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safe boost levels
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<blockquote data-quote="tt335ci03cobra" data-source="post: 16222867" data-attributes="member: 68944"><p>If you have head work you want to go off oxygen and octane count.</p><p></p><p>I made this on 10.7psi. 5.3 (4.6 based) stage 3 head and cam, twin 62’s, 91 octane pump gas.</p><p></p><p>[ATTACH=full]1580310[/ATTACH] </p><p></p><p>Boost literally means **** all.</p><p></p><p>I can build a modular with 30psi that will get shit on by a coyote on 6psi and vice versa.</p><p></p><p>Psi is pressure per square inch. Having a 76mm turbo on a stock longblock 03 at 15-19psi can make 650whp. Take that same combo, but put a star 3 head and cam on it, and it will drop from 15-19psi down to 12-16psi. </p><p></p><p>Boost is a measurement of restriction.</p><p></p><p>My combo put down 1070whp on 20psi with race gas and 1200whp on 30psi. If I swapped my turbos for a pair of 52’s or a single 80 at 20psi, it would lose ~125whp. If I swapped up to twin 76’s it would gain ~250whp on 30psi. </p><p></p><p>Oxygen and fuel dictate what power can be made.</p><p></p><p>I can pulley a stock Eaton for 100psi, won’t do shit. I can set a single 106 to 10 psi and walk all over a single 76 at 15-19psi</p><p></p><p>15psi in a 1/2” garden hose is no where near the amount of oxygen as 1psi in a 3” vacuum hose. </p><p></p><p>30psi in a tiny t2 28mm turbo is going to be cute and cuddly with maybe 350whp.</p><p></p><p>30psi on my twin 62’s makes 1200whp. </p><p></p><p>I hope the context makes sense. </p><p></p><p>Also, 30psi through my 62’s but on a stock cobra 4.6 would only make like 950-1050whp. head flow etc will all hangs with boost reading.</p></blockquote><p></p>
[QUOTE="tt335ci03cobra, post: 16222867, member: 68944"] If you have head work you want to go off oxygen and octane count. I made this on 10.7psi. 5.3 (4.6 based) stage 3 head and cam, twin 62’s, 91 octane pump gas. [ATTACH=full]1580310[/ATTACH] Boost literally means **** all. I can build a modular with 30psi that will get shit on by a coyote on 6psi and vice versa. Psi is pressure per square inch. Having a 76mm turbo on a stock longblock 03 at 15-19psi can make 650whp. Take that same combo, but put a star 3 head and cam on it, and it will drop from 15-19psi down to 12-16psi. Boost is a measurement of restriction. My combo put down 1070whp on 20psi with race gas and 1200whp on 30psi. If I swapped my turbos for a pair of 52’s or a single 80 at 20psi, it would lose ~125whp. If I swapped up to twin 76’s it would gain ~250whp on 30psi. Oxygen and fuel dictate what power can be made. I can pulley a stock Eaton for 100psi, won’t do shit. I can set a single 106 to 10 psi and walk all over a single 76 at 15-19psi 15psi in a 1/2” garden hose is no where near the amount of oxygen as 1psi in a 3” vacuum hose. 30psi in a tiny t2 28mm turbo is going to be cute and cuddly with maybe 350whp. 30psi on my twin 62’s makes 1200whp. I hope the context makes sense. Also, 30psi through my 62’s but on a stock cobra 4.6 would only make like 950-1050whp. head flow etc will all hangs with boost reading. [/QUOTE]
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