If you're a true boffin of vehicular performance then you will know that power is just a headline figure for selling cars. The true superlative for gauging a cars potential for greatness is torque. Take a look at the Diesel generation of performance cars and you'll see that low down torque is the way to go - albeit with a number of turbos to help out.
Use the calculators below to convert the weights from ft-lb Foot-Pounds to N m Newton Metres or from N m Newton Metres to ft-lb Foot-Pounds. Once you have done this you could compare the power to weight with AutoSnout.com's lb-ft per ton or N M per ton lists. Torque Per Ton List or why not find out the BHP of your car and calculate what it can do the quarter mile in here: Car Quarter Mile Calculator