PJS4

Why is the s4 called a biturbo instead of twin turbo?

larryV

<p><img src="http://pictureposter.audiworld.com/AudiWorldPics/2000/larryvsig2.jpg">

S-Curve

A biturbo is one turbo dedicated to each bank of cylinders (half of the V). A twin turbo is two turbochargers for all cylinders. Usually in twin turbo setups, you have one turbo (somewhat small) that kicks in at low RPMs and then a bigger one that kicks in at mid revs. Still, you have 2 turbos pushing all cylinders. In biturbo setups, each turbo pushes one-half of the cylinders. Make sense?

doctorb

<p>Cheng.Kwan
Stg2 S4
Founder of the HIG consortium.
"Not only am i the president, i'm also a client"

SKS

Nope...It's just European slang for twin turbo, means the same thing.

BenM@University Audi

Cause they go bi-directional, they spin backwards when you go in reverse, haha

Oscar

Also, they wanted to keep the Italian word, just like Quattro. (Remember the Maserati Biturbo?)

Ron O

<p>S4 Tip,Alcan,Silver,CD,
MM Spyders,APR,Winter,
Garmin Street Pilot
Born 11.18.99

David

And only knowledgeable autofiles know what it is!<p>David
Silver/Onyx-Silver
<a href="http://registry.audiworld.com/audi/registry/details.asp?car=3683"><img src="http://pictureposter.audiworld.com/AudiWorldPics/2000/dnrsmall.jpg"></a>
GIAC II & Race Tip chips

Oscar

Yeap!!