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Stall Speed Formula:
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The stall speed formula calculates the optimal torque converter stall speed for drag racing applications. It estimates the RPM at which the torque converter allows the engine to reach its peak torque range for maximum acceleration.
The calculator uses the stall speed formula:
Where:
Explanation: The formula provides an approximation of the ideal stall speed based on engine horsepower and a constant factor that accounts for various vehicle characteristics.
Details: Proper stall speed selection is crucial for drag racing performance. It determines how quickly the vehicle launches off the line and how effectively it transfers power to the wheels during acceleration.
Tips: Enter the appropriate K constant for your application (consult with torque converter manufacturers for recommended values) and your engine's horsepower. Both values must be positive numbers.
Q1: What is a typical K value range?
A: K values typically range from 20-30, with higher values for more aggressive racing applications and lower values for street/strip combinations.
Q2: How does stall speed affect launch performance?
A: Higher stall speeds allow the engine to rev into its power band before the car moves, resulting in harder launches but potentially less street drivability.
Q3: Should I use peak horsepower or torque horsepower?
A: Most experts recommend using the horsepower value at the RPM where peak torque occurs for stall speed calculations.
Q4: Are there other factors that affect stall speed selection?
A: Yes, vehicle weight, tire size, gearing, and transmission type all influence the ideal stall speed for optimal performance.
Q5: Can I use this calculator for street driving applications?
A: While the formula works similarly, street applications typically use lower stall speeds for better drivability and fuel economy.