There are a few models - but they are all approximate. The power output of two cars exactly the same from the factory will never quite match.
Air temperature, tyre material, friction in the gearbox, oil type etc all have an effect along with 100's of other factors. You'd have to enter so many parameters that you will have to spend an hour typing in the technical data to get a result.
You might want to try downloading:-
http://downloads.zdnet.co.uk/0,39025...117513s,00.htm.