How does a Dyno Really Work?

I don't think some see fully how rpm contributes, torque is the average force coming out of the crank that somewhat varies with rpm mainly cause Volumetric Efficiency (VE) varies with rpm compared to an electric engine where torque is mainly flat cause of steady supply of electricity at all operating rpms.

Rpm isn't a by-product it's an equal factor to torque in moving your car (performance), HP basically the sum of all the power strokes (rpm), the easiest way to look at rpm contribution is by hp % of torque at each rpm.

We all know at 5252 rpm hp is always 100% of torque, but it's the same at other rpms as well, the hp/tq % amount is static at each rpm, under 5252 rpm, hp is always less than torque Eg. 1313 rpm = 25%, 2626 rpm = 50%, 3939 rpm = 75%, etc..

Why people love so called torque engines (displacement) on the street cause the HP is generally gonna be less than torque at street rpm/speeds why diesel are perfered at super low rpm operation cause they make so much torque at these low rpms and is needed to make any useable power down there with hp per tq % being so low at those rpms.

Above 5252 rpm, Hp is higher than torque, Eg. 6565 rpm = 125%, 7878 rpm = 150%, 9191 rpm = 175%, 10,504 rpm = 200% etc.. Obviously high rpm has a great multiplying effect on hp when making useable tq up here.