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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Timing and Lambda
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<blockquote data-quote="jn2" data-source="post: 15390371" data-attributes="member: 178010"><p>It's really going to depend on how your modifier and multiplier table are set for both lambda and spark. They operate on the same principle. They have a set modifier and set multipliers determined by ethanol content inferred by the ECM. These values are set by your tuner and are applied to your base spark tables(borderline). </p><p></p><p>I have mine set to tun .87 lambda at 85% ethanol and .83 on 10% ethanol. What the ECM will do is adjust WOT lambda based on that range. In my case it's .4. So say for example the car infers 30% ethanol, it will add add 30% of the .4. If it infers e70 it will add 70% of the .4. If it infers e85 it will add 100% of the .4.</p><p></p><p>As far as spark it's going to really depend on your location and IAT's. The stock IAT modifiers for 100*+ intake temps cut timing down a lot, so assuming the car is in motion with <100*f intake temps you should see anywhere from 28-32* of spark advanced assuming no Kr is detected and you are running a high ethanol percentage. I am personally seeing 28.5* with 100* ambient temps</p></blockquote><p></p>
[QUOTE="jn2, post: 15390371, member: 178010"] It's really going to depend on how your modifier and multiplier table are set for both lambda and spark. They operate on the same principle. They have a set modifier and set multipliers determined by ethanol content inferred by the ECM. These values are set by your tuner and are applied to your base spark tables(borderline). I have mine set to tun .87 lambda at 85% ethanol and .83 on 10% ethanol. What the ECM will do is adjust WOT lambda based on that range. In my case it's .4. So say for example the car infers 30% ethanol, it will add add 30% of the .4. If it infers e70 it will add 70% of the .4. If it infers e85 it will add 100% of the .4. As far as spark it's going to really depend on your location and IAT's. The stock IAT modifiers for 100*+ intake temps cut timing down a lot, so assuming the car is in motion with <100*f intake temps you should see anywhere from 28-32* of spark advanced assuming no Kr is detected and you are running a high ethanol percentage. I am personally seeing 28.5* with 100* ambient temps [/QUOTE]
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Timing and Lambda
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