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2011-2014 Mustangs
Engine/Tuning
AEM Air/fuel gauge reading high?
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<blockquote data-quote="Shaun@AED" data-source="post: 14166459" data-attributes="member: 32381"><p>This is why learning to read Lambda makes things so much easier.</p><p>Factory strategy always targets 1.0 Lambda (unless at WOT, or decel, etc), the programming determines what the Air Fuel ratio is by multiplying the Lambda by the programmed stoich.</p><p>For New Factory Fords, that's 1.0 Lambda * 14.08 Programmed.</p><p>For All aftermarket Air Fuel gauges that's 1.0 Lambda * 14.64 Programmed.</p><p></p><p>Your ACTUAL air to fuel ratio is identical (1.0 lambda), it's simply the programming that is different.</p><p></p><p>The rest of the deviation can come from the programming as well. There are tables were we can tell the ECU the O2's are not reading correctly. IE, if the programming says that at 2000RPM / low load the O2's are reading 5% richer than actual, the ECU will take that into account and adjust fueling accordingly. An aftermarket wide band will reflect the change (5% leaner) yet the stock ECU will still read 14.1 on the track app (1.0 Lambda).</p></blockquote><p></p>
[QUOTE="Shaun@AED, post: 14166459, member: 32381"] This is why learning to read Lambda makes things so much easier. Factory strategy always targets 1.0 Lambda (unless at WOT, or decel, etc), the programming determines what the Air Fuel ratio is by multiplying the Lambda by the programmed stoich. For New Factory Fords, that's 1.0 Lambda * 14.08 Programmed. For All aftermarket Air Fuel gauges that's 1.0 Lambda * 14.64 Programmed. Your ACTUAL air to fuel ratio is identical (1.0 lambda), it's simply the programming that is different. The rest of the deviation can come from the programming as well. There are tables were we can tell the ECU the O2's are not reading correctly. IE, if the programming says that at 2000RPM / low load the O2's are reading 5% richer than actual, the ECU will take that into account and adjust fueling accordingly. An aftermarket wide band will reflect the change (5% leaner) yet the stock ECU will still read 14.1 on the track app (1.0 Lambda). [/QUOTE]
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Engine/Tuning
AEM Air/fuel gauge reading high?
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