1. What is the Wallace Racing ET Equation?

The Wallace Racing ET (Elapsed Time) equation estimates quarter-mile drag racing elapsed time based on vehicle weight and horsepower. It provides a theoretical performance benchmark for drag racing vehicles.

2. How Does the Calculator Work?

The calculator uses the Wallace Racing ET equation:

Where:

• \( ET \) — Quarter-mile elapsed time (seconds)
• \( Weight \) — Vehicle weight (pounds)
• \( HP \) — Engine horsepower

Explanation: The equation calculates theoretical quarter-mile performance based on the power-to-weight ratio, with the cube root relationship accounting for the non-linear nature of acceleration.

3. Importance of ET Calculation

Details: ET calculation helps racers estimate vehicle performance, compare different setups, and set realistic performance goals. It's widely used in drag racing for performance prediction and tuning.

4. Using the Calculator

Tips: Enter vehicle weight in pounds and engine horsepower. Use actual measured horsepower for best accuracy. All values must be valid (weight > 0, HP > 0).

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the Wallace Racing ET calculator?
A: It provides a theoretical estimate. Actual ET can vary due to traction, aerodynamics, transmission efficiency, and driver skill.

Q2: What is considered a good quarter-mile ET?
A: Below 12 seconds is very fast for street cars, 10-11 seconds is professional level, and sub-10 seconds is elite racing territory.

Q3: Should I use wheel horsepower or engine horsepower?
A: For most accuracy, use rear wheel horsepower as this accounts for drivetrain losses (typically 15-20% less than engine HP).

Q4: Does this account for driver weight?
A: No, the calculator uses vehicle weight only. For total weight, add driver and passenger weights to the vehicle weight.

Q5: Can I use this for different racing distances?
A: This equation is specifically calibrated for quarter-mile (1320 feet/402 meters) drag racing.