[BiturboS4] S4 Biturbo Torque and Power Curve?

[Newman, Christopher]

About a month ago, Ti Kan referenced the below link, which shows the
Horsepower and Torque
graph from the US-spec S4 brochure.

http://www.ibiblio.org/tkan/audi/autiq/2.7t-graph.gif


My understanding was that Horsepower = Torque multiplied by RPM divided by
5,252.
Therefore, Horsepower and Torque should equal each other at 5,252 RPM.
In other words, the Horsepower and Torque curves should intersect at 5,252.
Yet on Audi's graph, the curves intersect at a little over 4,000.
Am I missing something ?  Thanks for any comments.


> -----Original Message-----
> From:	Ti Kan [SMTP:ti at amb.org]
> Sent:	Monday, September 22, 2003 4:12 PM
> To:	andy at palomar.demon.co.uk
> Cc:	BiturboS4 at audifans.com
> Subject:	Re: [BiturboS4] S4 Biturbo Torque and Power Curve?
>
> Andy Turner writes:
> > On Mon, 22 Sep 2003 11:57:10 -0700, you wrote:
> > >I seem to remember that it was in the 2000 (maybe 2001) S4 brochure.
> > >Sometimes people scan in the brochures and make them available online,
> but
> > >I'm not sure if there are S4 brochures online anywhere.
> >
> > That's what I thought, but I've got a number of A4 and S4 brochures,
> > price lists and such like for the year, and I've looked through them -
> > but there isn't the diagram. There's one in the new 4.2 S4 brochure,
> > which kinda caught my eye because although it has a high peak power,
> > the power curve seems very steep and it has much less power at lower
> > revs. I was wondering how this compares to the BiTurbo S4, and what
> > the average BHP per revs for them both was. It might explain how a
> > 265bhp and a 340bhp engine can produce very similar 0-60 times.
>
> Audi's 0-60 published times are quite conservative.
> Most car reviews so far have been able to get about 0.5 second
> quicker 0-60 with the new V8 S4 than the biturbo S4.  While that
> might not seem like a lot but it does take quite a bit more power
> to get 5 sec than 5.5 sec.  The new model weighs more (not from
> the engine, but from the car overall), and the torque peak is
> achieved higher in the rpm band, so that also accounts for this
> too.
>
> What's interesting is that once underway, the V8 S4's midrange
> acceleration in top gear (say, from 50-80) is *a lot* quicker.
>
> Anyway, I have a horsepower and torque graph of the US-spec 2.7T
> engine on my S4 page:
> 	http://www.amb.org/ti/audi/autiq
> This is taken from the official Audi brochure.
>
> -Ti
>