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Supercharger Pulley Boost Calculator Online

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Superchargers are a popular addition to high-performance vehicles, as they significantly boost engine power. However, to maximize their efficiency, it’s crucial to calculate the boost pressure accurately. This is where the supercharger pulley boost calculator comes into play.

Formula of Supercharger Pulley Boost Calculator

The boost pressure (measured in PSI, pounds per square inch) can be calculated using the following formula:

Boost Pressure (PSI) = (Supercharger Pulley Size / Crankshaft Pulley Size) * (Engine Displacement / 14.7) * (Supercharger Speed / Engine Speed)


  • Supercharger Pulley Size is the diameter of the supercharger pulley in inches.
  • Crankshaft Pulley Size is the diameter of the crankshaft pulley in inches.
  • Engine Displacement is the engine’s displacement in cubic inches.
  • Supercharger Speed is the rotational speed of the supercharger in revolutions per minute (RPM).
  • Engine Speed is the rotational speed of the engine in RPM.

This formula takes into account various factors, including the sizes of the pulleys, engine displacement, and the speeds of both the supercharger and the engine. It provides a precise measurement of the boost pressure, which is vital for tuning and optimizing the performance of a supercharged engine.

General Terms Table

Here’s a quick reference table for some general terms related to supercharger systems and conversions:

Supercharger BeltThe belt connecting the supercharger pulley to the crankshaft pulley.
IntercoolerA device that cools the compressed air before it enters the engine.
Boost GaugeAn instrument that displays the current boost pressure in the supercharger system.
Cubic Inches (CI)A unit of measurement for engine displacement. 1 cubic inch = 16.39 cubic centimeters.
Pulley RatioThe ratio of the supercharger pulley size to the crankshaft pulley size.
RPM (Revolutions Per Minute)A measure of rotational speed.

These terms will help you understand the supercharger system more comprehensively.

Example of Supercharger Pulley Boost Calculator

Let’s illustrate how to use the supercharger pulley boost calculator with an example:

Suppose you have the following values:

  • Supercharger Pulley Size: 3.5 inches
  • Crankshaft Pulley Size: 6 inches
  • Engine Displacement: 350 cubic inches
  • Supercharger Speed: 6000 RPM
  • Engine Speed: 7500 RPM

Using the formula, we can calculate the boost pressure:

Boost Pressure (PSI) = (3.5 / 6) * (350 / 14.7) * (6000 / 7500) = 5.18 PSI

So, in this example, the boost pressure is approximately 5.18 PSI.

Most Common FAQs

Q1: Why is boost pressure important in a supercharger system?

A1: Boost pressure directly affects engine power and performance. It’s crucial for fine-tuning and optimizing a supercharged engine’s performance.

Q2: Can I use the same formula for metric units?

A2: Yes, you can use the formula with metric units, but ensure consistency in the units used.

Q3: What’s the ideal boost pressure for my engine?

A3: The ideal boost pressure depends on your engine’s design and intended use. Consult your manufacturer or a professional tuner for recommendations.

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