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I am just guessing here but could the 1 hp per 10 lbs be true when the car has 200 hp or something like that? So that once you get to like 100 HP car, 20 lb is 1 HP. and when it gets down to 50 HP car, 40 lbs = 1 HP. This way you can never get to 0 or - HP because the HP loss follows an exponential curve. This is how I have come to understand it. When I had 4 people in my car, plus my subs = 700 lb. I know I wasn't running 60 HP but I am sure it was close to 100 or a bit less. If this makes sense give me a

 
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ummmmmm ok whatever

 
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I somewhat agree with NBP Civic. The relationship between weight-load and horsepower cannot be linked together. No matter how much wieght you dump into a 100 hp car, you still get 100 hp to the wheels (example: put a vic engine in a heavy @$$ H2 and you still have 100 hp to the wheels). However, weight does have a direct relationship with acceleration, and THIS relationship follows an exponential curve to keep you from accelerating at 0 ft/sec/sec under super-heavy payloads. Trust me guys.....I've been giving this alot of thought. You can't think of weight = hp (it won't make sense).

 
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i have this game called tokyo extreme racer 2 for dreamcast and i made a 3000gt vr4 weigh in at about 4045 lbs with 380 hp and for some odd reason, i can still get it to 180 mph with optimal gearing... but oh well, thats just a game its not that realistic.

 
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Damn this is an old thread. I dont remember posting on it.

 
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i tested it....

i weight a good 270, and i added up the weights of 4 of my friends

we all weird 1k together

we all hopped in, and my car felt slower, but not 27 hp slow...

i could still get to 90

 
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try racing a viper with about 400+ lbs. extra in your car from 3 extra people...craziness.

 
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i can get to 120+ w/ 2-3 xtra people

 
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i always heard the more people in your car, the faster it goes... weight is directly related to inertia?? right? haha.. geez, simple physics.

 
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i hope you are joking, the more people the more HP it takes to haul that weight

 
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The hp/weight issue is true. Why else would drag cars be gutted? If it wasn't true don't you think everyone would be running full interior? I don't think that -10lbs=+1hp ratio is correct though. It is absolutely true that the lighter a car is the faster it will excelerate. It's top speed will also be increased.

 
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This subject has really intrigued, and I think there's someway I can put it on an Excel spreadsheet..

So our cars can go from 0-60 in about 8.4 seconds, right? How many feet is that?

 
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lol. what a old *** thread.

I was reading it and then suddenly I saw my post and I'm like wtf I dont remember posting anything recently.

if any of us know any physics, we would be able to answer this easily.

as someone said, its not directly a hp - weight issue...

the car is still a 100 hp, 100 lbs. ft of torque car... but it just takes longer to get going..

TORQUE: The moment of a force; the measure of a force's tendency to produce torsion and rotation about an axis, equal to the vector product of the radius vector from the axis of rotation to the point of application of the force and the force vector.

since torque is measured by POUNDS PER FEET...

if we add more POUNDS... it takes more TORQUE to get going.

lets not forget about about good old torque, the thing that gets you going in the first place.

and I still think -10 lbs = + 1 hp is eh.

more like, I know what that statement means, it's saying "taking away 10 lbs of weight on your car will be like adding an extra 1 horsepower on your engine..."

but eh i still think thats not exactly sound.

no argument for that though. lol.

 
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Top speed is dictated by your transmission gear ratios, rev limit, and the diameter of your tire/wheel combo. Weight will not make a difference, except that more weight will obviously make the car reach top speed less quickly.

 
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Indeed this thread is as old as Bob Hope, but still an interesting topic, even if a bit immaterial to cars in our class. I have never heard of the weight/hp ratio calculations, but I have heard several times that as a general rule every 100lbs=.10sec less in the 1/4, racing wise. So if you add 500lbs with heavy-*** rims, a boomin' system, and your fat uncle Bob next to you, then you will be about 1/2 second slower than a comparable Civic. So there may be something to the weight/hp ratio after all. Any Will Hunting types out there who can crunch numbers and figure this out for sure?

 
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theres this one video i have when they completely gutted out a sentra and made it run 14s since the made it a "convertible", cut off the trunk, took out all the insides and seats, so its basically a "running frame" lol

 
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wasn't that an article in SCC?

 
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yeah, i think it was.