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Not sure why I chime in on this one since I find the drag strip quite boring and the numbers achieved there of little interest but in my experience hp is the main factor for trap speed. The time is mainly power to weight with weight being very important since the time is a result of average speed ( as lap times on a track ) where a quick start is imperative. The 1/4 mile however is long enough for cars to reach speeds where hp becomes very important to the final trap speed and heavier cars with huge power can build impressive speeds even with a so-so launch.
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