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SVT Shelby GT500
VMP 67mm vs 69mm Throttle Body
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<blockquote data-quote="Catmonkey" data-source="post: 16321571" data-attributes="member: 124025"><p>Don't believe everything you read on the internet. VMP made a 72mm at one time that was supposedly a stones throw from the CJ monoblade flow rating. I'd speculate the 67mm is a good 200 cfm shy of that. There's a lack of credible cfm data out there, and even then they aren't necessarily at the same pressure differential. Kenne Bell claims the OEM 60mm twin, the CJ 65mm and the CJ momoblade measures 1,128 cfm, 1,322 cfm and 1,701 cfm, respectively, on their flow meters. KB claims 1,850 cfm on their own 75mm twin. Just interpolating the data, I'd estimate the 67mm and 69mm at approximately 1,400 cfm and 1,500 cfm respectively.</p><p></p><p>To put all that into perspective a 2.3 TVS with a 2.4" upper and stock lower would pump 1,442 cfm at 6,000 rpm if it were 100% efficient. Typical cfm formulas for a 5.4 will compute a 1,156 cfm requirement at 200% volumetric efficiency. The fact remains bigger throttle bodies usually make more peak power. It may have more to do with the air flow needing to turn ~120 degrees from inlet to rotors than actual air flow requirements. But there comes a point of diminishing returns. 10-15 hp at peak doesn't mean a great deal if fail safes and/or drives like crap.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 16321571, member: 124025"] Don't believe everything you read on the internet. VMP made a 72mm at one time that was supposedly a stones throw from the CJ monoblade flow rating. I'd speculate the 67mm is a good 200 cfm shy of that. There's a lack of credible cfm data out there, and even then they aren't necessarily at the same pressure differential. Kenne Bell claims the OEM 60mm twin, the CJ 65mm and the CJ momoblade measures 1,128 cfm, 1,322 cfm and 1,701 cfm, respectively, on their flow meters. KB claims 1,850 cfm on their own 75mm twin. Just interpolating the data, I'd estimate the 67mm and 69mm at approximately 1,400 cfm and 1,500 cfm respectively. To put all that into perspective a 2.3 TVS with a 2.4" upper and stock lower would pump 1,442 cfm at 6,000 rpm if it were 100% efficient. Typical cfm formulas for a 5.4 will compute a 1,156 cfm requirement at 200% volumetric efficiency. The fact remains bigger throttle bodies usually make more peak power. It may have more to do with the air flow needing to turn ~120 degrees from inlet to rotors than actual air flow requirements. But there comes a point of diminishing returns. 10-15 hp at peak doesn't mean a great deal if fail safes and/or drives like crap. [/QUOTE]
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VMP 67mm vs 69mm Throttle Body
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