Suggestions for Adjusting WOT fuel?

[David A. Cooley]

Roger,
It's all going to depend on your O2 sensor as to what voltage is safe for
you...
I was talking with someone last night that had 3 different O2 sensors (new)
that all read different but within about a 100mv range of each other for
the same conditions...
Is it safe to assume that when you get lean enough to do damage the engine
will knock? if not you'll need an Exhaust temp guage.


At 09:30 AM 4/7/99 -0500, you wrote:
>
>I have been adjusting my wot fuel.  I have was removing 3% on the wot
>fuel map in the prom, as far as I can tell 3% here does not actually
>mean removing 3% fuel, but when I was doing this, I did lower the
>injector pulsewidths about .1 ms (pulsewidth about 7.5 ms range).  The
>graph of the injector pulsewidths is very clearly lower each time fuel
>is removed.  The O2's sensor readins don't appear to have changed any
>over the various runs, my 60ft times did get better each run I removed
>fuel, so I do feel I was doing something that was improving things.
>The O2's are running 860-880 range, so my guess is I have a ways to go
>to get things down.  I know the O2 are pretty crude for measuring
>fuel, but if I am targeting say 12.5:1 what is a safe O2 reading to go
>for?  I know others with my car tune for 810mv (they used a dyno), and
>others have said do worry about burning a piston until below 800mv, is
>this a pretty safe set of assumptions?  If I should mostly be safe
>above 800mv I will slowly remove fuel and attempt to use the times to
>determine if things are improved.
>
>			Roger
>			93 Z28
>

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           David Cooley N5XMT           Internet: N5XMT at bellsouth.net
     Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
       I am Pentium of Borg...division is futile...you will be approximated.
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