Hub Dyno vs Roller Dyno

The good the bad and the stuff no one cares about.

What Dyno type is best for your needs? This is always a question among most automotive enthusiast, but whats the answer? In most instances you don’t have very many options based on your geographical location and what the local shops have. If you have the perk of being around multiple types of dynos get ready to start making decisions or just spend your paycheck on every option available. Lets go over what options are still even used……

Chassis dyno, Inertia dyno, Hydraulic dynos, Engine dyno, Brake dyno, Eddy current dyno, Pto dyno, and Spring dyno’s. You will only see about 4 of these different types being used these days which are the Engine, Inertia, Chassis, and Eddy current, these have about 3 different ways of applying the load to the car/engine. Lets talk about the simple one which is Inertia……. Have you ever tried to walk on barrel like a rodeo clown? This is pretty much what inertia type dynos do, they ave a weighted roller the car moves and the computer calculates how fast the car can increase the rotation of the (specific weight) roller. These work great for most cars when the HP level is moderate as the weight needs to be increased as the HP level is increased to get a more accurate measurement.

Engine dynos, we are gonna skip these because they are specifically attached to the engine and use a fluid in most cases to create load. Used a lot for parts testing.

Today’s chassis dynos fit into one of three broad categories: inertia dynos, water-brake or hydraulic dynos, and electric dynos. The type of dyno affects test results and also the type of test that can be run. A pure inertia dyno can only do full-throttle acceleration runs, but the best modern load-bearing hydraulic and electric dynos with sophisticated control software can do step-tests, constant-speed pulls, and even part-throttle testing to the point that full vehicle road-load simulations can be conducted right on the dyno.

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