1. What is a Torque Converter Stall Speed Calculator?

Definition: This calculator estimates the optimal torque converter stall speed for drag racing applications based on your engine's torque characteristics and vehicle specifications.

Purpose: Helps racers select the proper torque converter for maximum launch performance without excessive slippage.

2. How Does the Calculator Work?

The calculator uses empirical data and rules of thumb from professional racing:

Key Factors:

• Engine RPM at Peak Torque: Base stall speed is typically 90% of peak torque RPM
• Vehicle Type: More aggressive racing applications require higher stall speeds
• Vehicle Weight: Heavier vehicles generally benefit from slightly higher stall

3. Importance of Proper Stall Speed

Details: Correct stall speed matches your engine's power band to:

• Maximize launch acceleration
• Minimize power loss through the converter
• Prevent excessive heat buildup
• Maintain street driveability (if applicable)

4. Using the Calculator

Tips:

• Enter your engine's RPM at peak torque (from dyno sheet)
• Select your vehicle's primary use case
• Enter actual race weight (with driver)
• Results are estimates - consult with converter manufacturers for final selection

5. Frequently Asked Questions (FAQ)

Q1: What exactly is stall speed?
A: The maximum RPM the engine can reach with the brakes fully applied and transmission in gear before the tires break loose.

Q2: How accurate is this calculator?
A: It provides a good starting point, but final selection should consider cam profile, rear gear ratio, and tire size.

Q3: What if I don't know my peak torque RPM?
A: Estimate as 500-800 RPM below your power peak, or use our Engine Power Band Calculator.

Q4: Can I use this for street cars?
A: Yes, but select "Street/Strip" option for more driveable recommendations.

Q5: What about nitrous or forced induction?
A: These typically require higher stall speeds - add 200-400 RPM to the calculated value.