Says somebody who has never used a dyno I guess! Because if you compete at a high level and or at multiple tracks and don't have the benefit of a team with huge amounts of accumalated data, or a good engine builder with a dyno, then your own Dyno is indispensable.
If you know what you're doing you can learn more about certain aspects of how your engine performs with as little as a couple of hours on a dyno than in a whole season of racing.
On the track it's relatively easy with a good consistant driver to see how the difference in, for example, pop-off or exhaust length effects your lap times, even the difference between carbs or valve clearances on a 4 stroke might have an effect. What it doesn't tell you is why and or the accumalated effect of minor changes and if you don't know that you will only be guessing what to do next time.
Obviously engine data in itself is not a complete solution and there is no substitute for track time from a drivers point of view. But knowing for a fact that you have the best possible engine next to you is the best possible start.
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