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<blockquote data-quote="tt335ci03cobra" data-source="post: 16222870" data-attributes="member: 68944"><p>To put your mind at ease, shoot for 650-750whp depending on how much you rally or care for the car. If you just go wot often and don’t let it cool between blasts stay around 650whp on pump gas. If you are reasonable go for 700-750whp. </p><p></p><p>A decent rule of thumb on 91 octane is 150whp/L from what I’ve seen on stock long block 03 cobra’s. Every engine is different.</p><p></p><p>4.6x150whp= 690whp. I’ve personally had 4.6’s with 756whp on 15psi with 57’s, 810whp on a 5.4 with 57’s, and 815whp on my current 5.3 with 62’s. </p><p></p><p>150x5.3= 795, and I’m around 815.</p><p>150x4.6= 690 I went 756</p><p>150x5.4= 810, and I went 810.</p><p></p><p>Everyone will have different results. Get it in a tuners hands and have them explain it in person.</p><p></p><p>You’re better making 700whp with 10psi than you are making 650whp with 15psi. Psi=resistance to flow. That creates heat and heat creates booms</p></blockquote><p></p>
[QUOTE="tt335ci03cobra, post: 16222870, member: 68944"] To put your mind at ease, shoot for 650-750whp depending on how much you rally or care for the car. If you just go wot often and don’t let it cool between blasts stay around 650whp on pump gas. If you are reasonable go for 700-750whp. A decent rule of thumb on 91 octane is 150whp/L from what I’ve seen on stock long block 03 cobra’s. Every engine is different. 4.6x150whp= 690whp. I’ve personally had 4.6’s with 756whp on 15psi with 57’s, 810whp on a 5.4 with 57’s, and 815whp on my current 5.3 with 62’s. 150x5.3= 795, and I’m around 815. 150x4.6= 690 I went 756 150x5.4= 810, and I went 810. Everyone will have different results. Get it in a tuners hands and have them explain it in person. You’re better making 700whp with 10psi than you are making 650whp with 15psi. Psi=resistance to flow. That creates heat and heat creates booms [/QUOTE]
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