1. What Is The Torque Conversion Stall Formula?

The torque converter stall speed formula estimates the approximate RPM at which a torque converter will "stall" or transfer maximum torque multiplication. This is a key parameter in automotive performance applications.

2. How Does The Calculator Work?

The calculator uses the stall speed formula:

Where:

• \( K \) — K-factor (rpm/√lb-ft), a characteristic of the torque converter
• \( Torque \) — Engine torque in pound-feet (lb-ft)

Explanation: The formula provides an approximation of stall speed based on the square root relationship between torque and the converter's K-factor.

3. Importance Of Stall Speed Calculation

Details: Proper stall speed selection is crucial for optimizing vehicle launch characteristics, especially in performance and racing applications where torque multiplication at specific RPM ranges is critical.

4. Using The Calculator

Tips: Enter the torque converter's K-factor (typically provided by the manufacturer) and the engine's torque output. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K-factor range?
A: K-factors typically range from 10-25 rpm/√lb-ft for street applications, with higher values for performance converters.

Q2: How accurate is this approximation?
A: This provides a good estimate, but actual stall speed can vary based on converter design, fluid characteristics, and other factors.

Q3: Should I use peak torque or torque at a specific RPM?
A: For most applications, use peak torque value for a conservative estimate of stall speed.

Q4: Does this work for all torque converters?
A: This formula works best for traditional hydraulic torque converters. Electronic or locking converters may have different characteristics.

Q5: How does stall speed affect vehicle performance?
A: Higher stall speeds allow the engine to reach its power band quicker off the line, improving acceleration at the expense of fuel economy and street manners.