What do dyno numbers mean?
What do dyno numbers mean?
Dynamometers are used all the time to measure power output for cars. The standard estimate for comparing wheel horsepower (the number retrieved from the dyno) to crank horsepower (the manufacturer’s claimed number) is a 15 percent difference. The first run was simply a baseline used to measure RPM readout.
How does a dyno measure HP?
A dynamometer places a load on the engine and measures the amount of power that the engine can produce against the load. A dynamometer measures this torque. You can easily convert torque to horsepower by multiplying torque by rpm/5,252.
Are dyno numbers accurate?
Though they may not be the most accurate for obtaining horsepower and torque figures, they are immensely useful for calculating power curves and determining how well a car reacts to modifications after a baseline figure has been established.
Do all dynos read the same?
It all depends on the dyno and how it is reading and computing the power / load ratings. There are “inertia” dyno’s that give a particular number, and there are “load” dyno’s that give an entirely different number.
Does a dyno measure torque or HP?
Engine Dyno Basics An engine dyno calculates power output directly by measuring the force (torque) required to hold a spinning engine at a set speed (rpm). The dyno software then calculates horsepower based on the torque figure and engine rpm (horsepower equals torque times engine speed, divided by 5,252).
How do you read dyno results?
Reading a Dyno Graph
- Look at the shape of the torque curve – Generally the graph should be relatively smooth with no big bumps or dips.
- Look at the engine speed where peak torque and peak power occur – If peak torque occurs early and ramps up steeply, the turbo will likely be fast spooling and be responsive to drive.
Does higher horsepower mean faster?
The more horsepower, the faster and quicker the car. For example, most formula one race cars can rev up to 18,000 RPM, and hence their horsepower is extremely high. Today the term horsepower is widely used in motor racing to describe power and performance: “the greater the horsepower, the greater the performance.”
What is motive force on dyno?
Remember the larger roller will be doing less rpm at a given road speed, so the same power will be present. To simplify this somewhat, both Dyno manufacturers have a term that makes the differences in Roller sizes a non-issue, this term is Motive Force on a Mainline DynoLog, or Tractive effort on a Dyno Dynamics.
