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Quarter Mile to Eighth Mile Conversion:
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The quarter mile to eighth mile ET (Elapsed Time) conversion is used in drag racing to estimate eighth mile times from quarter mile times using a standard conversion factor of 1.554.
The calculator uses the conversion formula:
Where:
Explanation: This formula provides a quick estimation of eighth mile performance based on known quarter mile times, useful for tracks that only run one distance.
Details: Accurate ET conversion helps racers compare performance across different track lengths, plan racing strategies, and estimate vehicle performance on tracks with varying distances.
Tips: Enter your quarter mile elapsed time in seconds. The value must be greater than 0. The calculator will provide the estimated eighth mile time.
Q1: How accurate is the 1.554 conversion factor?
A: The 1.554 factor is a general approximation that works well for most vehicles, but actual ratios can vary based on vehicle type, power delivery, and launch characteristics.
Q2: Does this work for all types of vehicles?
A: While generally applicable, the conversion may be less accurate for vehicles with unusual power bands or those that are traction-limited in the first half of the run.
Q3: Can I use eighth mile time to estimate quarter mile?
A: Yes, you can reverse the calculation: Quarter Mile ET = Eighth Mile ET × 1.554.
Q4: Why do tracks have different lengths?
A: Some tracks are built for eighth mile racing due to space constraints, while traditional drag strips are quarter mile. The conversion helps standardize comparisons.
Q5: Are there other conversion factors used?
A: Some racers use slightly different factors (1.55-1.57) based on vehicle type and track conditions, but 1.554 is the most commonly accepted standard.