1. What is Quarter Mile to Eighth Mile Conversion?

Definition: This calculator converts quarter-mile elapsed time (ET) to eighth-mile elapsed time for drag racing applications.

Purpose: It helps drag racers and performance enthusiasts estimate eighth-mile times based on known quarter-mile times.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( ET_{\frac{1}{8}} \) — Eighth-mile elapsed time (seconds)
• \( ET_{\frac{1}{4}} \) — Quarter-mile elapsed time (seconds)

Explanation: The quarter-mile time is divided by 1.45, which is the average conversion factor observed in drag racing.

3. Importance of Quarter to Eighth Mile Conversion

Details: Many drag strips are only 1/8 mile long, making this conversion useful for comparing performance across different track lengths.

4. Using the Calculator

Tips: Enter your quarter-mile elapsed time in seconds. The value must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the 1.45 conversion factor?
A: It's an average value that works well for most vehicles, but actual ratios can vary between 1.40-1.50 depending on vehicle characteristics.

Q2: Does this work for both bracket and heads-up racing?
A: Yes, the conversion is generally applicable to all types of drag racing vehicles.

Q3: Why is the ratio not exactly 2:1 for half the distance?
A: Vehicles accelerate faster in the first half of the track due to decreasing acceleration as speed increases (drag forces).

Q4: Can I use this to predict quarter-mile times from eighth-mile?
A: Yes, you can reverse the calculation by multiplying eighth-mile time by 1.45.

Q5: Does this account for different vehicle types (FWD, RWD, AWD)?
A: The 1.45 factor is an average that works reasonably well for all drivetrain types.