1. What is the Stall Speed Equation?

The stall speed equation estimates torque converter stall speed, which is the maximum RPM the engine can reach when the transmission is in gear and the vehicle is prevented from moving. This is an important parameter in automotive performance tuning.

2. How Does the Calculator Work?

The calculator uses the stall speed equation:

Where:

• \( HP \) — Horsepower of the engine
• \( Weight \) — Vehicle weight in pounds
• \( K \) — Dimensionless constant (typically between 2000-3000)

Explanation: The equation estimates the RPM at which the torque converter will stall based on the vehicle's power-to-weight ratio and a constant factor.

3. Importance of Stall Speed Calculation

Details: Proper stall speed selection is crucial for optimal vehicle performance. A correctly matched torque converter improves acceleration, towing capability, and overall drivability.

4. Using the Calculator

Tips: Enter accurate horsepower and weight values. The K constant varies based on torque converter design - consult manufacturer specifications for appropriate values.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value range?
A: K values typically range from 2000 to 3000, with higher values for performance applications and lower values for street vehicles.

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

Q3: Should I use wheel horsepower or engine horsepower?
A: For most accurate results, use engine horsepower at the flywheel rather than wheel horsepower.

Q4: What weight should I use in the calculation?
A: Use the vehicle's curb weight plus any additional weight from passengers, cargo, or modifications.

Q5: Are there limitations to this equation?
A: This is an estimation formula. Actual stall speed can vary based on torque converter design, engine torque characteristics, and other factors.