Enter your Engine Horsepower, Vehicle Weight, Fuel Type, Primary Usage, Transmission Manufacturer, First Gear Ratio, and Rear Gear Ratio to get your Recommended Stall Speed, Stall Speed Range, and Converter Slip Percentage.
Recommended Stall Speed
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Stall Speed Range (Low)
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Stall Speed Range (High)
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Converter Slip Percentage
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A torque converter connects the engine to the transmission in automatic transmissions, transferring power through hydraulic fluid while allowing the engine to continue running when the vehicle is stopped.
The ideal stall speed depends on your engine's power band, vehicle weight, transmission gearing, and intended use. Street cars typically need 2000-2800 RPM stall, while drag racing applications may need 3000-5000+ RPM stall.
Flash stall is the RPM the converter reaches under full throttle acceleration from a stop. Foot-brake stall is the RPM reached when holding the brakes and applying full throttle, typically 200-400 RPM lower than flash stall.
Heavier vehicles need lower stall speeds to get moving efficiently, while lighter vehicles can benefit from higher stall speeds to keep the engine in its power band during acceleration.
A stall speed that's too high will cause poor fuel economy, excessive heat generation, sluggish low-speed performance, and potential transmission damage from overheating.
A stall speed that's too low may cause the engine to bog down during acceleration, poor performance off the line, and inability to properly utilize the engine's power band.
Yes, drag racing typically requires higher stall speeds (3000-5000+ RPM) to launch at peak torque, while street driving needs lower stall speeds (2000-2800 RPM) for fuel economy and drivability.
Lower (numerically higher) first gear ratios and rear axle ratios allow for higher stall speeds, while higher (numerically lower) gear ratios typically require lower stall speeds for optimal performance.