XR6 Typhoon Not That Fast

[Albert]

Was reading the latest Motor mag and it tests the new XR6 Typhoon.

Well after all the recent press about how fast this car is, and Ford would
not publish its performance times, as it would scare road safety critics,
and stuff that it was quicker than a Lambo, and a fraction slower than a 1.4
million dollar Porsche.

Well going by the Motor tests.
A Subaru Wrx matches it over the 400, and is a fraction slower in the 0 to
100 k dash, and I mean a fraction.

The Subaru WRX Sti Version kills it, in 0 to 100, and the 400 metres.

So what what all the hype about ?

[Marco]

"Albert" <bigal@hotmail.com> wrote in message
news:41943409$1@dnews.tpgi.com.au...
>
> The Subaru WRX Sti Version kills it, in 0 to 100, and the 400 metres.
>
> So what what all the hype about ?

Cunning marketing play. "The car so fast we don't want to publish the times
in case we get into trouble". Think about it.

[TheTaipan]

I think all of the talk was about its torque... with 550Nm it has a pretty
torquey engine - more so than the Gallardo and HSV's 6L V8... The whole not
publishing acceleration times I'm sure is just a clever marketing ploy in
response to that dickhead from the pedestrian council...


"Albert" <bigal@hotmail.com> wrote in message
news:41943409$1@dnews.tpgi.com.au...
> Was reading the latest Motor mag and it tests the new XR6 Typhoon.
>
> Well after all the recent press about how fast this car is, and Ford would
> not publish its performance times, as it would scare road safety critics,
> and stuff that it was quicker than a Lambo, and a fraction slower than a
> 1.4
> million dollar Porsche.
>
> Well going by the Motor tests.
> A Subaru Wrx matches it over the 400, and is a fraction slower in the 0 to
> 100 k dash, and I mean a fraction.
>
> The Subaru WRX Sti Version kills it, in 0 to 100, and the 400 metres.
>
> So what what all the hype about ?
>
>
>

[FuTAnT]

I thought acceleration times would be great ... means you can work out how
fast you can escape from a hit n run ....


Cam

[a9x5l]

ET = cbrt(car->weight / car->horsepower) * 5.825

All the bullshit in the world doesn't change that!

--
a9x5l

[Graham W]

a9x5l wrote:

> ET = cbrt(car->weight / car->horsepower) * 5.825
>
> All the bullshit in the world doesn't change that!

Where did you get this bullshit from?

That's an approximation based on a lot of assumptions.

Maximum horsepower, at a particular engine speed, doesn't tell you what
the power at other engine speeds is, or what the gearbox ratios are. A
very peaky motor with a 2 speed powerglide auto isn't going to do as
well as the same motor with a CVT transmission which can keep it at
maximum power.

Your approximation makes no provision for drag. A Falcon cab chassis
with a large van body is clearly going to have far more drag than a
mechanically identical Falcon sedan ballasted to the same mass.

Like the van body, drag at higher speeds is more important than mass for
a motorcycle, whereas mass, not drag, is the critical factor for a semi
or B double.

Lots of different factors will change your approximation, which looks
oh-so-precise with that 4 decimal place fudge factor of 5.825. But thats
all it is, a fudge factor to make the formula best fit a bunch of data
points from typical cars.

Most petrol motors have essentially similar torque-speed curves. Most
cars have fairly similar drag characteristics. Most car manufacturers
provide gearbox ratios which will keep the engine within the top 25% of
the rev range. For most conventional cars, your approximation probably
works well, but it's only an approximation.

[a9x5l]

On Sat, 13 Nov 2004 10:39:19 +1100, Graham W wrote:

> a9x5l wrote:
>
>> ET = cbrt(car->weight / car->horsepower) * 5.825
>>
>> All the bullshit in the world doesn't change that!
>
> Where did you get this bullshit from?
>
> That's an approximation based on a lot of assumptions.
>
> Maximum horsepower, at a particular engine speed, doesn't tell you what
> the power at other engine speeds is, or what the gearbox ratios are. A
> very peaky motor with a 2 speed powerglide auto isn't going to do as well
> as the same motor with a CVT transmission which can keep it at maximum
> power.
>
> Your approximation makes no provision for drag. A Falcon cab chassis with
> a large van body is clearly going to have far more drag than a
> mechanically identical Falcon sedan ballasted to the same mass.
>
> Like the van body, drag at higher speeds is more important than mass for a
> motorcycle, whereas mass, not drag, is the critical factor for a semi or B
> double.
>
> Lots of different factors will change your approximation, which looks
> oh-so-precise with that 4 decimal place fudge factor of 5.825. But thats
> all it is, a fudge factor to make the formula best fit a bunch of data
> points from typical cars.
>
> Most petrol motors have essentially similar torque-speed curves. Most cars
> have fairly similar drag characteristics. Most car manufacturers provide
> gearbox ratios which will keep the engine within the top 25% of the rev
> range. For most conventional cars, your approximation probably works well,
> but it's only an approximation.

The formula was written by Patrick Hale - author of the Quarter Jnr
program, if you're into drag racing, you'll know of this program.

Of course the formula doesn't allow for variables such as body style,
transmission, gearing, etc, etc, but it is said to be within 4% of actual
testing, if you need precise accuracy, buy the program!

A similar formula can be used for determining MPH:

MPH = cbrt(car->horsepower / car->weight) * 234



--
a9x5l

[a9x5l]

Some links with info:

http://www.stealth316.com/2-calc-hp-et-mph.htm

http://www.quarterjr.com/

--
a9x5l

[NIX8860]

or you could try cartest 4.5 Dos version

http://www.cartestsoftware.com/


"a9x5l" <a9x5l@hotmail.com> wrote in message
news:pan.2004.11.13.00.58.52.239086@hotmail.com...
> Some links with info:
>
> http://www.stealth316.com/2-calc-hp-et-mph.htm
>
> http://www.quarterjr.com/
>
> --
> a9x5l
>

[Fraser Johnston]

"NIX8860" <nobody@nowhere.net.au> wrote in message
news:cn48ce$1a4$1@news-02.connect.com.au...
> or you could try cartest 4.5 Dos version
>
> http://www.cartestsoftware.com/
>

Or you could nip down to the track. And when the clutch drops the bullshit
stops.

Fraser