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Message: <blockquote data-quote="fabianyee" data-source="post: 183525" data-attributes="member: 6">I have received PM enquiring what is Dyno.In a nutshell, the term Dyno here refers to strapping the car on the floor mounted dynometer with the driven wheel (in BMW case, the rear wheels) on the rolling barrel (or whatever u call them). Then the car would be 'driven' for the driven wheels to make the rolling barrel roll for the dynometer to calculate the amount of torque and horsepower across the RPM range. A chart would be plotted and displayed on the computer screen.Normally, there would be 3 runs. and Air Fuel Ratio (AFR) would be taken too, using a lambda probe. So u can ectually know whether your engine is healthy or not looking at the chart. And also whether your mods are working well or not..</blockquote>