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The run completion calculators on this page use a series of calculations to predict ET off of the base run. 

  • First, the known variance to the last "full throttle" timer on the racetrack is determined (variance in 330FT time for 1/8 mile, variance in 1000FT time for 1/4 mile).

  • Second, an incremental variance is determined for the last "full throttle" segment of the racetrack (variance of 60FT to 330FT segment for 1/8 mile, variance of 660FT to 1000FT segment for 1/4 mile). 

  • Third, a final incremental variance is estimated for the "aborted" segment of the racetrack (330FT to 660FT for 1/8 mile, 1000FT to 1320FT for 1/4 mile). 

    • This segment is estimated by multiplying the last "full throttle" segment by a correction factor (0.85 for 1/8 mile, ​0.90 for 1/4 mile). 

      • 1/8 Mile Example: ​If the last "full throttle" segment (60FT to 330FT) variance is found to be .0050 seconds, then it is estimated that the "aborted" segment (330FT to 660FT) variance is .0043 seconds (.0050 * .85). The correction factors are used to account for the lesser amount of time the car spends within the final segment of the racetrack. On average, most cars are between the 330FT and 660FT only 85% as much time as they are between the 60FT and 330FT. Less time yields less variance, hence the reason for the correction factors. 

  • The estimated final incremental variance is then added to the known variance to the last "full throttle" timer (determined in first bullet point) to arrive at an estimated "total track variance". ​​

  • The "total track variance" is then applied to the base run ET and is shown in purple on the run completion calculator.

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