Horsepower & Torque
Horsepower from Torque
HP = (Torque × RPM) ÷ 5252
Torque from Horsepower
Torque = (HP × 5252) ÷ RPM
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Understanding Horsepower & Torque
Horsepower and torque describe different aspects of an engine's output. Torque is the rotational force produced, while Horsepower is the rate at which work is performed.
The Magic Number: 5252
James Watt defined 1 horsepower as 33,000 ft-lbs of work per minute. Under rotational motion, dividing by 2π (6.28318) yields the mathematical constant **5,252.11...** At exactly 5252 RPM, torque and horsepower curves always cross and are equal!
Benefits:
- • Optimize performance modifications
- • Evaluate mechanical capabilities
- • Map transmission tuning shift points
Key Considerations:
- • Torque controls low RPM pull
- • HP defines high-speed acceleration
- • Measure either engine or wheel dyno output