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ET Equation:
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The ET (Elapsed Time) equation estimates the time it takes for a drag racing vehicle to complete a quarter-mile run based on its weight and horsepower. This formula provides a theoretical estimation of performance potential.
The calculator uses the ET equation:
Where:
Explanation: The equation shows that elapsed time is proportional to the cube root of the weight-to-power ratio, indicating the significant impact of power-to-weight ratio on acceleration performance.
Details: Accurate ET estimation is crucial for drag racers to predict vehicle performance, compare different setups, and optimize power-to-weight ratios for competitive racing.
Tips: Enter vehicle weight in pounds and engine horsepower. Both values must be positive numbers. The calculator provides an estimated quarter-mile elapsed time in seconds.
Q1: How accurate is this ET estimation?
A: This provides a theoretical estimation. Actual ET can vary based on traction, aerodynamics, transmission efficiency, and driver skill.
Q2: What is considered a good ET for drag racing?
A: Professional drag cars can achieve ETs under 4 seconds, while street-legal performance cars typically range from 11-14 seconds. Under 10 seconds is considered excellent performance.
Q3: Does this equation account for different racing classes?
A: This is a general estimation formula. Different racing classes and vehicle types may require specific modifications to the calculation.
Q4: What other factors affect ET besides weight and horsepower?
A: Traction, aerodynamics, gear ratios, tire compound, track conditions, and weather all significantly impact actual elapsed times.
Q5: Can this calculator be used for different race distances?
A: This specific equation is calibrated for quarter-mile (1320 feet) drag racing. Different constants would be needed for other distances.