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Need info on understanding the dyno #`S

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Old Nov 10, 2007 | 11:04 PM
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Default Need info on understanding the dyno #`S

My understanding is the Dyno measures torque and estimates RWHP or vise-versa? Which one is it?

Why alot of the graphs cross HP and torque at 5200 RPM? I know it has something to do with my first question.

What are the benefits to having a 500 TQ and 600 rwhp. My understanding is torque the amount of power needed to move something. Its just when I look at some graphs the torque seems to start dropping off around 5500/5700 and the RWHP keeps increasing. Whats the real benefit to that.
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Old Nov 10, 2007 | 11:18 PM
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HP=TQ*rpm/5250 (the actual # isn't exactly 5250, but approximately)
This is merely a math equation. That means that TQ and HP will always be equal at 5250rpm. Your other questions are all specific to what application you are looking at.
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Old Nov 11, 2007 | 10:02 PM
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Originally Posted by gametech
HP=TQ*rpm/5250 (the actual # isn't exactly 5250, but approximately)
This is merely a math equation. That means that TQ and HP will always be equal at 5250rpm. Your other questions are all specific to what application you are looking at.
Actually it is HP=TQ*rpm/5252, hence why all HP and TQ curves cross at this point.

Horsepower can not be measure, it can only be calculated. Dynojets calculate horse power and then back calculate torque based on rpms. Other dyno liek a Dynapack can actually measure true axle torque, then use the HP formula to calculate horsepower.
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Old Nov 14, 2007 | 10:19 AM
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Originally Posted by 12secSS
Actually it is HP=TQ*rpm/5252, hence why all HP and TQ curves cross at this point.

Horsepower can not be measure, it can only be calculated. Dynojets calculate horse power and then back calculate torque based on rpms. Other dyno liek a Dynapack can actually measure true axle torque, then use the HP formula to calculate horsepower.
Dynojets and other inertia dynos calculate the horsepower curve using a mathmatical model which is basically work over time. They then take the Intergral of the calculated horsepower curve to arrive at the torque curve. Load based dyno's such as the Dynapacks and Mustang dyno's actually measure the torque and use the derivative of the torque curve to arrive at the Horsepower number.

One thing to remember is that torque is an actual force, much like gravity and magnetism. It is measurable. Horsepower is not.
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