• Nov 7th 2007 at 11:29AM
  • 23
There is awesomeness to the prefix "twin-turbo." It could be a Briggs & Stratton Vanguard engine (awesome in its own right) that you're talking about, but prepending any engine designation with the modifier "twin-turbo" can suck all of the air out of a room. Owners of lesser cars just nod in acknowledgment of their inferiority. Audi fans have lamented the evolution of the S4 from a twin-turbocharged V6 in the B5 version to V8 power for the two most recent iterations. Many feel that the V8 powerplant doesn't have the addictive frenetic nature of the old S4. For the next generation, Audi is returning the S4 to its roots as a more refined version of what you'll find in the Evo or the STi. The B8 S4 has reportedly been lapping the Nurburgring with a force-fed six-shooter underhood.

With the A5/S5 joining the lineup, the S4 doesn't have to worry as much about serving customers who'd rather have a GT than something more serious. Thus, an artificially-aspirated V6 displacing three liters and employing VW/Audi Group's FSI direct-injection technology and Audi's Valvelift actuation system can be parked in the S4 without fears that the hardcore nature of such a powerplant would be off-putting. Whether the external compressors are turbos or a supercharger is the subject of rumor. Also open to speculation is the horsepower output, but it'd be safe to bet that something slightly higher than the 300 HP packed into the BMW 335 can be expected. Also expect the S4 to employ Audi's Sport Differential to offer tweakable chassis attitude, as well as the obligatory styling tweaks and sumptuous cabin, too. Click the Read link below to view a couple renderings of what the next S4 might look like courtesy of Fourtitude.

[Source: Fourtitude, Rendering: Fourtitude]

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    • 1 Second Ago
      • 7 Years Ago
      All the non- automobile educated people, talking about turbo lag, and engine response, makes me want to beat my head against the wall.

      I am still trying to understand how people correlate throttle position and turbo lag in your head. Its all in your head, its not in the engine.

      A turbo engine is just like a normally aspirated engine, until it goes positive, then its that much better than normally aspirated. The extra power you feel, is because more power is being produced. If there were no turbo, you would call it linear.
      • 7 Years Ago
      I LOVE my B5 S4, and an updated version is going to be a must have for me. Plus I really like the new styling, if it looks anything like the rendering shown. Being able to squeeze 40HP just through a chip is unobtainable from a NA engine.
      • 7 Years Ago
      I'm all for going back to the twin turbo V6 format. As much as the big grumbling V8 in the B6/B7 S4 is impressive, it was a big gas guzzler, especially when you put the lead foot down. From a tuner's perspective, the forced induction route is the way to go.
      Look at the current E90/92 335 vs. the E46 M3. With just a software upgrade, these 335s are keeping up with, if not smoking stock E46 M3's! Same with the older B5 S4's like mine. I'm Stg 2+(exhaust, chip, DPs). I can smoke stock B6/B7 V8 S4's. And I'm sorry to say, when you go b00st, you never go back! ;)
      Hail to Audi for bringing back the forced induction in the S4!!! (now let's hope they move the motor back a bit to improve weight distribution!)
        • 7 Years Ago
        Yeah but the new block is too soft, and people are already blowing motors with nothing but Vishnu software, exhaust and race gas. The 335i motor sucks for tuning, unless you take the risk. The iron block in the E46 M3 however... let's just say you can keep the bottom end stock and attach a Horsepowerfreaks turbo kit to it and generate 600+ wheel horsepower all day long...

        How is that for tuner perspective... Sure, not everyone can afford a 12,000$ turbo kit, but we're talking about a BMW M3, poor people need not apply.
      • 7 Years Ago
      Well lets hope they get it a bit better this time around... the 2.7t engine was notorious for seeing turbos off, a friend of mine went through 3 sets. Yes, chipping doesn't help matters at all, but that is a sad defense that should be anticipated by engineers from the start. I sold a B6 S4 Avant 6m a year ago, but I was very happy with its engine; it was refined and the torque was eager to pull in 6th. There is no shortage of frantic cars in the world, lets hope the twin turbo setup is similar to that of BMW's.
      • 7 Years Ago
      All else held equal, most people would prefer a naturally aspirated engine over a turbocharged powerplant. That said, just in terms of the model line, it makes sense for Audi to better define the models. The S4 should have a V6, the S6 a V8, and the flagship S8, a V10. Now, with a V8 in the S4, and V10s in both the S6 and S8, it's all messed up.
      • 7 Years Ago
      a 1.8T with a software upgrade (revo technik) and its a different animal !!
        • 7 Years Ago
        Your not kidding there. Monster torque steer.
        • 7 Years Ago
        Yeah, keep BOTH hands on the wheel!
      • 7 Years Ago
      Great move by Audi! I have a B5 S4 and it's the best car I've ever owned. Refinement, low-end torque, good gas mileage, and it's easy to get power out of. I live at 6300 ft. in the Denver area. N/A V8s really suffer from the altitude and get horrible gas mileage. I'm pushing around 310 crank horsepower with a chip/exhaust and I still get 23-24 mixed driving and recently got 28 mpg on an all highway trip.
      • 7 Years Ago
      hmm that sounds strange...
      they have already lunched the S5 which shares the same chassie as the B8 A4/S4...with a 350hp 4.2l V8... why should they go a step back to a V6 TT?

