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2015+ Shelby GT350 Mustang
Forced Induction: Whipple or Twins
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<blockquote data-quote="tt335ci03cobra" data-source="post: 16071319" data-attributes="member: 68944"><p>If you want 450wtq at 2300rpm instead of 350wtq at 2300rpm, then yes, the whipple will feel a little more powerful than the turbo car at 2300rpm.</p><p></p><p>Angry, you are correct on that.</p><p></p><p>I assumed you meant low rpm as 2-4k, mid as 4-6k and high as 6-8k.</p><p></p><p>If your saying the whipped will have more torque at 2-3krpm and the turbos have more torque and power from 3k to 8k, then I agree with you.</p><p></p><p>I’ve had one combo that everyone said would be killer. I put 57’s on a 5.4 with stock 03 cobra heads and cams. It made 600wtq around 2500rpm, over 900wtq at 4K and peaked at 900whp at 6k.</p><p></p><p>I would routinely spool it up at very low rpm. Melted #8 cruising at 40mph in 3rd gear around 1800rpm. Too much crank case pressure and cylinder pressure.</p><p></p><p>Engines don’t want or like high pressure low rpm conditions. They can’t expel what’s there, this creates higher cylinder temp and can lead to pre ignition.</p><p></p><p>I’ve been in whipple gt350’s, they aren’t gt500’s at 2k rpm, but man are they screaming up top. I’d say a whipple gt350 feels so fun because it keeps the linear feel of what you’d assume a gt350 feels like. When you drive a gt350 you realize it’s set up for midrange punch much more so than peak power. They left 50 peak hp on the table to widen and fatten/stretch the midrange. The whipple gives you the factory experience you expect.</p><p></p><p>It’s clear in these graphs. Stock vs whipple</p><p></p><p>[ATTACH=full]1533879[/ATTACH]</p><p></p><p>The sc only nets 75-100wtq at very low rpm. It fully fills the chambers at peak rpm. The parasitic nature of the blower as well as the cam profile makes a whipple feel like a rotex or centri on these cars. What’s funny is a centri actually makes more average power than a whipple from what I’ve seen. Pd blowers will quickly supply air, but eat from the gains as rpm rises. The drag on a voodoo mill is strong enough that pullied for only 8psi, there is just barely enough airflow to fully fill the chambers at 8krpm. The turbo system had done this by 3500-4000. That’s exactly why I’ve stuck to my opinion for the last of what I call the low range, all of the mid and high range. The charting and physics verify that.</p><p></p><p>That said, it sure is fun behind the wheel. The whipple gt350 I drove was one of the funnest street cars I’ve driven. Exceptional, almost perfect. I think a whipple gt350r would be incredibly fun.</p><p></p><p>Too much torque is useless. When I did my latest build, I put rpm and linearity at the front of my mind and torque Wasn’t even stressed. Still ended up with 700wtq at 4500rpm with 800whp at 7000.</p></blockquote><p></p>
[QUOTE="tt335ci03cobra, post: 16071319, member: 68944"] If you want 450wtq at 2300rpm instead of 350wtq at 2300rpm, then yes, the whipple will feel a little more powerful than the turbo car at 2300rpm. Angry, you are correct on that. I assumed you meant low rpm as 2-4k, mid as 4-6k and high as 6-8k. If your saying the whipped will have more torque at 2-3krpm and the turbos have more torque and power from 3k to 8k, then I agree with you. I’ve had one combo that everyone said would be killer. I put 57’s on a 5.4 with stock 03 cobra heads and cams. It made 600wtq around 2500rpm, over 900wtq at 4K and peaked at 900whp at 6k. I would routinely spool it up at very low rpm. Melted #8 cruising at 40mph in 3rd gear around 1800rpm. Too much crank case pressure and cylinder pressure. Engines don’t want or like high pressure low rpm conditions. They can’t expel what’s there, this creates higher cylinder temp and can lead to pre ignition. I’ve been in whipple gt350’s, they aren’t gt500’s at 2k rpm, but man are they screaming up top. I’d say a whipple gt350 feels so fun because it keeps the linear feel of what you’d assume a gt350 feels like. When you drive a gt350 you realize it’s set up for midrange punch much more so than peak power. They left 50 peak hp on the table to widen and fatten/stretch the midrange. The whipple gives you the factory experience you expect. It’s clear in these graphs. Stock vs whipple [ATTACH=full]1533879[/ATTACH] The sc only nets 75-100wtq at very low rpm. It fully fills the chambers at peak rpm. The parasitic nature of the blower as well as the cam profile makes a whipple feel like a rotex or centri on these cars. What’s funny is a centri actually makes more average power than a whipple from what I’ve seen. Pd blowers will quickly supply air, but eat from the gains as rpm rises. The drag on a voodoo mill is strong enough that pullied for only 8psi, there is just barely enough airflow to fully fill the chambers at 8krpm. The turbo system had done this by 3500-4000. That’s exactly why I’ve stuck to my opinion for the last of what I call the low range, all of the mid and high range. The charting and physics verify that. That said, it sure is fun behind the wheel. The whipple gt350 I drove was one of the funnest street cars I’ve driven. Exceptional, almost perfect. I think a whipple gt350r would be incredibly fun. Too much torque is useless. When I did my latest build, I put rpm and linearity at the front of my mind and torque Wasn’t even stressed. Still ended up with 700wtq at 4500rpm with 800whp at 7000. [/QUOTE]
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Forced Induction: Whipple or Twins
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