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Torque Converter Stall Speed Formula:
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The torque converter stall speed calculation estimates the RPM at which the torque converter allows the engine to reach its peak torque multiplication. This is a critical parameter for drag racing performance tuning and transmission setup.
The calculator uses the stall speed formula:
Where:
Explanation: The formula calculates the approximate stall speed by taking the square root of the power-to-weight ratio and multiplying by a converter-specific K factor.
Details: Proper stall speed selection is crucial for drag racing performance. It determines how quickly the vehicle launches and how effectively the engine operates within its power band during acceleration.
Tips: Enter accurate horsepower and weight values. The K factor typically ranges from 2000-3000 for most performance torque converters. Consult your converter manufacturer for the specific K value.
Q1: What is stall speed in a torque converter?
A: Stall speed is the maximum RPM the engine can reach with the transmission in gear and the brakes applied before the vehicle begins to move.
Q2: How does stall speed affect drag racing performance?
A: Higher stall speeds allow the engine to operate in its peak power band during launch, resulting in better acceleration and quicker ETs.
Q3: What is a typical K factor range?
A: K factors typically range from 2000-3000, with higher values indicating higher stall characteristics. Street performance converters are usually 2000-2400, while race converters can be 2500-3000+.
Q4: Can I use this calculator for automatic transmission street cars?
A: Yes, but remember that street driving requires a balance between performance and drivability. Very high stall speeds can make street driving less comfortable.
Q5: How accurate is this calculation?
A: This provides a good estimate, but actual stall speed can vary based on torque converter design, engine torque curve, and other factors. Always verify with actual testing.