anyone know website on calculating 0 to 60 times vrs how much weight you have?

[echocluster]

i know how much horsepower i have, and the weight of the car. so there somewhere i can go to fugure out how fast it would be aprox. to 0 to 60 mph?

[Bambikiller240]

I don't know of a site that would tell you what you want to know, but I do know that you'd need more info than weight and HP to figure it out. You'd need Transmission ratio's and Diff ratio, and tire diameter also. The answer calculated would just be a "number" and not very relavant to the real world. You'd also need to know where in the RPM range your engine makes power (torque curve) I think.

[Gav240z]

Why don't you just run it down the 1/4 mile.

[kyteler]

The amount of time you spend trying to find out all the various info you'd need to evaluate such a figure, which in the end would probably not even work out vaguely close to the realistic time, would be better spent with a stopwatch and a straight piece of track.

Just a thought.

[panchovisa]

I recall an "old rule of thumb" about the relation of weight vs hp.

It goes something like this: for every 4 lbs additional weight you need an extra hp to maintain the same acceleration.

A Z with 200hp at 2,000 lbs will accelerate as quickly (same tire dia., gear ratios, etc.) as a 3,000 lb Camaro with 450 hp. The 1,000 lb difference divided by 4= 250 additional hp plus the Z's 200 hp equals the 450 hp.

I know that the Z example figures out to 10 lbs/hp and the Camaro example figures out to 6.67 lbs/hp. But, we are talking acceleration in which the inertia of the "mass" needs to be overcome by greater than a linear function.

Take a look at any car magazine test results for 0-60 mph and you will see that heavier cars need a much lower lbs/hp ratio to achieve slightly quicker acceleration.

Conversely, if you remove 4 lbs from yor car you have effectively gained one hp (even though a dyno would not show any change) worth of acceleration.

Tese examples are for "dead weight" (body panels, etc), rotating weight (wheels, tires, brake rotors) have an even greater effect on acceleration because two different inertia's must be overcome (rotational inertia, and vehicle inertia).

If you want to go faster for less money than that "new nitrous oxide set-up" costs, than put your car on a diet.

[echocluster]

i dont have the car....i was thinking of buying a subaru impreza rs and i wanted to know how much slower it was then the wrx. i searched all the mags to see if anyone had tested one. all they tested were wrx's.

[shabba]

Originally posted by echocluster

i dont have the car....i was thinking of buying a subaru impreza rs and i wanted to know how much slower it was then the wrx. i searched all the mags to see if anyone had tested one. all they tested were wrx's.

Check out Car and Driver..the last time they tested the car it ran to 60 in the upper 7-lower 8 second range. Not too bad for such a heavy car with 165 horse power. Then again, the WRX is quite a car for the money and goes to 60, with a decent driver, in the sub 6-low 6 range...

[ZmeFly]

I guess its accurate, I plugged in my MPH on the 1/4 and my times on the 1/4 as well.

One says almost 300 at the flywheel, I doubt it, the other says about 275 at the flywheel.

Well heres the link check it out.

http://www.cprparts.com/HPcalculator.html

[echocluster]

it does not say what you would do 0 to 60. i dont know what the 1/4 mile mark is, so i dont know how to figure out the rest.

[ZmeFly]

Here is the one I was looking at.

http://www.cars-cars-cars.org/0-60-Times-Calculator.htm

[PrOxLaMuS©]

Don't forget!

This will be inaccurate...

What effects the accuracy and precision?

-Weather (Is it hot or cold?)

-Altitude (How high up are you located?)

-Humidity (How much moisture is in the air?)

-Tires (What kind of tires are you running?)

-Transmission (Are you running an automatic or standard? 4spd 5spd?)

-Rear end (what kinda of rear end are you running? 3.5, 3.9,4.11?)

-Road conditions (New concrete? Asphualt? Old?)

-Wind conditions (Is it windy? Cross wind? TailWind? Head wind?)

These can lead to dramatic results ranging from .1 seconds to 3 seconds... like up here in Colorado... 3,000 feet above sea level.

[thefastestz]

Isn't there some little radar look alike thingy that plugs into your cigarette lighter and somewhat gives you a 0-60 time and more stuff. I've heard of this but i never cared to find out more. Anyone know what one of these units is.

Of course if you live in a place where there is a local strip that would be the ideal place to get a time.