When roughly calculating vehicle's REAL Horsepower...

[LOLyourFace]

I simply do: Horsepower / Weight =

Is that about right? Anything else I should factor in? How about torque?

 

[Quixfire]

Try This or This

 

[Lifer]

Originally posted by: LOLyourFace
I simply do: Horsepower / Weight =

Is that about right? Anything else I should factor in? How about torque?

wtf is hp / weight?
it's clear you know nothing about the topic.

it ur talking between crank and wheel hp, there's no accurate "formula".
a dyno will give u wheel hp, which in itself is also inaccurate due to different conditions and types of dynos.
the approximation from the drivetrain loss is anything from 10-25%

 

[Ornery]

Fvck horsepower, especially as it relates to hyper screamers. That reminds me of the amplifier power wars of 20 years ago, when they used 'Peak Power', instead of RMS, to advertise their crap. Torque is what feels like true power!

 

[vi edit]

Originally posted by: Ornery
Fvck horsepower, especially as it relates to hyper screamers. That reminds me of the amplifier power wars of 20 years ago, when they used 'Peak Power', instead of RMS, to advertise their crap. Torque is what feels like true power!

True, but you can't ignore horsepower. A Vette w/ 190HP wouldn't be much fun now would it?

 

[LOLyourFace]

Originally posted by: Lifer

Originally posted by: LOLyourFace
I simply do: Horsepower / Weight =

Is that about right? Anything else I should factor in? How about torque?

wtf is hp / weight?
it's clear you know nothing about the topic.

it ur talking between crank and wheel hp, there's no accurate "formula".
a dyno will give u wheel hp, which in itself is also inaccurate due to different conditions and types of dynos.
the approximation from the drivetrain loss is anything from 10-25%

I'm talking about a simple applicability of horsepower. For an example: An Altima has 175 horsepower vs Hyundai XG has 210hp. But XG is much more sluggish because it's about 1000 lbs heavier.

That's what I meant.

 

[Lifer]

Originally posted by: LOLyourFace

Originally posted by: Lifer

Originally posted by: LOLyourFace
I simply do: Horsepower / Weight =

Is that about right? Anything else I should factor in? How about torque?

wtf is hp / weight?
it's clear you know nothing about the topic.

it ur talking between crank and wheel hp, there's no accurate "formula".
a dyno will give u wheel hp, which in itself is also inaccurate due to different conditions and types of dynos.
the approximation from the drivetrain loss is anything from 10-25%

I'm talking about a simple applicability of horsepower. For an example: An Altima has 175 horsepower vs Hyundai XG has 210hp. But XG is much more sluggish because it's about 1000 lbs heavier.

That's what I meant.

thats power to weight ratio.
nothing close to approximating hp.

 

[Ornery]

Originally posted by: vi_edit

Originally posted by: Ornery
Fvck horsepower, especially as it relates to hyper screamers. That reminds me of the amplifier power wars of 20 years ago, when they used 'Peak Power', instead of RMS, to advertise their crap. Torque is what feels like true power!

True, but you can't ignore horsepower. A Vette w/ 190HP wouldn't be much fun now would it?

Wouldn't have any torque either I bet.

Nothing like a car getting effortlessly up to speed. I just can't understand the thrill of rowing through several gears to get up to 50MPH

 

[vi edit]

I'm talking about a simple applicability of horsepower. For an example: An Altima has 175 horsepower vs Hyundai XG has 210hp. But XG is much more sluggish because it's about 1000 lbs heavier.

That's what I meant.

Well, I'm certainly not an expert on the issue and there are people FAR more knowledgable on the subject but you are forgetting exactly what Ornery mentioned - torque.
Torque is what can overcome weight and get you going. HP is more of an issue of top speed while torque is more of the force that gets you moving.

 

True, but you can't ignore horsepower. A Vette w/ 190HP wouldn't be much fun now would it?

Yes it would if it had 500 L.B.S. of torque.

 

[fastz28]

HP rules the magazine; TQ rules the street.

 

[MercenaryForHire]

LOLyourFace = Riceboy? :Q

- M4H

 

[rudder]

1 horsepower eguals moving 550 pounds one foot in one second.

