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Stall Speed Formula:
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Stall speed is the maximum engine speed at which a torque converter can multiply torque when the output shaft is prevented from rotating. It's a critical parameter in automatic transmission performance tuning.
The calculator uses the stall speed estimation formula:
Where:
Explanation: This formula provides an estimation of torque converter stall speed based on the vehicle's power-to-weight ratio and a correction factor.
Details: Proper stall speed selection is crucial for optimizing acceleration, towing performance, and overall drivability. It affects how quickly the vehicle launches and how well it performs in various driving conditions.
Tips: Enter engine horsepower in HP, vehicle weight in pounds, and select an appropriate K constant. Typical K values range from 0.8 for street applications to 1.2 for performance applications.
Q1: What is a typical K constant value?
A: For most street applications, K ranges from 0.8 to 1.0. For performance applications, it may be 1.0 to 1.2.
Q2: How accurate is this estimation?
A: This provides a rough estimation. Actual stall speed depends on many factors including torque converter design, engine torque curve, and transmission gearing.
Q3: What happens if stall speed is too high?
A: Excessive stall speed can cause poor fuel economy, increased heat generation, and reduced drivability at low speeds.
Q4: What happens if stall speed is too low?
A: Insufficient stall speed can result in poor acceleration, especially from a stop, and may cause the engine to stall when the brakes are applied.
Q5: Should I consult a professional for torque converter selection?
A: Yes, for optimal performance it's recommended to consult with a transmission specialist who can consider all factors including your specific driving needs and vehicle configuration.