what is this intake system?!

[amalventano1@comcast.net (Allyn)]

quoting another source:
Tuned-Port Injection-This manifold was introduced by automakers in the mid
1980's and millions of them remain on the road today. It represents the
first massproduced
induction system that clearly incorporates modern wave-dynamic principals.
To optimize low-speed torque and fuel efficiency, the TPI manifold has very
long runners (many configurations measure up to 24-inches from valve head to
airbox). The runners on most TPI systems are also quite small in
diameter-again,
to optimize low-speed power.
(end quote)

so...
- the advantage is that the volumetric efficiency can actually reach values
greater than 1 in the tuned range (kinda like getting boost for free).
- the disadvnatege to these things is once you get past the peak, the torque
curve falls off more rapidly than without tuned port (since its effectively
detuned).

the runners on that oettinger intake look very small. im guessing its tuned
for the 6000 rpm range (as opposed to the average tuned port intake which
would be optimized for low end torque).

Al

Allyn Malventano, ETC(SS), USN
87 Rieger GTO Scirocco 16v (daily driver, 170k, rocco #6)
86 Kamei Twin 16V Turbo Scirocco GTX ('it has begun', rocco #7)
87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0 rattles, original clutch,
driveshafts, wheels :)


----- Original Message -----
From: "Scott F. Williams" <sfwilliams@comcast.net>
To: "Allyn" <amalventano1@comcast.net>
Cc: "Scirocco List" <scirocco-l@scirocco.org>
Sent: Sunday, May 26, 2002 12:54 PM
Subject: RE: what is this intake system?!


> > throttle response may be laggy, but that manifold probably has
> > one hell of a
> > tuned range (where it would flow MORE air than individual
> > throttle bodies).
> > Al
>
> Substantiate that claim, Allyn!
> --
> Scott F. Williams
> NJ Scirocco nut
> '99 Subaru Impreza 2.5 RS
> Mazda 323 GTX turbo "assaulted" vehicle
> Golf GTI 16v "rollycar"
> ClubVAC: "Roads found. Drivers wanted."
>