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SVT Shelby GT500
Bigger blower = more power?
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<blockquote data-quote="Catmonkey" data-source="post: 15947984" data-attributes="member: 124025"><p>I believe efficiency does indeed impact usable power under the curve. You're ignoring the characteristics of a bigger blower by isolating a single data point at the peak power output. I've seen a whole lot of dynos that show reduced boost with bigger blowers in the lower rpm range which also reduces torque. You might make more power at the peak with a bigger blower, but if it's too big, it acts just like a centrifugal blower and tends to make boost in a progressive fashion, not linear like a proportionately sized blower would make. </p><p></p><p>So in your example let's say a smaller blower is making 15 psi of boost through the pull and your bigger blower is making 10 psi at the hit because it's out of it's efficiency range below 5,500 rpm. Will the resultant parasitic loss in spinning slower make up for the reduced torque and horsepower? Only the track will tell? I tend to look at average horsepower and torque, not just what it makes at the peak. There are a lot of trade offs in the bigger vs smaller debate. Just remember, we can't just drive at the peak.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 15947984, member: 124025"] I believe efficiency does indeed impact usable power under the curve. You're ignoring the characteristics of a bigger blower by isolating a single data point at the peak power output. I've seen a whole lot of dynos that show reduced boost with bigger blowers in the lower rpm range which also reduces torque. You might make more power at the peak with a bigger blower, but if it's too big, it acts just like a centrifugal blower and tends to make boost in a progressive fashion, not linear like a proportionately sized blower would make. So in your example let's say a smaller blower is making 15 psi of boost through the pull and your bigger blower is making 10 psi at the hit because it's out of it's efficiency range below 5,500 rpm. Will the resultant parasitic loss in spinning slower make up for the reduced torque and horsepower? Only the track will tell? I tend to look at average horsepower and torque, not just what it makes at the peak. There are a lot of trade offs in the bigger vs smaller debate. Just remember, we can't just drive at the peak. [/QUOTE]
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SVT Shelby GT500
Bigger blower = more power?
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