How Do I Convert Torque?

[ardi]

Just wondering how to figure out how many Nm my car has? Dyno sheet is in newtons... Any ideas what it works out to be???

[Ralph Wiggum]

Theres not direct conversion, Newtons is 1/2 of the information you need too convert your dyno sheet to Newton meters.

You need too know the radius of your rear wheel and load cell arm length (or roller Dia) that the dyno uses. That will give you the Metres compenent of NM. Your torque figure divided by your Torque moment (Wheel Dia + roller Dia or wheel Dia + Load cell arm Diameter) will give you Newtowns per meter.

This will tell you exactly how much twist (torque) your car is providing from the centre of the axle,

See the link below:

wheelhttp://www.grc.nasa.gov/WWW/K-12/airplane/torque.html

You Know W(newtons) but you need LRoller Dia or load cell arm lenght too calculate FNewtonmeters of torque.

Best be would be too call you tuner and ask them too print a Graph with an Axis of NW rather that Newtons.

[ardi]

Cheers mate! Sounds bit technical!

[Ralph Wiggum]

IIRC for the tuner to get a torque reading from a dyno dynamics dyno they need too enter road speed and rpm at set points in the gear the car will be dyno'd in. This allows the dyno too calculate the final drive ration and wheel size based on roller Rpm. The dyno can then use this calculation to calculate the torque figure

(I could be wrong tho....)