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SVT Shelby GT500
Vmp gen 2r or Whipple 2.9?
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<blockquote data-quote="4VandHemiKiller" data-source="post: 15975484" data-attributes="member: 49914"><p>You do understand that is desirable, right? You want to achieve peak power several hundred RPMs before shift point/rev limit.</p><p>A combo that achieves peak power at the rev limit will be an underperformer, with poor average power.</p><p></p><p>Simply put, take a Whipple 3.4 that's spinning under 15000 rpm rotor speed making 780 rw @ 7000+ rpm, and it will lose to a TVS 2300 spinning 23,000 rpm making 750 rwp peak power @ 6700 with a 7200 rpm shift point. Why? Because the average horsepower, area under the curve, will be drastically better on the 2.3 combo. It’s just a matter of maximizing a combo, and large underspun blowers consistently leave power under the curve on the table.</p><p></p><p>I'm not pushing one brand or another, I'm just stating a given supercharger must be properly spun to have a usable power band within the working RPM range of the engine. With a GT500 that retains a stock (or CJ) crankshaft, that's 7200 rpm or less. A Whipple 3.4 with a 2.75 upper and 5% (ATI) lower still makes peaks @ 7100-7200. The same Whipple 3.4 with less pulley/slower rotor speed will shift that peak upwards in RPM, and sacrifices average, usable power within the confines of a stock crankshaft engine and PCM.</p></blockquote><p></p>
[QUOTE="4VandHemiKiller, post: 15975484, member: 49914"] You do understand that is desirable, right? You want to achieve peak power several hundred RPMs before shift point/rev limit. A combo that achieves peak power at the rev limit will be an underperformer, with poor average power. Simply put, take a Whipple 3.4 that's spinning under 15000 rpm rotor speed making 780 rw @ 7000+ rpm, and it will lose to a TVS 2300 spinning 23,000 rpm making 750 rwp peak power @ 6700 with a 7200 rpm shift point. Why? Because the average horsepower, area under the curve, will be drastically better on the 2.3 combo. It’s just a matter of maximizing a combo, and large underspun blowers consistently leave power under the curve on the table. I'm not pushing one brand or another, I'm just stating a given supercharger must be properly spun to have a usable power band within the working RPM range of the engine. With a GT500 that retains a stock (or CJ) crankshaft, that's 7200 rpm or less. A Whipple 3.4 with a 2.75 upper and 5% (ATI) lower still makes peaks @ 7100-7200. The same Whipple 3.4 with less pulley/slower rotor speed will shift that peak upwards in RPM, and sacrifices average, usable power within the confines of a stock crankshaft engine and PCM. [/QUOTE]
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SVT Shelby GT500
Vmp gen 2r or Whipple 2.9?
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