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2013-14 Shelby GT500
Why more torque with lower pulley?
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<blockquote data-quote="1320 Junkie" data-source="post: 13690526" data-attributes="member: 96955"><p>Same 2.9 blowers pretty sure Stangfreak said that....same stock 4.6L motors..both cars had free flowing exhaust. The variable are no different from 4.6 to 5.4 both utilize same pulley configuration. Rotor speed is rotor speed....if a 2.5" upper = 20 psi and a 3.0" + 4lb lower = 20 psi....both at 20k rotor rpms...the car with the lower pulley isnt out tq'ing the upper only...sorry...this is a myth I've seen the myth dispoven time and time again..since 03'</p><p></p><p>Lower pullies are a tool to achieve less belt slip or gain rotor rpm...that's it. If someone says they gained 50lb/ft tq with a lower pulley over a upper pulley only I would have to say they were expieriencing belt slip no other reason with all things being equal should a lower pulley magically gain tq.</p></blockquote><p></p>
[QUOTE="1320 Junkie, post: 13690526, member: 96955"] Same 2.9 blowers pretty sure Stangfreak said that....same stock 4.6L motors..both cars had free flowing exhaust. The variable are no different from 4.6 to 5.4 both utilize same pulley configuration. Rotor speed is rotor speed....if a 2.5" upper = 20 psi and a 3.0" + 4lb lower = 20 psi....both at 20k rotor rpms...the car with the lower pulley isnt out tq'ing the upper only...sorry...this is a myth I've seen the myth dispoven time and time again..since 03' Lower pullies are a tool to achieve less belt slip or gain rotor rpm...that's it. If someone says they gained 50lb/ft tq with a lower pulley over a upper pulley only I would have to say they were expieriencing belt slip no other reason with all things being equal should a lower pulley magically gain tq. [/QUOTE]
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2013-14 Shelby GT500
Why more torque with lower pulley?
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