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SVT Shelby GT500
Bigger blower = more power?
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<blockquote data-quote="Catmonkey" data-source="post: 15955343" data-attributes="member: 124025"><p>Here's Eaton's own analysis of the difference between the TVS 2.3 and the 2.65.</p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"><strong>R2650 versus R2300</strong></span></p><ul> <li data-xf-list-type="ul"> 4% more efficient</li> <li data-xf-list-type="ul">15% larger (2300cc vs. 2650 cc)</li> <li data-xf-list-type="ul">18% less input power required</li> <li data-xf-list-type="ul">25% more air flow at 18,000 RPM and 14 psi boost (2.0 Pressure Ratio)</li> <li data-xf-list-type="ul">72% isentropic efficiency vs. 68%</li> </ul><p>Eaton also makes it's supercharger maps available. Assuming both superchargers are turning 6,000 rpm at 17 psi, the 2.65 would be operating in an isentropic efficiency of 66%, while the 2.3 was 11% less at 55%. There's no doubt in my mind that the 2.3 is starting at run out of steam on our engine peaks for the 5.4 and moreso on the 5.8. It gets worse when we change our fuel source to E85. I also don't believe the 2.65 falls into the category of too big. </p><p></p><p>I would like to see how the Gen 3 would compare to a 3.5 to 4 liter blower using pump gas. I think that comparison would change the bigger is better dynamic, but again I think the answer is it depends on what blowers are in the analysis. I'm sure the bigger blower would come out on top if we changed the fuel source to E85 where the engine can tolerate a lot more boost. </p><p></p><p>What I really like to know is how your torque peaks compared between the 2.3 and 2.65?</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 15955343, member: 124025"] Here's Eaton's own analysis of the difference between the TVS 2.3 and the 2.65. [size=4][b][/b] [b]R2650 versus R2300[/b][/size] [LIST] [*] 4% more efficient [*]15% larger (2300cc vs. 2650 cc) [*]18% less input power required [*]25% more air flow at 18,000 RPM and 14 psi boost (2.0 Pressure Ratio) [*]72% isentropic efficiency vs. 68% [/LIST] Eaton also makes it's supercharger maps available. Assuming both superchargers are turning 6,000 rpm at 17 psi, the 2.65 would be operating in an isentropic efficiency of 66%, while the 2.3 was 11% less at 55%. There's no doubt in my mind that the 2.3 is starting at run out of steam on our engine peaks for the 5.4 and moreso on the 5.8. It gets worse when we change our fuel source to E85. I also don't believe the 2.65 falls into the category of too big. I would like to see how the Gen 3 would compare to a 3.5 to 4 liter blower using pump gas. I think that comparison would change the bigger is better dynamic, but again I think the answer is it depends on what blowers are in the analysis. I'm sure the bigger blower would come out on top if we changed the fuel source to E85 where the engine can tolerate a lot more boost. What I really like to know is how your torque peaks compared between the 2.3 and 2.65? [/QUOTE]
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