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2020+ Shelby GT500 Mustang
Numbers soon?
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<blockquote data-quote="tt335ci03cobra" data-source="post: 16173905" data-attributes="member: 68944"><p>Compression is usually worth 3% per point. I was way off there, typed it too fast.</p><p></p><p>2.5pts down of compression would be about 7.5% down so all in all 478/1.06= 445hp.</p><p></p><p>445hp*(12/14.7+1) is 808hp.</p><p>445hp*(11/14.7+1) is 778hp.</p><p>445hp*(10/14.7+1) is 748hp.</p><p></p><p>Buuuuuut, we aren’t factoring in parasitic drag of about 50hp at 7500rpm on a 2.65 TVS so...</p><p></p><p>12psi= 758hp</p><p>11psi=728hp</p><p>10psi=698hp</p><p></p><p>They could run 13psi or 12.5psi and be fine imo.</p><p></p><p>To test that math, I did it on my cobra’s turbo cammer clone. I have an 09 cammer block, stage 3 gt500 heads/cams, and cammer intake. I assumed 500hp crank.</p><p></p><p>500*(10.78/14.7+1)=866.67hp.</p><p></p><p>I put down 815whp on 10.78psi.</p><p></p><p>Obviously the grand am cup cammer mills made north of 400whp but shy of 450whp in uncorked condition. Mine is a hair lower on compression, but more aggressive head and cam. That wouldn’t matter na, but I assumed 450whp/500hp because with boost my engine has more potential to make power than a traditional cammer mill did.</p></blockquote><p></p>
[QUOTE="tt335ci03cobra, post: 16173905, member: 68944"] Compression is usually worth 3% per point. I was way off there, typed it too fast. 2.5pts down of compression would be about 7.5% down so all in all 478/1.06= 445hp. 445hp*(12/14.7+1) is 808hp. 445hp*(11/14.7+1) is 778hp. 445hp*(10/14.7+1) is 748hp. Buuuuuut, we aren’t factoring in parasitic drag of about 50hp at 7500rpm on a 2.65 TVS so... 12psi= 758hp 11psi=728hp 10psi=698hp They could run 13psi or 12.5psi and be fine imo. To test that math, I did it on my cobra’s turbo cammer clone. I have an 09 cammer block, stage 3 gt500 heads/cams, and cammer intake. I assumed 500hp crank. 500*(10.78/14.7+1)=866.67hp. I put down 815whp on 10.78psi. Obviously the grand am cup cammer mills made north of 400whp but shy of 450whp in uncorked condition. Mine is a hair lower on compression, but more aggressive head and cam. That wouldn’t matter na, but I assumed 450whp/500hp because with boost my engine has more potential to make power than a traditional cammer mill did. [/QUOTE]
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2020+ Shelby GT500 Mustang
Numbers soon?
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