How to Interpret Dyno Results


Understanding the results of a dyno test on your motorcycle or car is important to learning how you can increase its performance and where particular "holes" are in the horsepower and torque curves of the vehicle in question. According to WordIQ, a dyno test plots the horsepower and torque of a vehicle at peak levels over time. Horsepower and torque are generally supposed to increase to a peak during a dyno test, however a dyno chart with numerous peaks indicates holes in the "powerband" of the vehicle and should be examined in order to assist in eliminating the holes.

Things You'll Need

  • Dynamometer
  • Software program to interpret results
  • Observe the general overview of the graph. The left side should have two sets of numbers (horsepower and torque) while the bottom of the graph will be rounds per minute (RPM) ranges of the engine.

  • Locate the peak horsepower and torque along the respective curves. These are the areas of greatest power in your engine's RPM range. When further tuning the engine, attempt to increase power first in this RPM range and then move on to any holes that are identified in the power curves.

  • Examine the two different lines, Horsepower and Torque, to observe how they are behaving as the engine RPM increases. Flat sections of horsepower indicate that the torque of that section of the RPM band is dropping off, which should be seen by a downward slope in the torque curve.

  • Highlight any sections of the torque curve that decrease. Flat sections of torque should be fine as the horsepower curve should continue to increase, the only places of concern for the torque curve are the downward slopes.

  • Highlight any areas of decreased horsepower and examine the torque curve in this section as well. Areas of low torque, low horsepower, but increasing RPM should point out a hole in the power curve, which can then be shown to a performance shop so they can assist you in closing those holes.

Tips & Warnings

  • Dyno tests are very stressful on engines and running numerous dynos could result in failure of some of the car's systems. It is best to only run a dyno test when you are fairly sure there is a significant change in horsepower or torque from the last run.

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