1. What is the ET Equation?

The ET (Elapsed Time) equation estimates the quarter-mile time for a vehicle based on its weight and horsepower. It's commonly used in automotive performance analysis.

2. How Does the Calculator Work?

The calculator uses the ET equation:

Where:

• \( Weight \) — Vehicle weight in pounds (lbs)
• \( HP \) — Engine horsepower (HP)

Explanation: The equation shows the relationship between power-to-weight ratio and quarter-mile time, with the cube root accounting for the non-linear relationship.

3. Importance of ET Calculation

Details: ET is a key metric in drag racing and performance tuning, helping compare vehicle performance and estimate potential improvements from weight reduction or power increases.

4. Using the Calculator

Tips: Enter vehicle weight in pounds and engine horsepower. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this ET calculation?
A: It provides a theoretical estimate. Actual ET depends on traction, aerodynamics, drivetrain losses, and other factors.

Q2: Should I use curb weight or race weight?
A: For most accurate results, use the actual weight with driver and fuel (race weight).

Q3: Does this account for forced induction?
A: The equation works with the actual horsepower output, regardless of how it's produced.

Q4: What's a good ET for a street car?
A: Below 14 seconds is considered quick, with 12s being very fast, and sub-10s being extreme performance.

Q5: How can I improve my ET?
A: Either increase horsepower (engine modifications) or reduce weight (lightweight components).