2006 Hondas

Bullshit. I raised the point ONLY to compare the Jazz and Fit to my Civic.

RTFP.

 

And you compared the engine horsepower of those cars, without regard to
each car's mass.

 

whats the diff between the fit and the jazz?

 

will you kids please grow up?

 

All you've done is joined the fray and kept Joseph ignorant.

 

HP = T*N/5252

Where T = Torque (lbft)
N = Speed (rpm)

Where did that 5252 come from????

A:The 5252 is a made up synthetic number.

You do the math.

 

My original post about this point was comparing the U.S. version
and lamentinhg that we couldn't get the 1.2 as it was much more
efficient for a paltry amount of loss in power.

 

JUst the name. In the U.K., they sell a version with
a tuned for maximum efficiency 1.2l engine. 60mpg highway
and about 50mpg overall efficiency. No hybrid nonsense
and it's not a tin can Smart Car or Mini, either.

 

The units that attach to the 5252 are (rev-ft-lb/min) / (hp-radian). It is a
"unity conversion factor," in the same way that 12 inches/foot and 1.34 hp /
kw are both "unity conversion factors," as in

length, inches = (length, feet) * 12

power, hp = (power, kw) * 1.34

 

Makes no difference. It's derived from the amount of torque and
how fast you are reving the engine. People have it backwards.
They think that "Horsepower" is how powerful an engine is and
it's really nearly useless in determining that. Of course,
people do the same thing in audio - they honestly think that
how many "watts" the receiver is rated for determines which
one is better.

 

"Better" is a broad characterization which may include many factors
including subjective ones. However, when it comes to the ability of
an engine to do work (such as accelerating a car) power is the primary
determinant.

If you have an engine that produces 10000 ft*lb at 10 rpm but won't
turn any faster, you are goining to be very slow even though you have
lots of torque. You will get beaten by a car of identical weight with
100 hp at 10,000 rpm every time. He will blow your doors off, even
though he might have peak torque of less than 1% of your engine.
orque alone doesn't matter. It's power that moves the car. Sorry.

 

You just changed your claim above that, "All that matters is torque.
Period."

Horsepower is commonly and rightly accepted as one measure of how powerful
an engine is.

The thread speaks for itself. I withdraw.

 

Except that it only takes about 40-50hp to maintain 70mph. That
one car can do 140 and the other only 100mph really means nothing.
(It's not as drastic as you imply for automobiles)

 

Yet this is as meaningless as "watts" are in audio. That it is
commonly accepted as such is meaningless. Torque is how powerful
the engine is. The rest is gearing, and any idiot can calculate
ratios or add another gear to the transmission.

 

Watts are not at all regarded as meaningless in audio. The unit is
misunderstood, misused, and like horesepower, does not tell the whole story.
You might want to review your basic physics with regard to the meanings of
the terms torque and power.

Leonard

 

Elle is right, horsepower is the only unit that makes sense to use.
For example, the typical civic needs 70HP to do 100mph and 90HP to do
110mph. Try to use torque to describe the same and write half a page
of meaningless equations.

 

Hey, where'd you get the numbers? I'm not disputing them; I'm just curious.

I remember researching the horsepower for cruising (ya know, normal speeds),
and I think it was around 20 to 30 hp. But as big an issue is how well a car
accelerates. That's when the horsepower becomes an important metric and
crude measure of how well a car will accelerate.

Torque and RPM certainly both have their place in discussions of what one
wants an engine to do, but I'd never dismiss hp the way Joseph chooses to
do. For now, anyway.

 

the way i understand it, the number advertised is "peak", which is the
most the head unit will put out, and often lasts a millisecond. if i
turn my blaupunkt all the way up, it sounds crappy. the speakers can
handle the wattage (40x4) but the head unit strains to deliver. i need
an amp...

but what to get? 2 channel or 4 channel?

 

http://www.pumaracing.co.uk/topspeed.htm
Extremely accurate calculations, I've verified them against various
FWD cars.

 

Nice!

Thanks.