Drag Time Calculator Drag Race

Drag Time Equation:

\[ ET = \sqrt{ \frac{WT}{HP} \times constant } \]

Elapsed Time (ET):

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1. What is the Drag Time Equation?

The Drag Time Equation estimates elapsed time (ET) for a drag race based on vehicle weight, horsepower, and an empirical constant. It provides a theoretical estimation of quarter-mile performance for drag racing vehicles.

2. How Does the Calculator Work?

The calculator uses the Drag Time equation:

\[ ET = \sqrt{ \frac{WT}{HP} \times constant } \]

Where:

\( ET \) — Elapsed Time (seconds)
\( WT \) — Vehicle Weight (pounds)
\( HP \) — Horsepower (HP)
\( constant \) — Empirical constant (typically around 5.825)

Explanation: The equation calculates the theoretical quarter-mile elapsed time based on the power-to-weight ratio of the vehicle, adjusted by an empirical constant that accounts for various factors affecting drag racing performance.

3. Importance of ET Calculation

Details: Accurate ET estimation is crucial for drag racing enthusiasts and professionals to predict vehicle performance, compare different setups, and optimize vehicle configuration for better quarter-mile times.

4. Using the Calculator

Tips: Enter vehicle weight in pounds, horsepower, and the empirical constant (default is 5.825). All values must be valid positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical constant value for this equation?
A: The constant typically ranges from 5.7 to 5.9, with 5.825 being a commonly used value for many vehicles.

Q2: How accurate is this calculation?
A: This provides a theoretical estimation. Actual ET can vary based on traction, aerodynamics, transmission efficiency, and driver skill.

Q3: Does this work for all types of vehicles?
A: The equation works best for rear-wheel drive vehicles with good traction. Front-wheel drive and all-wheel drive vehicles may require different constants.

Q4: Should I use curb weight or race weight?
A: For most accurate results, use the vehicle's race weight which includes driver, fuel, and all equipment.

Q5: How does altitude affect the calculation?
A: Higher altitudes reduce engine power. For accurate results at altitude, use corrected horsepower values rather than sea-level ratings.