an interface so
>the stock ecm can recognize them.  Please note, this is the Gmecm list, and
>we're in general talking about gm applications.
>Bruce
>
>
>
>From: "John Lamb" <jll at edge.net>
>Subject: Re: DIY WB update
>
>
> > If you want any meaningful comparison data between your stock O2's you
> > will need to mount as near as possible to them.
> > It would be nice to run a WB as a monitor on each side near stock O2's
> > to use for tuning for open loop operation.  Tune with the WB and set
> > economy for 15/1 and WOT 12.5-13.  Use the WB's to watch for changes
> > over time. If you were interested in this approach, you could just plug
> > them in place of your stock ones.
>
>
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