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Only the timeslips matter.

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Well yes and no...if you have a certain amount of power from dyno testing, you have data!
Now you take that, and then compare to the track data....yes it can be a dyno that is generous, but if you start looking at the WHY this and that you may discover problems or areas that need attention.

I agree if mph is low, there's a power issue possibly but WHAT is the issue? Not enough fuel delivery, spark, what changed from the dyno???
Type of fuel, timing, jetting, spacers?

Is the converter garbage allowing 500 or more rpm through the traps than should be? There should be alot of data to look through and compare with other racers to maybe find the problems if there are any.
Just my observation I guess...