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The Terminator
Engine/Tuning
VMP internet tune or semi-local dyno tune?
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<blockquote data-quote="MalcolmV8" data-source="post: 15583410" data-attributes="member: 8854"><p>Joe, widebands don't really read A/F ratio. They read lambda. So the scale of 21 - 9.5 is just to simplify it for people to understand. That's the gasoline scale. You can use it on any fuel that won't damage the O2 sensor.</p><p></p><p>Google lambda to get a more in depth understanding. Basically lambda 1.0 is the perfect burn ratio of that fuel. If it goes positive like 1.1 that's 10% lean. If it reads 0.9 that's 10% rich.</p><p></p><p>So you're burning pure gasoline with a stoich of 14.64 and your wideband reads lambda 1. It sets your gauge to display 14.7.</p><p></p><p>Now you put in E10 gasoline which has as stoich of 14.076 but you're cruising along and it's burning perfectly fine. Wideband reads lambda 1 because it has the correct ratio of fuel to air molecules and displays 14.7 on your gauge.</p><p></p><p>You put some E85 in there which is 9.85 but its burning properly at cruise and your wideband reads lambda 1. The gauge still displays 14.7.</p><p></p><p>See how that works? So even on E85 you'll see say mid 11s on the gauge at WOT.</p><p></p><p>Now some gauges you can calibrate to display A/F numbers for your particular fuel so you can see the actual ratios. It gets overly confusing when trying to go back and forth between a lot of fuels. That's why I do everything in lambda and don't pay much attention to A/F.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 15583410, member: 8854"] Joe, widebands don't really read A/F ratio. They read lambda. So the scale of 21 - 9.5 is just to simplify it for people to understand. That's the gasoline scale. You can use it on any fuel that won't damage the O2 sensor. Google lambda to get a more in depth understanding. Basically lambda 1.0 is the perfect burn ratio of that fuel. If it goes positive like 1.1 that's 10% lean. If it reads 0.9 that's 10% rich. So you're burning pure gasoline with a stoich of 14.64 and your wideband reads lambda 1. It sets your gauge to display 14.7. Now you put in E10 gasoline which has as stoich of 14.076 but you're cruising along and it's burning perfectly fine. Wideband reads lambda 1 because it has the correct ratio of fuel to air molecules and displays 14.7 on your gauge. You put some E85 in there which is 9.85 but its burning properly at cruise and your wideband reads lambda 1. The gauge still displays 14.7. See how that works? So even on E85 you'll see say mid 11s on the gauge at WOT. Now some gauges you can calibrate to display A/F numbers for your particular fuel so you can see the actual ratios. It gets overly confusing when trying to go back and forth between a lot of fuels. That's why I do everything in lambda and don't pay much attention to A/F. [/QUOTE]
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VMP internet tune or semi-local dyno tune?
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