Drag Race Calculators

Drag Race ET Formula:

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

Estimated ET (Time):

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1. What is the Drag Race ET Formula?

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

2. How Does the Calculator Work?

The calculator uses the drag race ET formula:

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

Where:

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

Explanation: The formula calculates the theoretical quarter-mile 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: ET calculation helps racers estimate vehicle performance, compare different setups, and understand how weight and power changes affect quarter-mile times. It's useful for tuning and performance planning.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this ET formula?
A: This provides a theoretical estimation. Actual ET can vary based on traction, aerodynamics, driver skill, and track conditions.

Q2: What is a typical constant value?
A: The constant typically ranges from 5.7 to 5.9, with 5.825 being a common average value for many vehicles.

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

Q4: How does weight affect ET?
A: Increased weight generally increases ET (slower times), while reduced weight decreases ET (faster times), assuming horsepower remains constant.

Q5: Can I use this for other race distances?
A: This formula is specifically designed for quarter-mile (1320 feet) drag racing. Different distances would require different formulas.