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Stall Speed Formula:
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Stall speed is the maximum engine speed at which a torque converter can hold the vehicle stationary against the brakes while the transmission is in gear. It's a critical parameter for performance vehicles and determines how quickly a vehicle can accelerate from a stop.
The calculator uses the approximate formula:
Where:
Explanation: This formula provides an approximate stall speed based on the power-to-weight ratio of the vehicle, scaled by a constant factor that accounts for torque converter design characteristics.
Details: Proper stall speed selection is crucial for optimal vehicle performance. A correctly sized torque converter improves acceleration, towing capability, and overall drivability by matching the engine's power band to the vehicle's characteristics.
Tips: Enter accurate horsepower and weight values. The K constant typically ranges from 0.8 to 1.2, with higher values for performance applications. Consult with a torque converter specialist for precise K value selection.
Q1: What is a typical K value range?
A: K values typically range from 0.8 for mild street applications to 1.2 for high-performance racing applications.
Q2: How accurate is this calculation?
A: This provides an approximate estimate. Actual stall speed can vary based on torque converter design, engine torque characteristics, and other factors.
Q3: What happens if stall speed is too high or too low?
A: Too high stall speed can cause excessive slippage and heat buildup, while too low stall speed can limit acceleration performance and cause engine bogging.
Q4: Should I consider engine torque in stall speed selection?
A: Yes, engines with higher low-end torque typically work better with lower stall speeds, while engines with power at higher RPMs benefit from higher stall speeds.
Q5: Can I use this calculator for diesel engines?
A: This formula works best for gasoline engines. Diesel engines with different torque characteristics may require adjustment of the K value.