Supercharger Pulley Boost Calculator

Supercharger Pulley Boost Formula:

\[ Boost = \left( \frac{\text{Crank Pulley}}{\text{SC Pulley}} \right) \times \text{Max Boost} \]

Calculated Boost:

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1. What is Supercharger Pulley Boost Calculation?

The supercharger pulley boost calculation determines the expected boost pressure based on the ratio between the crank pulley and supercharger pulley diameters, multiplied by the maximum boost capability of the supercharger system.

2. How Does the Calculator Work?

The calculator uses the pulley boost formula:

\[ Boost = \left( \frac{\text{Crank Pulley}}{\text{SC Pulley}} \right) \times \text{Max Boost} \]

Where:

\( \text{Crank Pulley} \) — Diameter of the crankshaft pulley (inches)
\( \text{SC Pulley} \) — Diameter of the supercharger pulley (inches)
\( \text{Max Boost} \) — Maximum boost pressure the supercharger can produce (psi)

Explanation: The pulley ratio determines how much the supercharger is overdriven relative to engine speed, which directly affects the boost pressure output.

3. Importance of Pulley Ratio Calculation

Details: Accurate pulley ratio calculation is crucial for proper supercharger system tuning, ensuring optimal boost levels without over-stressing the engine or supercharger components.

4. Using the Calculator

Tips: Enter all pulley diameters in inches and max boost in psi. Ensure accurate measurements for precise results. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal pulley ratio for my application?
A: The ideal ratio depends on your engine's capabilities, supercharger type, and desired boost levels. Consult your supercharger manufacturer's recommendations.

Q2: Can I use this calculator for different supercharger types?
A: Yes, this formula works for roots-type, centrifugal, and twin-screw superchargers, though actual results may vary based on specific supercharger efficiency.

Q3: What are safe boost levels for my engine?
A: Safe boost levels depend on your engine's internals, fuel system, and tuning. Always consult with a professional tuner for your specific setup.

Q4: How does pulley size affect supercharger speed?
A: A smaller supercharger pulley or larger crank pulley increases supercharger RPM relative to engine RPM, producing more boost but also more heat and stress.

Q5: Should I consider belt slip in my calculations?
A: Yes, belt slip can reduce actual boost below calculated values. Proper belt tension and pulley alignment are essential for accurate boost delivery.