horsepower

[Anabolios]

so about how fast does a car go based on its horsepower. like about how fast would a 90hp car go, a 100hp, car, a 140hp car, a 150hp car, and a 180hp car go?

depends on the weight of the car..its condition,transmission,driver,cylinders,induction system
i have a maxima with manual transmission coming in @ 222 HP and its really fast on the highway and faster in the higher gears

[Flexor]

Forget all the fancy shit and guesswork guys. All it takes is a simple bit of mathematics. You use a cubed route formula.

All you do is

Cubed route of (Horsepower you want/Actual hp) x original MPH

So for my car with only 75hp, say I gave it 150. Its top speed is 115, so...

³√(150/75) x 115 = 144 mph

Notice now that I rapidly increase HP, the mph does not go through the roof

³√(300/75) x 115 = 182 mph

That is because the formula has taken into account the speed characteristics in the data you provide. Changes with each car as well. Some factors are not taken into account such as gear ratios, but you assume that these step up proportionally. Speed is directly related to wind resistance and power. Double the power, you can't double the speed because of wind resistance having a greater effect the faster you go. The cubed route formula works because this is the relationship between these three main factors

[craneboy]

fast is cool but exceleration is king and torque and light weight equal exceleration

[TantruM]

fast is cool but exceleration is king and torque and light weight equal exceleration

think its spelled with an a craneboy... but ill agree with ya id take a car that got to 150mph fast over one that makes it to 200 but needs a 3 mile straight away

[Dalton5]

Forget all the fancy shit and guesswork guys. All it takes is a simple bit of mathematics. You use a cubed route formula.

All you do is

Cubed route of (Horsepower you want/Actual hp) x original MPH

So for my car with only 75hp, say I gave it 150. Its top speed is 115, so...

³√(150/75) x 115 = 144 mph

Notice now that I rapidly increase HP, the mph does not go through the roof

³√(300/75) x 115 = 182 mph

That is because the formula has taken into account the speed characteristics in the data you provide. Changes with each car as well. Some factors are not taken into account such as gear ratios, but you assume that these step up proportionally. Speed is directly related to wind resistance and power. Double the power, you can't double the speed because of wind resistance having a greater effect the faster you go. The cubed route formula works because this is the relationship between these three main factors

This is crap, sounds like your an engineer not a mechanic.

[Flexor]

This is crap, sounds like your an engineer not a mechanic.

Sounds like you're a loser. I guarantee you it works, you look at any car range that has identical bodies but different models have different engine sizes and horsepower. Although the bigger engines are slightly heavier, the formula will accurately calculate how much faster the car with more horsepower will go. You can go and do the sums and check them against the official data and you will see its close...

[Dalton5]

Sounds like you're a loser. I guarantee you it works, you look at any car range that has identical bodies but different models have different engine sizes and horsepower. Although the bigger engines are slightly heavier, the formula will accurately calculate how much faster the car with more horsepower will go. You can go and do the sums and check them against the official data and you will see its close...

Well ill give you that, I AM a loser.......anyway, the original question was how fast does a car go based on its horsepower; what i am saying is there are far too many variables for this to be summed up in a nice little mathematical equation. Stuff like weight, gear ratios, amount of torque etc. as mentioned above come into play. Take the grand national for example, you'd be doing good to get 300 hp out of one however with its insane amount of torque it was the fastest production car (domestic) in 87'.

[NotSmall]

This is crap, sounds like your an engineer not a mechanic.

Erm, isn't it preferable to be an engineer rather than a mechanic?

[Dalton5]

Erm, isn't it preferable to be an engineer rather than a mechanic?

Whatever floats yur boat......if your interested in making a car run under 12 seconds in a quarter mile i think it would be better to do fancy work with a wrench as opposed to a calculator.

[tretch187]

Whatever floats yur boat......if your interested in making a car run under 12 seconds in a quarter mile i think it would be better to do fancy work with a wrench as opposed to a calculator.

But as an engineer you can just pay someone to wrench that will your disposable income

[Blown_SC]

Whatever floats yur boat......if your interested in making a car run under 12 seconds in a quarter mile i think it would be better to do fancy work with a wrench as opposed to a calculator.

LOL! How about a Mech. Engineer who makes cars run 8's?

[Flexor]

LOL! How about a Mech. Engineer who makes cars run 8's?

best of both worlds

[Dalton5]

LOL! How about a Mech. Engineer who makes cars run 8's?

I know, I know........Ill never have the money nor the knowhow to make a small block chevy go in 8 seconds, but for a back woods project where just as much money went into beer as into the car 11.8 ain't bad.