1. What is the Stall Speed Formula?

The stall speed formula calculates the optimal torque converter stall speed for drag racing applications. It helps determine the RPM at which the torque converter allows the engine to reach its peak power band for maximum acceleration.

2. How Does the Calculator Work?

The calculator uses the stall speed formula:

Where:

• \( K \) — Constant factor (typically ranges from 20-30 for most applications)
• \( HP \) — Engine horsepower (hp)
• \( \text{Stall} \) — Calculated stall speed (rpm)

Explanation: The formula provides an estimate of the ideal stall speed based on the square root of horsepower multiplied by an application-specific constant.

3. Importance of Stall Speed Calculation

Details: Proper stall speed selection is crucial for drag racing performance. It determines how quickly the vehicle launches and how effectively it transfers power to the wheels during acceleration.

4. Using the Calculator

Tips: Enter the appropriate constant value (K) for your application and the engine's horsepower. Typical K values range from 20-30 depending on vehicle weight, transmission type, and racing class.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value range?
A: Most drag racing applications use K values between 20-30. Lighter vehicles and higher horsepower applications may use lower values.

Q2: How does vehicle weight affect stall speed?
A: Heavier vehicles generally require higher stall speeds to overcome inertia and achieve optimal launch characteristics.

Q3: When should I use a higher stall converter?
A: Higher stall converters are beneficial for engines with power bands that peak at higher RPMs, allowing the engine to stay in its optimal power range.

Q4: Are there limitations to this formula?
A: This formula provides an estimate. Actual optimal stall speed may vary based on transmission type, rear gear ratio, tire size, and track conditions.

Q5: Should I consult a professional for converter selection?
A: For competitive racing, consulting with a torque converter specialist is recommended to match the converter to your specific combination.