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Why is a loading dyno (Dyno Dynamics) better than an inertia dyno (dynojet)? - Loading dynos are better than inertia dynos for a number of reasons.
A) Steady State Tuning
B) More precise measurement
C) Load can be controlled
STEADY STATE TUNING
Steady state tuning is the highlight of the loading dyno. Because the loading dyno uses an electric brake to keep the rollers from accelerating it is able to precisely vary how much load is placed on the cars engine. When the dyno exerts as much load on the engine as the engine is putting out, the rollers will stop accelerating and hold a constant speed. Because the engine is not accelerating we call this a steady state. During this time the dyno is measuring the load between the brake and the car and outputs a live power number. This is very useful for tuners because it allows them to make changes to each part of the ignition/fuel map and monitor the power gains or losses in real time. With an inertia dyno there is no way to keep the rollers from accelerating and therefore no way to hold a steady state. The engine simply accelerates through the ignition/fuel maps too quickly.
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