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SVT Shelby GT500
Bigger blower = more power?
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<blockquote data-quote="LT1Porsche" data-source="post: 15947951" data-attributes="member: 24604"><p>So I poked around and didn't see exactly what I was looking for so just thought I'd ask.</p><p></p><p>So a couple people were standing around having a convo about upgrading blowers and turbos and I made a comment that a bigger displacement blower will make more power at a given PSI than a smaller displacement blower. It was at that point another guy chimed in and stated that PSI is PSI and it doesn't matter the blower size. He said that if a smaller and larger blower were compared at the same peak PSI they would make the same HP. Now I have personally seen a comparison that disproves his theory. Now in the past I have been taught that the turbine efficiency of a turbo increases velocity which helps move air fast therefor allowing the engine to take in more air which in turn makes more power but that's making a change that effects exhaust backpressure and the recycle of exhaust gas. How does this change in efficiency occur with a bigger blower when the exhaust side of the engine remains unchanged. I know a bigger blower works harder to create the same pressure so is the gain in HP directly related to heat or is the bigger blower also moving more air at the same time and even though both engines are seeing 15psi (lets say) the larger blower is making that same pressure with a higher volume of air. </p><p></p><p>My belief was the larger blower is moving more volume at a more efficient level therefor also creating less heat and making more power.</p><p></p><p>His argument was if both blowers were pushing the same PSI and had the same IAT they would make the same power. Which I disagreed with.</p><p></p><p>Thanks</p></blockquote><p></p>
[QUOTE="LT1Porsche, post: 15947951, member: 24604"] So I poked around and didn't see exactly what I was looking for so just thought I'd ask. So a couple people were standing around having a convo about upgrading blowers and turbos and I made a comment that a bigger displacement blower will make more power at a given PSI than a smaller displacement blower. It was at that point another guy chimed in and stated that PSI is PSI and it doesn't matter the blower size. He said that if a smaller and larger blower were compared at the same peak PSI they would make the same HP. Now I have personally seen a comparison that disproves his theory. Now in the past I have been taught that the turbine efficiency of a turbo increases velocity which helps move air fast therefor allowing the engine to take in more air which in turn makes more power but that's making a change that effects exhaust backpressure and the recycle of exhaust gas. How does this change in efficiency occur with a bigger blower when the exhaust side of the engine remains unchanged. I know a bigger blower works harder to create the same pressure so is the gain in HP directly related to heat or is the bigger blower also moving more air at the same time and even though both engines are seeing 15psi (lets say) the larger blower is making that same pressure with a higher volume of air. My belief was the larger blower is moving more volume at a more efficient level therefor also creating less heat and making more power. His argument was if both blowers were pushing the same PSI and had the same IAT they would make the same power. Which I disagreed with. Thanks [/QUOTE]
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Bigger blower = more power?
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