Not sure if I'm posting in the right area but I was wondering if anyone know the conversion from Newton Units to Newton Meters? The dyno sheet gives the peak power OK but not torque in meaningful language.....for me anyway.

Thanks in advance.

Not sure if I'm posting in the right area but I was wondering if anyone know the conversion from Newton Units to Newton Meters? The dyno sheet gives the peak power OK but not torque in meaningful language.....for me anyway.

Thanks in advance.

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my dyno sheets read as standard 450newtons @wheels and stradard torque is 450nm at motor after tuning it read 600newtons@wheels so is that helping you?

I can't find anything in my conversion software called a "Newton Unit"

A newton is a unit, a newton-metre is also a unit...

They can't be compared properly due to the fact torque is a turning force (ie in a circular motion) and a newton is a force measured in a straight line.

Hope that clears things up.

Steve

And from memory the unit Newton-Metre is a measure of the force at 1m away from the fulcrum or axis... although this could be completely wrong as it was that long ago I did physics in school

newtons = force same as pounds or kilo's

newton meters is moments of torque ie 1 newton of force at 1 metre from the the pivot (the moment) = 1newton metre

same as foot pounds (ftlbs) is 1 foot pound is 1 pound of force 1 foot from the moment of torqe(the pivot piont)

as for converting from newtons on a dyno chart to newton metres NO FRICKIN IDEA!!.. i imagine there would be some kind of formula in the dyno software that would take into acount wheel radius and dyno roller radius to determine the moment of torque against the resistance of the dyon but stuff if i know how it works.....

I think he means how do you work out torque from the N's of tractive effort readout that the dyno dynamics printouts give you.

I would like to know this aswell...

Chris

Try a tuner that bothers to set your car up on the dyno properly by entering either the kmh/rpm relationship in the gear the car is dynoed in, or (even better) uses the Dyno Dynamics inductive rpm pickup. Proper graphing of Nm with a Dyno Dynamics is quite easy, and wont give the bogus 1000Nm+ at the wheels figures that other dynos do

Seconded, in the words of Doctor Nick "it's just so ridiculous!!"

Try a tuner that bothers to set your car up on the dyno properly by entering either the kmh/rpm relationship in the gear the car is dynoed in, or (even better) uses the Dyno Dynamics inductive rpm pickup. Proper graphing of Nm with a Dyno Dynamics is quite easy, and wont give the bogus 1000Nm+ at the wheels figures that other dynos do

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The conversion from Newtons to Newton Metres is such:

Multiply the Newtons by 0.1085 and that will give you the Torque in NM.

The figure of 0.1085 is the roller radius in metres, and this is what is used

to calculate the Tractive Effort on DD Dyno's that have 217mm diameter rollers (99% of them).

So for example, if you have 5500 newtons, this will be 596.75 Newton Metres at the rollers.

If the dyno operator chooses to insert the correct kmh/rpm realationship, this 596.75nm figure would be reduced by the ratio of Engine Rpm to Roller Rpm to make the figure more user friendly, ie. you expect a torque loss at the wheels just like there is power loss, whereas in most cases there is a torque multiplication due

to gearing.

So if you had a vehicle that was making 256rwkw @ 100kph, this would be making 1000nm at the rollers (9216 newtons), is this bogus?

If you were still making 1000nm @ 180kph, you would be then making 460rwkw, is this still bogus, a soft tune on a GenT1000 easily does that.

If the correct kph/rpm was applied to the example of 1000nm at the rollers, it would be displayed as 769nm on a vehicle with 3.9 diff gears, done in a 1:1 gear ratio in the trans.