hp/weight question

does anyone know the equation for hp to weight ratio? with all the talk about miscommunication on the forums lately I guess i should explain myself. If i were to take out the spare tire and back seats from my car how much horsepower would i gain.

how this applies to the 240:

the follow up question is,

SR with it's turbo weighs about as much as an stock KA, and a turbo on the KA is going to add about 100 or so lbs, all over in the front. But there is 300HP to the wheels easy...with the right parts maybe even 400. But with the extra weight what is the actual hp?

the big picture question is how fast is the car's overall speed is... for example on a straight line a 280 hp dodge diplomat will get smoked by a 160 nissan/honda car because of the weight difference...

sorry guys for such a long post but i didn't want any confusion. So my original question is what is that equation for true hp. I know there is a website where you put it in but i can't find it.

just use the 1/4mi calculator, works great

http://www.mrccfl.com/quartermile.html

it's right on

just use the 1/4mi calculator, works great

http://www.mrccfl.com/quartermile.html

it's right on


thanks man appreciate that.

Hi (sorry this is going to be a long one!)

Horsepower to weight ration (Hp/W) is only a part of the equation on a ½ on a mile run, or what ever you’re running.

You can calculate how that ration by dividing the Hp by the total weight (for a 240 its 2700 lb) and that is your Hp/W ratio.

Now the second part of the EQ is when the Torq and Hp kike in. that’s when you use the dyno graph to analyze and tune the car.

For an example if a car (A) has 230 Hp and the Max Hp kikes in at 7500 rpm and a car (B) has 230 Hp and the max Hp kikes in at 5500 then car (B) will most likely win because it got its Hp much quicker.


Also Torq can be compared at the same fashion.

The third aspect of Hp/W is weight it self, no mater how light is the car it need to have proper weight distribution, the wrong configuration can lead to smoking tiers and no traction.

Well I can write about this stuff forever! Hopefully I’ve helped somewhat, I’m a just a 2rd year Chen Eng, but if you want details on that subject I can contact my friend for you he is a Mechanical Engineer.

Good luck and sorry for the lengthy reply!

nice (mynismo) i like that calculator tnxs!

for every 100lbs lost, you drop about 1/10th of a second from your quarter mile time.

also, the SR with turbo set up (not IC) weighs about 50lbs less then a KA. with a turbo, the KA will weight about 100lbs more then the stock SR