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2012-2013 Boss 302 Mustang
Boss 302 and Cobra Jet intake with boost question?
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<blockquote data-quote="Voltwings" data-source="post: 13672720" data-attributes="member: 155561"><p>I think you took that a little further than it needed to go lol, I didnt read all of that, but i think i can explain further.</p><p> </p><p>i come from the world of turbo 4 cylinders, namely the mazdaspeed3. Our stock k04 on 93 octane is limited to about 300 whp, and thats at about 20 psi of boost. Now i had two "big turbos" on that car, a garrett 3071, and a gtx3576. On the 3071, i was able to achieve about 350 whp on 93 octane (all else equal), and on the 3576 i was able to get just over 400 whp (again, all else equal). </p><p> </p><p>on the 3071, 350 whp came at 24 psi, and on the gtx3576 it came at 21... why is that? Because boost is a measurement of restriction between the compressor and the cylinder head. Free flowing manifolds, intercooler pipes with fewer bends (each 90* is the same as 5ft of pipe) and an overall free flowing setup will reduce the amount of work the turbo is doing by reducing that resistance. </p><p> </p><p>Since the turbo is not working as hard it will operate cooler, and produce cooler BAT's (bosot air temp, or IAT2 as some platforms call them), and reduce the chances of knock, which im sure you know the components of: Heat and pressure. We can use methanol or E85 to reduce or combat the heat, but by creating a free flowing setup we can reduce the "pressure," effectively, while maintaing airflow. </p><p> </p><p>i think where you got hung up is you were thinking of boost measured at the combustion chamber, not the intake manifold.</p><p></p><p>The same thing can be seen on Turbo'd hondas which maintain their Vtec cams, they will literally drop several PSI when the cam switches over because the system has seen a drastic increase in flow. That drop in boost however does not result in a loss of power, because the overall airflow is still maintained.</p></blockquote><p></p>
[QUOTE="Voltwings, post: 13672720, member: 155561"] I think you took that a little further than it needed to go lol, I didnt read all of that, but i think i can explain further. i come from the world of turbo 4 cylinders, namely the mazdaspeed3. Our stock k04 on 93 octane is limited to about 300 whp, and thats at about 20 psi of boost. Now i had two "big turbos" on that car, a garrett 3071, and a gtx3576. On the 3071, i was able to achieve about 350 whp on 93 octane (all else equal), and on the 3576 i was able to get just over 400 whp (again, all else equal). on the 3071, 350 whp came at 24 psi, and on the gtx3576 it came at 21... why is that? Because boost is a measurement of restriction between the compressor and the cylinder head. Free flowing manifolds, intercooler pipes with fewer bends (each 90* is the same as 5ft of pipe) and an overall free flowing setup will reduce the amount of work the turbo is doing by reducing that resistance. Since the turbo is not working as hard it will operate cooler, and produce cooler BAT's (bosot air temp, or IAT2 as some platforms call them), and reduce the chances of knock, which im sure you know the components of: Heat and pressure. We can use methanol or E85 to reduce or combat the heat, but by creating a free flowing setup we can reduce the "pressure," effectively, while maintaing airflow. i think where you got hung up is you were thinking of boost measured at the combustion chamber, not the intake manifold. The same thing can be seen on Turbo'd hondas which maintain their Vtec cams, they will literally drop several PSI when the cam switches over because the system has seen a drastic increase in flow. That drop in boost however does not result in a loss of power, because the overall airflow is still maintained. [/QUOTE]
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Boss 302 and Cobra Jet intake with boost question?
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