Skip to main content

Next Audi S4 to debut at 2015 Frankfurt Motor Show?

2015 Audi S4
Image used with permission by copyright holder
We’ve already seen the next-generation Audi A4, and are hoping the sporty RS 4 model will finally return to the U.S., but what about the middle-child S4?

For the past few years, the S4 has been the sportiest A4 variant sold by Audi in the U.S., and like the rest of the lineup, it’s getting redesigned. The new model will likely debut alongside the standard A4 at the 2015 Frankfurt Motor Show, and could feature a very interesting powertrain.

That powertrain could include the first production application of the electric turbocharger Audi has been hinting at for the past several months, according to Auto Zeitung. That means the current model’s 3.0-liter supercharged V6 powertrain would be kaput.

The electric turbo will also reportedly be harnessed to a 3.0-liter V6 to produce around 348 horsepower, which is a notable upgrade over the current car’s 333 hp. Naturally, Audi’s quattro all-wheel drive system will be standard.

Turbochargers typically use exhaust gases to drive a fan that pulls more air into the engine, allowing for more combustion. However, an electric turbo uses an electric motor to spin the fan, which should make it more responsive.

Traditional turbochargers come with turbo lag, the delay caused by the need to build up enough exhaust-gas pressure to get the turbine spinning at the necessary speed. There’s no waiting with an electric motor, though, meaning the extra power provided by the turbo is available lower in the rev range, where it’s more useful.

Audi first demonstrated electric turbocharging in a modified RS 5, which had its 4.2-liter V8 swapped for a 3.0-liter diesel V6. In that prototype, a small electric turbocharger was teamed with a larger, conventional one. The small turbo was used to provide power at lower revs, and was bypassed at higher engine speeds. It’s possible Audi will use a similar setup in production.

It was originally thought that the first production Audi to get an electric turbocharger would be the SQ7, a rumored performance version of the redesigned 2016 Q7 SUV. While it’s hard to sneer at a fast vehicle that can seat seven, the S4 has already proven itself as a driver’s car, so perhaps it will be a better platform to debut this technology.

Editors' Recommendations

Stephen Edelstein
Stephen is a freelance automotive journalist covering all things cars. He likes anything with four wheels, from classic cars…
Mercedes-Benz will introduce something electric at the 2019 Frankfurt show
2019 mercedes benz eqs concept previews electric luxury sedan vision  iaa



Read more
The 2019 Audi A4 gets a noticeable face-lift, and adds hybrid power
2019 audi a4 europe 2020

Audi last tweaked the design of the A4 a year ago, making mild changes to the exterior. Those changes only lasted a year, as the German automaker released details on Tuesday, May 14, of a much larger change to its popular luxury sedan, both inside and out.

The most noticeable changes, like last time, are on the front end. The trademark single-frame grille is again redesigned; it's now much flatter and wider. Revised headlights remove the odd lower inside notch, and the lower outer grilles are shrunk quite a bit to make room for the more robust center one.

Read more
The Audi AI:me concept shows how a self-driving city car can fight boredom
Audi AI:ME concept



Read more