[BiturboS4] Rumor(s) Behind The New S4

[Reznik Stan]

Chip,

To your forced induction point...i would tend to disagree. Yes you can
supercharge or even turbocharge the V8, but in the case of the new S4 --
"Houston we have a problem". Nameley it's the 11:1 compression ratio on
that motor. Have you ever seen a superchared E46 M3? Ever wonder why? In
order to make boost happen on this motor you'll have to replace the rods
and pistons, as well as modify the cams. Otherwise you're in severe
detonation land... To this point take a look at the 4.2 liter in the rs6
with its 9.2:1 compression ratio. So without MAJOR work the new s4 will
not be going anywhere near as fast as stage 3 cars we have right now.



> -----Original Message-----
> From: Chip Goetzinger [mailto:chip at auguricorp.com]
> Sent: Thursday, September 26, 2002 11:43 AM
> To: biturbos4 at audifans.com
> Subject: RE: [BiturboS4] Rumor(s) Behind The New S4
>
> One point you anti-V8 folks seem to keep making is that the 2.7TT is a
> superior engine to the V8 because you can add more boost, upgrade
turbos
> etc.  I would like to posit the opposing viewpoint which is this:  a
V8 IS
> in many ways a superior performance engine to a V6TT.  Why?  First, if
you
> are really into performance and do things like open-tracking
(particularly
> in warm environments), a N/A vehicle is far more reliable and
consistent
> than a TT vehicle.  Turbos run quite hot, and this heat must be
dissipated
> to keep the car performing well.  N/A V8s don't "heat soak" the way
turbo
> cars do.  V8s don't require the careful care that turbos do in terms
of
> cooldown after a run.  V8s don't blow turbos.  Simply, given the same
> power
> output, a 4.2L engine is just far less stressed than a 2.7L engine,
and
> the
> components will live longer.
>
> In power terms, sure, you can chip a V6TT and get some quick boost
gain -
> but at that point you've merely caught up with the V8 (and probably
have
> better TQ).  However, a V8 has no turbo lag, no non-linear throttle
> response
> to upset you in a corner, and no off-boost soft spots, nor does it
slow
> down
> as the day progresses due to heat-soaked intercoolers. V8s can be
modified
> too, and then what does the V6TT owner do?  More boost?  Bigger
turbos?
> Should you be one of those folks who wants LOTS of performance (like a
K04
> type in the turbo world), you can ADD forced induction to a V8 (for
> roughly
> the same price as a turbo upgrade on the V6TT).  Ask me how I know.
;o)
> At
> this point, you will have a forced V8 competing with a forced V6, and
the
> advantage is clear.  Simply put, you can add boost to anything, but
it's
> much harder to add displacement and impossible to add cylinders.
>
> So - my point is that when talking V8 vs V6TT performance, I know we
all
> love our 2.7TTs, but that doesn't mean there aren't advantages to a
V8.
> Stock vs. stock, the V8 wins.  As you add mod dollars, the V6TT is
> initially
> more attractive, since you can gain boost quickly with a chip etc.
> (remember, though, that much of that quick gain is simply catching up
to
> the
> V8s stock performance), but once you get to the limit of the stock
turbos
> (which is not very far past the stock V8 performance), the advantage
> quickly
> goes back to the V8, and the V8 has the higher ultimate power
capability
> simply due to size (see RS6).
>
> --Chip
> '96 Mustang Cobra Convertible - 435 RWHP (Laser Red, Saddle, Saddle -
> shhh,
> it's sleeping)
> '02 Audi S4 6-speed (Santorin/Onyx/Silver Alcantara sport)
> '02 Nissan Xterra XE-SC 4x4 AT (Black)
>
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