1. What is the Boost to HP Formula?

The Boost to HP formula estimates horsepower gain from forced induction (turbocharging or supercharging) based on boost pressure and naturally aspirated horsepower. It provides a simple way to estimate power gains from adding boost to an engine.

2. How Does the Calculator Work?

The calculator uses the HP Gain formula:

Where:

• \( Boost\ PSI \) — Boost pressure in pounds per square inch
• \( Base\ HP \) — Naturally aspirated horsepower
• 14.7 — Standard atmospheric pressure at sea level (psi)

Explanation: The formula calculates the percentage increase in air mass flow from boost pressure and applies it to the base horsepower.

3. Importance of HP Gain Calculation

Details: Estimating horsepower gain helps in planning forced induction systems, selecting appropriate components, and setting performance expectations.

4. Using the Calculator

Tips: Enter boost pressure in psi and base naturally aspirated horsepower. All values must be valid (positive numbers).

5. Frequently Asked Questions (FAQ)

Q1: Is this formula accurate for all engines?
A: This provides a rough estimate. Actual gains depend on many factors including engine efficiency, intercooling, and fuel quality.

Q2: Why is 14.7 used in the formula?
A: 14.7 psi represents standard atmospheric pressure at sea level, serving as the reference point for boost pressure.

Q3: Does this account for turbo lag or efficiency losses?
A: No, this is a theoretical maximum. Real-world gains are typically 10-20% lower due to various inefficiencies.

Q4: Can I use this for superchargers?
A: Yes, the formula works for both turbochargers and superchargers, though actual results may vary.

Q5: What about higher boost levels?
A: At very high boost levels (20+ psi), the relationship becomes less linear and additional factors must be considered.