1. What is Torque Converter Stall Speed?

Stall speed is the maximum engine RPM that can be achieved in an automatic transmission vehicle when the transmission is in gear and the brakes are fully applied. It represents the point where the torque converter transfers maximum torque to the transmission.

2. How Does the Calculator Work?

The calculator uses the stall speed formula:

Where:

• \( Stall \) — Stall speed in RPM
• \( K \) — Torque converter constant (typically 25-35 for street applications)
• \( HP \) — Engine horsepower

Explanation: The formula calculates the optimal stall speed based on engine horsepower and torque converter characteristics. The constant K varies depending on torque converter design and application.

3. Importance of Stall Speed Calculation

Details: Proper stall speed selection is crucial for optimal vehicle performance. Too low stall speed reduces acceleration, while too high stall speed decreases fuel efficiency and creates excessive heat.

4. Using the Calculator

Tips: Enter the torque converter constant (K) and engine horsepower. Typical K values range from 25 for mild street applications to 35+ for performance applications.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value for street applications?
A: For most street vehicles, K values typically range from 25-30 depending on transmission type and vehicle weight.

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

Q3: Can I use this calculator for any vehicle?
A: This calculator is primarily designed for automatic transmission vehicles with torque converters. Manual transmissions do not have stall speed.

Q4: What factors influence the K constant?
A: The K constant is influenced by torque converter design, stator characteristics, and internal hydraulic properties.

Q5: How accurate is this calculation?
A: This provides a good estimate, but actual stall speed may vary based on torque converter quality, engine torque curve, and other factors.