1. What is Stall Speed?

Stall speed is the maximum engine speed at which a torque converter can hold the vehicle stationary against the brakes. It's a critical parameter in drag racing that determines how quickly a vehicle can launch from a standstill.

2. How Does the Calculator Work?

The calculator uses the stall speed formula:

Where:

• \( HP \) — Horsepower
• \( \tau \) — Torque in lb-ft
• 5252 — Conversion constant (derived from the relationship between HP and torque)

Explanation: This formula calculates the optimal stall speed for a torque converter based on the engine's horsepower and torque characteristics.

3. Importance of Stall Speed Calculation

Details: Proper stall speed selection is crucial for drag racing performance. It determines how quickly the vehicle can transfer power to the wheels at launch, affecting acceleration times and overall race performance.

4. Using the Calculator

Tips: Enter your engine's horsepower and torque values. Use peak horsepower and torque numbers for the most accurate stall speed calculation. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is stall speed important in drag racing?
A: The right stall speed allows the engine to operate in its optimal power band during launch, maximizing acceleration off the line.

Q2: What happens if my stall speed is too high or too low?
A: Too high stall speed can cause excessive wheel spin, while too low stall speed may prevent the engine from reaching its power band quickly enough.

Q3: Should I use peak horsepower or torque numbers?
A: For drag racing applications, it's best to use the horsepower and torque values at the RPM where you want the converter to flash/stall.

Q4: Does this calculation work for all types of torque converters?
A: This formula provides a general estimate. Actual stall characteristics may vary based on converter design, vehicle weight, and other factors.

Q5: How does vehicle weight affect stall speed selection?
A: Heavier vehicles typically require higher stall speeds to overcome inertia, while lighter vehicles may perform better with lower stall speeds.