1. What is the Power Speed Calculator?

The Power Speed Calculator estimates vehicle speed for a given distance based on elapsed time (ET). While commonly used for 1/4 mile drag racing, it can calculate speed for any race distance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( ET \) — Elapsed time in seconds
• \( Distance \) — Race distance in miles

Explanation: The formula accounts for the relationship between time and speed over a fixed distance, with the exponent (0.333) approximating the acceleration profile of typical vehicles.

3. Importance of Speed Calculation

Details: Accurate speed estimation is crucial for performance analysis, vehicle tuning, and comparing different runs or vehicles.

4. Using the Calculator

Tips: Enter elapsed time in seconds and distance in miles. For standard 1/4 mile runs, use 0.25 as the distance. All values must be valid (ET > 0, distance > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is the distance typically fixed at 1/4 mile?
A: 1/4 mile (402 meters) is the standard distance for drag racing in North America, allowing for consistent performance comparisons.

Q2: How accurate is this calculation?
A: It provides a good estimate for most vehicles, but actual speed may vary based on traction, aerodynamics, and power delivery.

Q3: Can I use this for other distances?
A: Yes, the formula works for any distance, though it's most accurate for short-distance acceleration tests (1/8 mile to 1/4 mile).

Q4: What affects ET and speed?
A: Factors include vehicle power, weight, traction, aerodynamics, and driver skill.

Q5: What's a good 1/4 mile time?
A: Production cars typically range 12-15 seconds. Professional dragsters can achieve under 4 seconds.