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Supercharger Boost Formula:
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The supercharger boost calculation estimates the amount of boost pressure generated by a supercharger based on engine displacement, RPM, and supercharger efficiency. This helps in tuning and understanding forced induction system performance.
The calculator uses the supercharger boost formula:
Where:
Explanation: The formula calculates the theoretical boost pressure based on the volume of air moved by the supercharger relative to engine displacement and supercharger efficiency.
Details: Accurate boost calculation is crucial for proper supercharger sizing, engine tuning, preventing detonation, and maximizing performance while maintaining engine reliability.
Tips: Enter engine displacement in cubic inches, RPM in revolutions per minute, and supercharger efficiency as a decimal (e.g., 0.75 for 75% efficiency). All values must be positive numbers.
Q1: What is a typical supercharger efficiency range?
A: Most superchargers operate between 60-85% efficiency, with roots-type typically lower and centrifugal types typically higher.
Q2: Why is the constant 3456 used in the formula?
A: The constant 3456 converts cubic inches per minute to cubic feet per minute and accounts for standard atmospheric pressure.
Q3: How does boost pressure relate to horsepower?
A: Generally, each pound of boost increases horsepower by approximately 6-8%, but this varies based on engine efficiency and other factors.
Q4: What factors affect supercharger efficiency?
A: Supercharger design, impeller speed, temperature rise, and parasitic losses all affect overall efficiency.
Q5: Is this calculation accurate for all supercharger types?
A: The formula provides a theoretical estimate. Actual boost may vary due to intercooling, pressure drops, and real-world efficiency variations.