Japtrix Racing

What is a Chassis Dynamometer? How does wheel torque compare to engine torque? What is an Inertial Chassis Dynamometer? If an Inertial Dynamometer doesn’t allow for steady state engine tuning, why use an inertial dynamometer? Why do I need to evaluate and/or tune vehicles under steady-state test conditions? Will torque and power data reported from an air-cooled eddy current dynamometer become less “accurate” or “repeatable” as brake temperature increases? Is an inertia dynamometer more repeatable than an eddy current dynamometer (or vice versa)? Why do I get more power on an inertial dynamometer than I do an absorption dynamometer (or vise-versa)? What role does roller diameter play in the design of a dynamometer, and how do I decide which roller size is best for my application? What is “Vehicle Simulation” and how will I benefit from it? Will my Elapsed Time Tests with the 7000 Series Eddy Current Controller be more accurate when the dynamometer is “cold”? What is a Cradle Roll Chassis Dynamometer? What does Steady State mean, and what type of Power Absorber is right for my application? Why does the dyno show a power loss after a differential gear change (say a 3.42 to 4.10 rear gear)? We ran a test for my car at 3500lbs, which is the approximate weight of the vehicle with me in it + 1/2 a tank of gas. Should we have used the curb weight instead? As far as the aero factor goes, is there any correlation to the coefficient of drag for a vehicle? For example, my car is a 0.36, whereas a BMW 3-series is a 0.28. To simulate an inertial dyno test, would you use "manual load" rather than a simulated ESS run, correct? Are hub-type dynamometers more accurate because they remove the tires, which are non-repeatable and inconsistent? Do hub-type dynamometers offer more accuracy because they can read small changes in output? Can my car come off of a roller dynamometer and crash? Can I test automatic transmission vehicles on a Mustang Dynamometer?

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