Dyno sheet torque reading?

You will get a different answer from each place, no one runs theirs the same as each other.

 

5252 / rpm * HP = torque

Just do that for each line.

 

Horsepower is torque multiplied by rpm divided by 5252. If you increase tire size, you'll also increase how fast the tires spin the dyno rollers but you'll decrease the amount of torque applied to said rollers. If you decrease tire size, you decrease the roller rpm and increase the torque applied. So no matter the size of the tires, the horsepower will always work out to the same number.

 

Horsepower & Torque Calculator | Spicer Parts

 

That seems to only work at peak HP numbers and was right in line with just dividing wheel torque by the rear ratio. 9896/3.55=2787ft-lbs at 2149.50 rpm which was showing 1138 HP.

Peak torque during the run I have results for did so at 2151 rpm at the engine started accelerating the rollers and the max torque reading at the tires was 10160 at 2150 rpm, at this point the HP was only reading 1114, but measure torque was much higher, done with the same calculations 10160/3.55=2860ft-lbs but that calculator only shows 2720 because of the lower HP at the same RPM.

Problem lies is as dyno load fluctuated the engine power dropped but torque showed much higher at almost the same RPM as peak power.

 

Unless its a rageing machine,my guess tq in real world would be about 2100 ft lb,not a cat man so its just a guess..Now allow about 300-400 lb for drive line loss..So actual road tq im guessing is 1700 ish to the ground..Hp should be ball park 475-495 to the ground..

 

Torque and speed are items that can be measured with a dynamometer, HP is calculated.

Early hydraulic dynamometer, with dead-weight torque measurement
A dynamometer or "dyno" for short, is a device for measuring force, torque, or power. For example, the power produced by an engine, motor or other rotating prime mover can be calculated by simultaneously measuring torque and rotational speed (RPM).