o2 readings and timing

[twobit]

Finally got my ltrims locked in at 0 at wot. However my o2 readings are .945-.975 at wot. How much fuel do I need to pull in order to get this down to .900 or so?
Also, what tables in high octane start wot? thx

[ONE04FX4]

cool mine will actually go to 1015 every once in a while. this is a good thing. just means they are doing there job.

[Hay Hauler]

You can start pulling fuel out 1% at a time and then scan it. It's better to get your AF tuned with a wideband. If you have a scanner, log a run at WOT. Look at the timing at a certain RPM then look for that number in your HOtable. With my scanner it is very easy to graph timing and RPM's together. Add timing until you get a little knock then back it out. That is the way that I do it, and it has worked so far. I am running 30* with no knock.

[Bandit]

Normal O2 switching occurs between 200 and 800 millivolts, with 450mv being the switch point. During normal running conditions, is is not unusual to see voltage as low as 100 mv and as high as 900mv. During WOT, voltage should immediately go to AT LEAST 900mv, and may reach 1 volt or a little higher. Going over about 1.2v can sometimes cause problems, as there might not be a strategy for voltage that high, so the computer reasons that since voltage is not between 450 and 1.2 millivolts, the system must not be rich, so it has to be lean. That can cause all sorts of problems!



Bandit!

[farmtruc]

That's a little high at wot. .900 seems to be a safe number, shoot for 870-890.
If you have cot enabled, you'll have a tuff time tuning for wot a/f ratio.

later,

allen

[twobit]

What does disabling COT do? Can I do that without any other changes? Its currently set at true.

[twobit]

Used the ole search feature and found the answer I was looking for. thx