Correct A:F Ratio @ WOT?

[Bruce]

From: "Stephen Webb" <swebb at netlab.uky.edu>
Subject: Re: Correct A:F Ratio @ WOT?
> > You never,
> > ever,
> > tune to an AFR.
> > You tune for performance and note trends, or validate corrections made
with
> > a WB.   In tuning you let the engine tell you what it wants, you never
try
> > to force it to run where you **THINK** it should be.
> > A WB is just one more tool in your box, it, in and of it's self is
nothing.
> So that sort of sucks.

No that's the way life is.  Tuning is not dropping a few parts in an engine
and hitting the key.  It's testing to see what works in your combination.

> How often, on an optimally tuned engine, does the A/F ratio deviate
> significantly from the "slightly rich" range?  Or, perhaps, how often
> does the A/F ratio (on an optimally tuned engine) run lean?

You can't write rules in stone about what will work in all engines, they
vary.

> Is the AFR really that poor of a way to tune?  If one has no other tools
> in your box to tune with, can you do anything worthwhile with a WB sensor?

If you have no other tools, then your not even tuning.
You first and formost need a way to measure performance.
You need a basic understanding of reading plugs.

Then you can move up to data logging, WB Os, EGTs, and other AIDS.  Tuning
takes time.  Lots of folks just seem to think it's a 1-2-3 and your done
thing, ain't that way.

WBs, and your other tuning aids just get your tune up right, faster.  That
also means less wear and tear to get things right, Once your clear on what
your doing.
Bruce
>
> -Steve
>
>
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