power = torque * rpm * K
where 'K' is a constant relating your units of torque, rpm and power
Normaly you'd give those figures at the flywheel or driven wheels. If you imagine an idealised engine (note not the ideal engine, just a hypothetical one) with a completley flat torque 'curve' all the way from idle to a 10k rpm limiter it would have a power 'curve' that goes up in proportion to its revs i.e. it would have twice the power at 4krpm as it does at 2krpm.
Now heres some more maths:
acceleration = force/mass
acceleration = [(torque*k)-drag]/mass
k= a constant determined form the cars drive ratio, as mass is constant, acceleration at any point in time is proportional to the cars torque minus the sum of all the retardign forces acting on it.
However if you believe a car has no 'torque' as its not accelerating your mistaken. Look at the equation. thers 3 variables you can play arround with.
Torque – can be varied either by altering your trottle opening or engine revs (change gear) to find a value that suits you (the highest would be desirable for acceleration)
drag – trucks have massive torque, but wontaccelerate past 60 because theyre shaped like bricks
k – ok its a 'constant' but you can always downshift :-p and generate more 'torque' at the back wheels.
A road car with 400bhp at 10k is just producing just the asame torque as an F1 car doing 800bhp at 20k.