 

[RU482]

hehe

"roughly calculate" and "REAL" kinda contradict each other, don't they?

 

[Zenmervolt]

Originally posted by: vi_edit

Originally posted by: Ornery
Fvck horsepower, especially as it relates to hyper screamers. That reminds me of the amplifier power wars of 20 years ago, when they used 'Peak Power', instead of RMS, to advertise their crap. Torque is what feels like true power!

True, but you can't ignore horsepower. A Vette w/ 190HP wouldn't be much fun now would it?

Eh, I know a guy with a '77 'Vette and it's still a fun car. His was 180 hp stock, he probably has 190 hp now with his mild upgrades.

ZV

 

[Zenmervolt]

Originally posted by: fastz28
HP rules the magazine; TQ rules the street.

More like horsepower dictates how fast you can ultimately go under given conditions, while torque dictates how quickly you can get to that speed.

ZV

 

[Vic]

Originally posted by: Roger

True, but you can't ignore horsepower. A Vette w/ 190HP wouldn't be much fun now would it?

Yes it would if it had 500 L.B.S. of torque.

hp is a function of tq and rpm (and not independent of tq). While tq represents force, hp represents power, or force over time.

If such an engine had 500 ft-lbs of tq but only 190 hp, then it would be a diesel (or would drive like a diesel). Low revving, etc. I calculate max hp for that engine would be at about 1996 rpm.

A good "fun" engine should have a proper balance between hp and tq. The tq curve should come on early and be long and flat, and peak hp should be around 5000-6000 rpm and at an amount similar to the peak tq.

 

hp is a function of tq and rpm (and not independent of tq). While tq represents force, hp represents power, or force over time.

If such an engine had 500 ft-lbs of tq but only 190 hp, then it would be a diesel (or would drive like a diesel). Low revving, etc. I calculate max hp for that engine would be at about 1996 rpm.

A good "fun" engine should have a proper balance between hp and tq. The tq curve should come on early and be long and flat, and peak hp should be around 5000-6000 rpm and at an amount similar to the peak tq.

Hey Vic, do I look like a dumbass to you ?

 

[arcenite]

Originally posted by: Roger

True, but you can't ignore horsepower. A Vette w/ 190HP wouldn't be much fun now would it?

Yes it would if it had 500 L.B.S. of torque.

Wouldn't it then have a redline of like.. 2k or something??

Bill

 

[vi edit]

Yeh, my comment about the 190HP vette was to relate it to a diesel. Yes, there are some diesel performance cars, but they are very rare and not a typical type of engine that you would find in wide use.

I never said that it wouldn't be fast, I said it wouldn't be as much fun. Personally, there is some satisfaction winding a car up several thousand RPM's. Can't really do that with a diesel or a car that drives like a diesel.

 

[Vic]

Originally posted by: Roger
Hey Vic, do I look like a dumbass to you ?

Can't see you through the monitor, Roger, so I have no idea what you look like

 

[GalvanizedYankee]

Originally posted by: LOLyourFace
I simply do: Horsepower / Weight =

Is that about right? Anything else I should factor in? How about torque?

There is a program out called, Desktop Dyno (a number of them at Google),
I will buy one someday. If for nothing else to play with it. You buy it first .

It gets into it all. Port sizes, cam profiles, lift rates, port velocities, intake runner/header
diameters, bore/stroke ratios, stroke/rod length ratios, displacement, etc......

If you find a down load for a trial, PM me please.

:sun:

 

[Quixfire]

I've heard that a red R will add about 15-20 hp.

 

[thomsbrain]

you're just talking about the power to weight ratio. you usually put the weight on top. so car x has 10 pounds to pull per horsepower and car Y has 8.5.

 

[sillymofo]

I can't even believe people are associating HP with Torque, how the fcuk? Torque has to do with gearing, and given the same gearing, the more HP applied will result in more torque and higher speed. If you have completely different gearings, then it doesn't really matter how much HP you have, you could have less torque than something that has half as much HP. Don't you people know anything about basic physics?