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The Terminator
Engine/Tuning
how does a tune effect fuel economy.
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<blockquote data-quote="WDW MKR" data-source="post: 5203173" data-attributes="member: 8038"><p>You're completely correct that most of these <em>shouldn't</em> happen, but they do. We're dealing with numerical changes in the 1000ths/10000ths when it comes to tweaking MAF Transfers and IAC tables. The slightest mistake in entering a value can throw the tune way off. Also, some tuner <em>(absolutely no reference to RET)</em> have back-door ways of accomplishing things. These methods can dial a tune for set conditions, but venturing outside said conditions <em>(namely weather)</em> can reveal a tune with values that max the O2 sensors.</p><p></p><p>And it's not the pulley that will effect your low-end MAF Transfer tuning: it's things like CAI, injectors, MAFia... things that effect air entry into the MAF or require adjustments to scalars that then effect the MAF Transfer indirectly.</p><p></p><p>I agree that low-end spark and fuel tables should more often that not be left alone. Mods like cams and changes to compression can often require changes in these areas.</p></blockquote><p></p>
[QUOTE="WDW MKR, post: 5203173, member: 8038"] You're completely correct that most of these [i]shouldn't[/i] happen, but they do. We're dealing with numerical changes in the 1000ths/10000ths when it comes to tweaking MAF Transfers and IAC tables. The slightest mistake in entering a value can throw the tune way off. Also, some tuner [i](absolutely no reference to RET)[/i] have back-door ways of accomplishing things. These methods can dial a tune for set conditions, but venturing outside said conditions [i](namely weather)[/i] can reveal a tune with values that max the O2 sensors. And it's not the pulley that will effect your low-end MAF Transfer tuning: it's things like CAI, injectors, MAFia... things that effect air entry into the MAF or require adjustments to scalars that then effect the MAF Transfer indirectly. I agree that low-end spark and fuel tables should more often that not be left alone. Mods like cams and changes to compression can often require changes in these areas. [/QUOTE]
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