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Vortech Supercharger Impeller Speeds
After we purchase a supercharger and become addicted to the power, we usually want to increase the
horsepower level. With superchargers, as long your other supporting hardware is up to par, it's as
simple as a pulley swap. However, there are several things you need to consider prior to putting on
the smallest pulley you can find. This page will focus on the Vortech V1 / V2 S-Trim and SC-Trim
supercharger applications. Some of the considerations include your engine compression ratio, the
strength of your engine block and components, fuel injector and pump supply, engine management
systems, and bypass valve needs based on boost levels. Both the V1 / V2 S-Trim and SC-Trim
superchargers are capable of pushing 20 psi of boost. To allow your supercharger to live a healthy life,
Vortech recommends a maximum impeller speed of 50,000 RPM for the S-Trim and 53,000 RPM for the
SC-Trim to keep the internal bearings from destructing. The following formulas will help you decide just
how far to push your combination and the charts below will give you a quick reference.
Calculations for Impeller Speeds:
Impeller Speed (Serpentine Pulley systems) =
Crank Pulley Diameter x Step Up Ratio x Engine RPM at Shift
Supercharger Pulley Diameter
Impeller Speed (Cog Pulley Systems) =
# of Crank Pulley Teeth x Step Up Ratio x Engine RPM at Shift
# of Cog Supercharger Pulley Teeth
Step Up Ratios:
V1 Superchargers: 3.45
V2 Superchargers: 3.60
After we purchase a supercharger and become addicted to the power, we usually want to increase the
horsepower level. With superchargers, as long your other supporting hardware is up to par, it's as
simple as a pulley swap. However, there are several things you need to consider prior to putting on
the smallest pulley you can find. This page will focus on the Vortech V1 / V2 S-Trim and SC-Trim
supercharger applications. Some of the considerations include your engine compression ratio, the
strength of your engine block and components, fuel injector and pump supply, engine management
systems, and bypass valve needs based on boost levels. Both the V1 / V2 S-Trim and SC-Trim
superchargers are capable of pushing 20 psi of boost. To allow your supercharger to live a healthy life,
Vortech recommends a maximum impeller speed of 50,000 RPM for the S-Trim and 53,000 RPM for the
SC-Trim to keep the internal bearings from destructing. The following formulas will help you decide just
how far to push your combination and the charts below will give you a quick reference.
Calculations for Impeller Speeds:
Impeller Speed (Serpentine Pulley systems) =
Crank Pulley Diameter x Step Up Ratio x Engine RPM at Shift
Supercharger Pulley Diameter
Impeller Speed (Cog Pulley Systems) =
# of Crank Pulley Teeth x Step Up Ratio x Engine RPM at Shift
# of Cog Supercharger Pulley Teeth
Step Up Ratios:
V1 Superchargers: 3.45
V2 Superchargers: 3.60
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