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Could anyone shed any light on the difference between Nm and lb-ft, both quoted as vehicle torque figures? (in a similar manner between PS & BHP or completely different??)

Isn't it like comparing kgs with lbs? Just two different ways of measuring the same thing!

Nige_RS4 wrote:Isn't it like comparing kgs with lbs? Just two different ways of measuring the same thing!

Hit the nail on the head there

I read this somewhere; -

Torque = force x distance

English units of torque are pound-inches (lb/in) or pound-feet (lb/ft).

the SI unit (international measurement) is the Newton-meter (Nm).

Torque counts contain a distance and force. To calc torque multiply force by distance from the center. A car engine creates torque and uses it to spin the crankshaft. This creates torque by applying force at a distance.

HP = 1.36 kW

torque lb/ft = NM/1.36

1 n m = O.74 ib/ft

Cheers, was clearly having a senior moment there, obvious really its a metric/imperial m/ft thing

To convert from: To: Multiply by:

BHP - PS - 1.01387
BHP - Ft Lbs/second - 550
BHP - Watts - 745.7
PS - Kg M/second - 75
PS - Ft Lbs/second - 542.476
PS - Watts - 735.5
Kilowatts - BHP - 1.341
Kilowatts - PS - 1.360
Lb Ft - Nm - 1.356

So NM shows as being higher figure than lbs............ hence why the car industry is quoting NM?

Probably Simon yeh but also that Nm is an international figure not just a british measurement

Next you will have us converting to PS instead of BHP............ Being sort of British, can we not stick to English measures.......... or is that not EU compliant.........

so when someone torques bullshit is that in nm or lb/ft..

I've got a sad Excel spreadsheet that does the conversions for you. Spose I could post it in the downloads section???

Paul

[quote="derdle"]I

Do it

It won't let me!

You will probably have to submit via the Crew. PM them.

300lbs/ft is near as damn it 400NM which is the torque of a standard B5 S4 - I always remember that and beacuse the numbers are quite nice it makes other calculations fairly intuitive.