1. What is Turbo Size Calculation?

The turbo size calculation helps determine the appropriate turbocharger for an engine based on its displacement, desired boost pressure, and compressor efficiency. This ensures optimal performance and prevents turbo lag or oversizing.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( Displacement \) — Engine displacement in liters
• \( Boost \) — Desired boost pressure in psi
• \( Compressor\ Efficiency \) — Compressor efficiency as a decimal (0-1)

Explanation: The equation calculates the relative turbo size needed based on how much air the engine can theoretically move and how efficiently the compressor can pressurize it.

3. Importance of Turbo Size Calculation

Details: Proper turbo sizing is crucial for achieving desired performance characteristics while maintaining reliability and drivability. An improperly sized turbo can lead to poor throttle response, excessive heat, or insufficient boost.

4. Using the Calculator

Tips: Enter engine displacement in liters, desired boost pressure in psi, and compressor efficiency as a decimal between 0 and 1. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical compressor efficiency value?
A: Most modern turbochargers have compressor efficiencies between 0.65 and 0.75 (65%-75%).

Q2: How does displacement affect turbo size?
A: Larger displacement engines generally require larger turbos to maintain the same boost pressure level.

Q3: What boost pressure is typical for street applications?
A: Street applications typically run between 6-15 psi, while race applications may go much higher.

Q4: Are there other factors to consider when selecting a turbo?
A: Yes, including turbine housing size, compressor map characteristics, and intended RPM range.

Q5: Can this calculation be used for superchargers?
A: While similar principles apply, supercharger sizing has additional considerations due to different efficiency characteristics.