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The Terminator
Engine/Tuning
Self Tuning With SCT Pro Racer
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<blockquote data-quote="JAJ" data-source="post: 16415239" data-attributes="member: 131874"><p>I've been where you are and tuning can be a bit baffling, not because of the concepts but because of the language. For instance "load". Load is actually simple, but nobody explains it. It works like this. The Misc -> Scalar -> Engine Displacement value is the weight in pounds of the air in the swept volume of one cylinder when the engine is stopped. The more the displacement, the larger this number gets. Load is just the ratio of the weight of air that actually gets into each cylinder when the engine is running divided by this static value when it's stopped. Simple, actually.</p><p></p><p>If you have a NA engine, then load usually tops out around 1, although a clever intake manifold that uses tuned pipes can get it above one, maybe as much as 1.2. With a blower, you can get any load you want, at least until something breaks.</p><p></p><p>You can calculate load by first taking MAF in pounds per minute and dividing it by RPM to get the air intake per revolution. Then divide that result by 4 because the air from every revolution is split between 4 cylinders. That'll tell you how much air is getting into each cylinder. To calculate load, divide that by the number in Misc -> Scalar -> Engine Displacement.</p><p></p><p>Thing is, this only works if you have an accurate MAF curve - accurate in the sense that if it says 50 pounds per minute, it's actually 50 pounds per minute. When you tune AFR by changing the MAF curve, that calibration goes out the window, and it's hard to know what "load" actually means.</p></blockquote><p></p>
[QUOTE="JAJ, post: 16415239, member: 131874"] I've been where you are and tuning can be a bit baffling, not because of the concepts but because of the language. For instance "load". Load is actually simple, but nobody explains it. It works like this. The Misc -> Scalar -> Engine Displacement value is the weight in pounds of the air in the swept volume of one cylinder when the engine is stopped. The more the displacement, the larger this number gets. Load is just the ratio of the weight of air that actually gets into each cylinder when the engine is running divided by this static value when it's stopped. Simple, actually. If you have a NA engine, then load usually tops out around 1, although a clever intake manifold that uses tuned pipes can get it above one, maybe as much as 1.2. With a blower, you can get any load you want, at least until something breaks. You can calculate load by first taking MAF in pounds per minute and dividing it by RPM to get the air intake per revolution. Then divide that result by 4 because the air from every revolution is split between 4 cylinders. That'll tell you how much air is getting into each cylinder. To calculate load, divide that by the number in Misc -> Scalar -> Engine Displacement. Thing is, this only works if you have an accurate MAF curve - accurate in the sense that if it says 50 pounds per minute, it's actually 50 pounds per minute. When you tune AFR by changing the MAF curve, that calibration goes out the window, and it's hard to know what "load" actually means. [/QUOTE]
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