Dynamometer Error

In testing, there is always a margin of error that the tester must deal with. Usually, you take a few samples, throw out the number that's high and or low and use the remaining numbers. If we do that, are we still able to take what remains and legitimately say that we see a 2-6 horsepower increase and it isn't just dyno error.

Above is the dyno results from a 2004 Acura RSX Type-S. Stock plugs vs Pulstar plugs we saw an 8 HP peak increase and a 2 Ft-Lb peak torque increase. I took all 3 runs from the stock test and 3 from the Pulstar test and superimposed the graphs on top of each other. You can see the numbers at the bottom are skewed because of the differing results from the runs.

The grouping is very good, a definite indicator of the consistency of our dyno runs, even the 2 pound increase in peak torque can be differentiated between the two types of plugs. Most of our tests look like this. We do have some that literally superimpose each other so the 3 results printed looks like one run.

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