1. What is the 1/8 to 1/4 Mile ET Conversion?

Definition: This calculator converts 1/8-mile elapsed time (ET) to estimated 1/4-mile ET using Wallace Racing's standard conversion factor.

Purpose: It helps drag racers estimate quarter-mile performance based on eighth-mile times when only a shorter track is available.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( ET_{1/4} \) — Estimated quarter-mile elapsed time (seconds)
• \( ET_{1/8} \) — Measured eighth-mile elapsed time (seconds)
• 1.45 — Standard conversion factor (Wallace Racing)

Explanation: The eighth-mile time is multiplied by 1.45 to estimate the quarter-mile time based on typical acceleration curves.

3. Importance of ET Conversion

Details: This conversion allows racers to compare performance across different track lengths and estimate quarter-mile times without access to a full-length drag strip.

4. Using the Calculator

Tips: Enter your measured 1/8-mile elapsed time in seconds. The value must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this conversion?
A: The 1.45 multiplier is a general rule that works well for most street cars and mild race cars. Highly modified or non-typical vehicles may vary.

Q2: Does this work for all types of vehicles?
A: It works best for typical drag cars and street vehicles. Top fuel dragsters and motorcycles may have different conversion factors.

Q3: Can I use this to convert 1/4-mile to 1/8-mile?
A: Yes, by dividing the 1/4-mile time by 1.45 to estimate the 1/8-mile time.

Q4: Why 1.45 specifically?
A: This factor comes from Wallace Racing's extensive drag racing data and represents the average acceleration curve for most vehicles.

Q5: Should I use this for official timing?
A: No, this is for estimation only. Always use actual measured times for official purposes.