The programmer was saying I was running 16.1. Then I went to the drag strip and the best I could get was 17. There are many small errors that when put together throw off the entire calculation.
Also if you run with the truck stock and then programmed you'll probably have different times from different tire sizes and such. The programmer can only assume how fast you are going from what you say the tire size (and no single tire size is correct all the time) and gear ratio are. Like I said, many small factors build exponentially and throw it off.
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