Home
Back
HP to Weight Ratio ET Equation:
| From: | To: |
The HP to Weight Ratio ET Calculator estimates the elapsed time (ET) for a vehicle based on its horsepower to weight ratio. This calculation is commonly used in automotive performance analysis to predict quarter-mile times and overall vehicle acceleration performance.
The calculator uses the HP to Weight Ratio ET equation:
Where:
Explanation: The equation calculates the cube root of the horsepower to weight ratio and divides 1353 by this value to estimate the quarter-mile elapsed time. This provides a theoretical performance benchmark for vehicles.
Details: Accurate ET estimation is crucial for performance vehicle tuning, drag racing predictions, and comparing vehicle acceleration capabilities. It helps racers and enthusiasts understand how power-to-weight ratios affect quarter-mile times.
Tips: Enter horsepower and weight in pounds. Both values must be positive numbers. The calculator will compute the estimated quarter-mile time in seconds based on the power-to-weight ratio.
Q1: What does ET represent in this context?
A: ET stands for Elapsed Time and typically refers to quarter-mile drag strip times, measured in seconds from start to finish.
Q2: How accurate is this calculation?
A: This provides a theoretical estimate. Actual ET depends on traction, aerodynamics, transmission, driver skill, and other factors not accounted for in this simple formula.
Q3: What is a good HP to weight ratio?
A: Generally, ratios above 0.1 HP/lb (10 HP per 100 lb) indicate strong performance, while ratios below 0.05 HP/lb suggest slower acceleration.
Q4: Can this be used for different racing distances?
A: This formula is specifically calibrated for quarter-mile distances. Other distances would require different formulas or adjustments.
Q5: Why use the cube root in the formula?
A: The cube root relationship accounts for the non-linear relationship between power-to-weight ratio and acceleration time, reflecting how additional power has diminishing returns on ET improvement.