      at WCF they have spy shoots of the new S4 driving around in Ingolstadt there they talk about the 4.2l V8 from the S5


      • 7 Years Ago
      Naturally aspirated is better (sounds like pontiac's 'wider is better')
      I just drove the Audi S5 (349hp) at Audi driver's experience (for free)
      3rd gear was plenty for the follow-the-leader exercise, plenty of pull from 3500-7000. The rev limiter in 3rd gear must be the close the throttle kind (holding 7000) instead of fuel cut kind. (good idea at over 90mph)
      Audi still needs to move the axle under the engine. Comparing an S5 to an RS4, the front axle is moved only 2" relative to the back of the engine.

      So if Audi did that, they could then increase bore spacing. 100mm for a V6 (95mm bore x 94mm stroke, 4 liters 350hp 325ft-lbs
      95mm for a V8 (90mm bore x 94mm stroke, 4.8 liters 400hp, 375ft-lbs)
      • 7 Years Ago
      Except that S4's are around 50-55k and 335 is under 40k. Sedan to Sedan. The A4 should have an engine to compete with the TT I6 from BMW. The existing 3.2 V6 just doesn't have the muscle.
      • 7 Years Ago
      I only detected lag in my 1.8T GTI when I drove like an old man, and even then it wasn't much. What's the deal with all you people saying there is turbo lag in that motor? Just drive the damn car, already.
      I like the move for Audi. Why did the S4 move to a V8 anyway? They should have simply reserved that for the RS4 and kept up development on the twin-turbo.
      Anyone can post anything they want about "lag-this," "still too much weight and complexity that," but the proof will be when the car debuts and we see results from believable sources.
      Or just drive the damn thing ourselves.
      • 7 Years Ago
      am i the only person who is not a fan of turbos? I would much rather a car with a smoother more linear pull from a N/A or supercharged engine.

      Granted, i've never driven a B5 S4 so maybe their engine doesn't suffer from turbo lag, but the turbo cars i have driven (VW 1.8T Wolfsburg and SAAB Viggen) were very annoying.
        • 7 Years Ago
        "Granted, i've never driven a B5 S4"

        You needn't say more. Go drive a chipped one and THEN tell me how you really feel! :)
        • 7 Years Ago
        haha, i have a 1.8t a4 and the power delivery is completely different from the b5 s4. the twin-turbo has no lag whatsoever. it's power throughout the entire powerband.

        not to mention the aftermarket capabilities are through the roof with turbos compared to NA. plus, it's lighter than a higher displacement equivalent.

        i've driven a B5 S4, and trust me, turbo lag doesnt exist. go drive a 335i as well. same thing, you can barely feel the lag.
        • 7 Years Ago
        I have driven a B5 S4, and compared to my N/A 350Z it was faster but the power delivery was nowhere near as smooth. Turbo lag was noticeable. The 2.0T GTI I drove was much smoother in terms of torque-delivery.

        Regardless, Audi isn't likely to regress so I look forward to this being an impressive engine setup in the new S4/S5.
        • 7 Years Ago
        The B5 S4 was a 2.7 litre V6 with twin turbo's. Very different than a 1.8 or 2.0 litre 4 banger with 1 turbo.
        the B5 S4 was a beast!

        With that said, I do prefer more n/a engines as well. They feel more raw to me. I guess this is the reason why'd i'd rather have a 997 GT3 over a 997 Turbo.
        • 7 Years Ago
        BKadalur wrote: "plus, it's lighter than a higher displacement equivalent."

        Except the 4.2L V8 that replaced it, weighs less...
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