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Stall Speed Formula:
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The racing torque converter stall formula calculates the stall speed of a torque converter based on engine horsepower and a specific constant factor. Stall speed is the maximum RPM the engine can reach when the transmission output is prevented from rotating.
The calculator uses the stall speed formula:
Where:
Explanation: The formula provides an estimate of the torque converter's stall speed based on the square root relationship with engine horsepower and a manufacturer-specific constant.
Details: Proper stall speed selection is crucial for optimal racing performance. It affects launch characteristics, power band utilization, and overall vehicle acceleration. A correctly matched stall speed ensures the engine operates in its optimal power range during acceleration.
Tips: Enter the K constant (provided by the torque converter manufacturer) and your engine's horsepower. Both values must be positive numbers. The calculator will provide the estimated stall speed in RPM.
Q1: What is a typical K value for racing torque converters?
A: K values typically range from 20-30 for performance applications, with higher values indicating higher stall speeds for the same horsepower.
Q2: How does stall speed affect racing performance?
A: Higher stall speeds allow the engine to reach its power band quicker off the line, improving acceleration but may reduce efficiency at cruise speeds.
Q3: Can I use this calculator for street applications?
A: While the formula works, street converters typically have lower K values (15-25) for better driveability and fuel efficiency.
Q4: What factors influence the K constant?
A: The K constant is determined by torque converter design including stator angle, fin count, and internal clearances set by the manufacturer.
Q5: Should I always choose the highest stall speed?
A: No, stall speed should match your engine's torque curve and intended use. Too high can cause excessive heat and poor street manners.