Running a little rich
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TECH Fanatic
Joined: Aug 2003
Posts: 1,768
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From: Lexington, NC
Running a little rich Hey guys, last night me and my bud ran a predator on my car and @ WOT the left 02 read a high of 930 and the right one read a high of 950, my ? is, how much if any do I need to lean it out and will I see any power gain from doing this. Also Im getting 0 knock retard. Thanks guys
WeS
WeS
That's a tad chubby. Back off the PE setting
a percent at a time until you get to maybe
890mV (which is still rich, but safe) or
start to pick up KR. If you get down to
890-900mV and still have no KR then you
can push timing up.
a percent at a time until you get to maybe
890mV (which is still rich, but safe) or
start to pick up KR. If you get down to
890-900mV and still have no KR then you
can push timing up.
i have mine running good at about 890-900 mV but its not real accurate thats the problem. i would mess with it to get it to hover around 900mV and if u have no KR then check WOT spark, u can get that up to about 30 or so. mine is about 30.4* and my o2's are 905 and it feels great. what are your ltrims at part throttle?
930 mv might be 13.0:1 ratio! (it is in my car) You don't want to lean it out in that case. Or 890 mv might be 13:1, or that might be 12.7. The only thing that is certain is 450 mv is 14.7. See what I mean? Your O2's are not accurate for PE adjustment. IMO, don't mess with it until you get a wideband on there.
Last edited by Cal; Nov 10, 2003 at 11:17 PM.
Also it matters on which gear you are in when getting the readings.On my Atap I like .940 in first,.920 in second and .900 in third with no knock.That ='s 12.7-1 on the dyno.Not all scanners are the same,so my #'s might not be the same A/F as yours.
