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SVT Shelby GT500
'13 GT500 parts that will retrofit to any '07-'12...
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<blockquote data-quote="Ry_Trapp0" data-source="post: 11219437" data-attributes="member: 27761"><p>the only way a larger displacement engine should lose power is if the smaller displacement engine is using every bit of the volume of air from the supercharger, which with a roots would (theoretically) mean that boost PSI would be 0 since there is nothing holding up the air for it to be compressed(roots superchargers compress air int he intake manifold). so basically, you could take a completely stock shelby 5.4l, bore it out to 5.8l without making any other changes at all(aside from an appropriate tune), and it would produce a little more HP because it's taking in more air that would otherwise be stuck in the intake manifold. because more air is being used by the 5.8l, the PSI in the intake manifold would drop from the ~10PSI of the 5.4l because there is more air in the cylinders and less air to be compressed in the intake manifold.</p><p>think of compressed air out of a supercharger as the speed of a waiting line. the higher the PSI, the slower the waiting line is moving and the slower the air is getting into the cylinders. but if your, say, port your heads, you may drop 1 or 2 PSI because your waiting line is moving much faster, getting more air into the cylinder. of course, the reason we increase boost PSI is to straight up force the into the cylinders. this isn't as efficient(generates a lot of heat there by reducing oxygen density), but generally easier(pulley + tune vs ported heads).</p><p></p><p>someone correct me if i'm wrong here, i think i got the fundamentals.</p></blockquote><p></p>
[QUOTE="Ry_Trapp0, post: 11219437, member: 27761"] the only way a larger displacement engine should lose power is if the smaller displacement engine is using every bit of the volume of air from the supercharger, which with a roots would (theoretically) mean that boost PSI would be 0 since there is nothing holding up the air for it to be compressed(roots superchargers compress air int he intake manifold). so basically, you could take a completely stock shelby 5.4l, bore it out to 5.8l without making any other changes at all(aside from an appropriate tune), and it would produce a little more HP because it's taking in more air that would otherwise be stuck in the intake manifold. because more air is being used by the 5.8l, the PSI in the intake manifold would drop from the ~10PSI of the 5.4l because there is more air in the cylinders and less air to be compressed in the intake manifold. think of compressed air out of a supercharger as the speed of a waiting line. the higher the PSI, the slower the waiting line is moving and the slower the air is getting into the cylinders. but if your, say, port your heads, you may drop 1 or 2 PSI because your waiting line is moving much faster, getting more air into the cylinder. of course, the reason we increase boost PSI is to straight up force the into the cylinders. this isn't as efficient(generates a lot of heat there by reducing oxygen density), but generally easier(pulley + tune vs ported heads). someone correct me if i'm wrong here, i think i got the fundamentals. [/QUOTE]
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SVT Shelby GT500
'13 GT500 parts that will retrofit to any '07-'12...
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