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I know it measures stuff like HP and torque vs. RPM, but how does it work exactly.

Also, anyone know a good, reputable dyno test location in the Wash DC area that won't rip me off.
 

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Dynojet makes one of the most popular chassis dynos. It has a rolling wheel that the car drives on to provide load. There are also engine dynos that connect to directly to the engine (engine is out of the car).


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Tony
'01 Stock Spectra Blue
'94 12psi Turbo Miata
 

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here is how a dynojet works, it takes 2 drums, for a standard dynojet, and measures how fast you accelerate the drums, using your wheels and engine to turn them. it only starts to measure, after a button is pushed, and will stop measuring after that button is pushed again.
through some math formulas, it takes into account the speed the drums are accelerated, through a magnetic pickup, below the drum wheels, and then calculates torque, from that it can calculate horsepower. the way it knows the rpms, is because a sensor is put over one of your sparkplug wires, like on a timing light, and it measures the rpms from that. they way it knows your amount of cylinders, and how many times your ignition fires per 1 engine revolution, is that the operator inputs that stuff into the computer before a run is attempted.
 
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