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Cobra Forums
2013-14 Shelby GT500
(New) Mantic clutch finally arrives
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<blockquote data-quote="Bad Company" data-source="post: 17015873" data-attributes="member: 141815"><p>I'm shooting for 1500RWHP, now whether or not it is achieved is another story. Swapping the lower up from the stock diameter to a 15% overdrive and going from a 4" upper to a 3.5" to bring the supercharger speed up to 17400RPM at 7500 engine RPM. Currently the supercharger should be moving 2085CFM, the pulley changes will increase this to 2581CFM. Now the next question is, will the throttle body become a restriction and not allow the supercharger to produce this amount of CFM of air hindering the gain in power? I guess we will find out. I think it is going to be a hard number to achieve. I've thought about swapping the supercharger out for a 4.7L, with this increase in size, the 15% over lower with a 4" upper slows the supercharger RPM down to 15281RPM for 2536CFM. Or do we use a 3.875" upper on the 4.7L for 15774 supercharger RPM with 2618CFM. These thoughts brings to my mind the thought of slowing the bigger blower down for approximately the same CFM to hopefully have less HP drag to turn the bigger blower slower for a net Hp gain at the tires. But again would the throttle body limit the airflow no matter which blower was on the car? It is an expensive question to answer and I really don't want to spend the money to find which blower is better suited to achieve the answer to this question rattling around my nimble minded brain. Now if I did upgrade to the 4.7L supercharger it would give me the ability to spin it faster to hopefully break the 1500Hp output. The downside to this is if the throttle body is too restrictive and limits airflow by an unknown percentage this will cause the supercharger to start super heating the air as it exits into the intake manifold. If the air temperature is raised too much then the gain won't be what it should be unless I run ice in the HE tank to drop the intake temperatures down. I'm also hoping by going to E98 that this helps in cooling the intake air temperatures somewhat. At this point I think it is a balancing act between a 4.2L and a 4.7L supercharger because of the throttle body. Unfortunately KB doesn't offer a larger DBW throttle body than the 168MM Mono-blade that will fit our cars.</p></blockquote><p></p>
[QUOTE="Bad Company, post: 17015873, member: 141815"] I'm shooting for 1500RWHP, now whether or not it is achieved is another story. Swapping the lower up from the stock diameter to a 15% overdrive and going from a 4" upper to a 3.5" to bring the supercharger speed up to 17400RPM at 7500 engine RPM. Currently the supercharger should be moving 2085CFM, the pulley changes will increase this to 2581CFM. Now the next question is, will the throttle body become a restriction and not allow the supercharger to produce this amount of CFM of air hindering the gain in power? I guess we will find out. I think it is going to be a hard number to achieve. I've thought about swapping the supercharger out for a 4.7L, with this increase in size, the 15% over lower with a 4" upper slows the supercharger RPM down to 15281RPM for 2536CFM. Or do we use a 3.875" upper on the 4.7L for 15774 supercharger RPM with 2618CFM. These thoughts brings to my mind the thought of slowing the bigger blower down for approximately the same CFM to hopefully have less HP drag to turn the bigger blower slower for a net Hp gain at the tires. But again would the throttle body limit the airflow no matter which blower was on the car? It is an expensive question to answer and I really don't want to spend the money to find which blower is better suited to achieve the answer to this question rattling around my nimble minded brain. Now if I did upgrade to the 4.7L supercharger it would give me the ability to spin it faster to hopefully break the 1500Hp output. The downside to this is if the throttle body is too restrictive and limits airflow by an unknown percentage this will cause the supercharger to start super heating the air as it exits into the intake manifold. If the air temperature is raised too much then the gain won't be what it should be unless I run ice in the HE tank to drop the intake temperatures down. I'm also hoping by going to E98 that this helps in cooling the intake air temperatures somewhat. At this point I think it is a balancing act between a 4.2L and a 4.7L supercharger because of the throttle body. Unfortunately KB doesn't offer a larger DBW throttle body than the 168MM Mono-blade that will fit our cars. [/QUOTE]
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(New) Mantic clutch finally arrives
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