1. What is the Stall Speed Formula?

The stall speed formula calculates the optimal stall speed for a torque converter based on engine horsepower and a specific constant value. This helps determine the best torque converter for your vehicle's performance needs.

2. How Does the Calculator Work?

The calculator uses the stall speed formula:

Where:

• \( Stall \) — Stall speed in RPM
• \( K \) — Constant value (typically ranges from 15-25)
• \( HP \) — Engine horsepower

Explanation: The formula calculates the ideal stall speed where the torque converter will most efficiently transfer power from the engine to the transmission.

3. Importance of Stall Speed Calculation

Details: Proper stall speed selection is crucial for optimal vehicle performance. Too low a stall speed can bog the engine down, while too high can reduce efficiency and cause overheating.

4. Using the Calculator

Tips: Enter the appropriate K constant value (consult your torque converter manufacturer) and your engine's horsepower. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value range?
A: K values typically range from 15-25, with street performance applications around 18-20 and racing applications using higher values.

Q2: How does stall speed affect performance?
A: Higher stall speeds allow the engine to reach its power band faster, improving acceleration but may reduce fuel efficiency at cruising speeds.

Q3: What factors influence the K constant?
A: Vehicle weight, transmission type, rear gear ratio, and intended use (street, strip, towing) all influence the optimal K value.

Q4: Can I use this for any vehicle?
A: This formula works for most automatic transmission vehicles, but always consult with your torque converter manufacturer for specific recommendations.

Q5: What if my calculated stall seems too high?
A: Re-check your K value and horsepower input. Very high stall speeds may not be suitable for street driving and could cause overheating issues.