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Boost and airflow are determined by the size of the supercharger and how fast it spins. The easy way to spin a blower faster is with pulleys. For most of the larger 6-71–style blowers, the upper and lower pulleys are interchangeable, allowing quick conversion from underdrive to overdrive ratios.
Blower Basics

 Boost and airflow are determined by the size of the supercharger and how fast it spins. The easy way to spin a blower faster is with pulleys. For most of the larger 6-71–style blowers, the upper and lower pulleys are interchangeable, allowing quick conversion from underdrive to overdrive ratios.  View Related Article

 

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