how much horsepower does it take to make up for 300 pounds?

in other words, two cars have the same engine, but one car weighs 300 pounds more. or, if you add a permanent 300 pounds to your car, how much power would it take to compensate?

 

Whatever is necessary to keep the same power:weight ratio.

If you add 300lbs to a 300lb bike...well, you're going to need twice the horsepower to compensate. If the bike had 1hp, then you'll need another hp. If it had 100hp, you'll need 100hp.

If you add 300lbs to a school bus...you probably won't need very much horsepower to compensate.

 

so i'm overcomplicating it as usual.

so lets say i have 140 whp in a 2400 pound car, that's a 7:120 ratio. so i would need something like 17.5 whp to make up for 300 pounds in this example?

i get it. so that's 17.1 lbs per one hp.